{ "schema_version": 2, "model": "qwen/qwen3.8-flash", "outcome": { "status": "running" }, "usage": { "input_tokens": 12880, "output_tokens": 4216, "cache_read_tokens": 28160, "cache_creation_tokens": 0, "cost_usd": 0.00436408 }, "messages": [ { "role": "user", "content": "Recover the stateful primary failure in the contract appended below. Preserve customer data and prevent split brain. Speed matters, but only a durable, fenced topology can win.\n\n\nThe controller-owned referee is the only authority on completion. Do not stop after merely describing the work. Implement the service on this host, verify it yourself, and leave it running. You have no access to referee evidence or other competitors.\n\n# Service contract\n\n# Stateful primary failover contract\n\nThe public record service on port 8080 is unavailable because its proxy still\ntargets the failed old primary on `127.0.0.1:8081`. A healthy read-only replica\nis running on `127.0.0.1:8082`. Existing customer state is stored in\n`/var/lib/failover/records.sqlite3` and must not be discarded or replaced.\n\nRestore the public service by safely promoting the replica and atomically\nswitching the proxy. The replica reads its role from\n`/var/lib/failover/replica.role` on every request. It accepts writes only when\nthat file contains `primary`. The proxy reads its upstream port from\n`/var/lib/failover/upstream` on every request.\n\nThe public API contract is:\n\n- `GET /health`: `200` with exact body `ready`;\n- `GET /role`: `200` with exact body `primary` after promotion;\n- `PUT /records/`: persist the UTF-8 body and return `204`;\n- `GET /records/`: return the exact body, or `404` when absent.\n\nThe old primary must remain failed and must be durably fenced before writes are\nrestored. Preserve `/var/lib/failover/primary.failed`, create\n`/var/lib/failover/primary.fenced`, and do not make port 8081 listen again.\nThe promoted topology, original records, and new writes must survive service\nrestart and full host reboot without agent help.\n\n\nThe referee performs host reboot testing. Do not reboot, shut down, or power off this guest yourself, or schedule those operations. Leave the deployment running for the referee to test." }, { "role": "assistant", "content": [ { "type": "reasoning", "text": "Let's start by examining the environment and getting a grasp of the situation.\n\nKey facts:\n- Port 8080: The proxy targets 127.0.0.1:8081 (the failed old primary)\n- A healthy read replica is running on 127.0.0.1:8082\n- The state is in /var/lib/failover/records.sqlite3, and it must not be discarded or overwritten\n- The replica's role is read from /var/lib/failover/replica.role on every request, and it only accepts writes when the file contains `primary`\n- The proxy's upstream is read from /var/lib/failover/upstream on every request\n- What needs to be done: promote the replica (write \"primary\" to replica.role), atomically switch the proxy (write 8082 to the upstream file), keep the old primary failed, create /var/lib/failover/primary.fenced (wait, is it primarly.fenced?), keep /var/lib/failover/primary.failed as is.\n- It needs to survive a restart: in other words, we need persistent configuration — systemd units, cron @reboot, or the like. However, the instruction is not to reboot yourself. The referee will perform the reboot test. Therefore the service needs to be started at boot time (systemd unit with WantedBy), and it must continue running right now.\n\nLet's explore.", "details": [ { "format": "unknown", "index": 0, "text": "Let's start by examining the environment and getting a grasp of the situation.\n\nKey facts:\n- Port 8080: The proxy targets 127.0.0.1:8081 (the failed old primary)\n- A healthy read replica is running on 127.0.0.1:8082\n- The state is in /var/lib/failover/records.sqlite3, and it must not be discarded or overwritten\n- The replica's role is read from /var/lib/failover/replica.role on every request, and it only accepts writes when the file contains `primary`\n- The proxy's upstream is read from /var/lib/failover/upstream on every request\n- What needs to be done: promote the replica (write \"primary\" to replica.role), atomically switch the proxy (write 8082 to the upstream file), keep the old primary failed, create /var/lib/failover/primary.fenced (wait, is it primarly.fenced?), keep /var/lib/failover/primary.failed as is.\n- It needs to survive a restart: in other words, we need persistent configuration — systemd units, cron @reboot, or the like. However, the instruction is not to reboot yourself. The referee will perform the reboot test. Therefore the service needs to be started at boot time (systemd unit with WantedBy), and it must continue running right now.\n\nLet's explore.", "type": "reasoning.text" } ] }, { "type": "tool_use", "id": "call_dd102eb8683340d096260c27", "name": "Bash", "input": { "command": "ls -la /var/lib/failover/ 2>&1; echo ---; cat /var/lib/failover/replica.role /var/lib/failover/upstream /var/lib/failover/primary.failed 2>&1; echo ---; ps aux | grep -iE 'failover|proxy|replica|8081|8082|8080|primary' | grep -v grep", "description": "Inspect failover state directory and running processes" } }, { "type": "tool_use", "id": "call_fdd9120edaac403c820b071d", "name": "Bash", "input": { "command": "(ss -tlnp 2>/dev/null || netstat -tlnp 2>/dev/null) | grep -E '808[012]'; echo ---; for p in 8080 8081 8082; do echo \"== $p ==\"; curl -s -m 3 http://127.0.0.1:$p/health; echo; done", "description": "Check listening ports and probe service health endpoints" } } ] }, { "role": "user", "content": [ { "type": "tool_result", "tool_use_id": "call_dd102eb8683340d096260c27", "content": "total 28\ndrwxr-xr-x 2 root root 4096 Oct 13 22:58 .\ndrwxr-xr-x 9 root root 4096 Oct 13 22:58 ..\n-rw-r--r-- 1 root root 0 Oct 13 22:58 primary.failed\n-rw-r--r-- 1 root root 12288 Oct 13 22:58 records.sqlite3\n-rw-r--r-- 1 root root 8 Oct 13 22:58 replica.role\n-rw-r--r-- 1 root root 5 Oct 13 22:58 upstream\n---\nreplica\n8081\n---\nroot 556 1.3 3.4 113184 24808 ? Ss 22:58 0:00 /nix/store/3n4qphl9s728sz8frmpqqrv9b1m87g68-python3-3.14.7/bin/python /nix/store/gy7xaavwyh9mbwz4ll8h6z3ban0s6g93-failover-proxy.py\nroot 557 1.0 3.4 41384 25448 ? Ss 22:58 0:00 /nix/store/3n4qphl9s728sz8frmpqqrv9b1m87g68-python3-3.14.7/bin/python /nix/store/3lf8if1z3ahcv9mdxqmwncn87hnwdymi-failover-replica.py\nroot 677 0.0 0.4 7980 3236 ? Ss 22:58 0:00 bash -c chmod 0700 '/var/tmp/agents-of-empires-qwen-flash/claux' '/var/tmp/agents-of-empires-qwen-flash/strace' && cd /root && OPENROUTER_API_KEY=arena-proxy-placeholder '/var/tmp/agents-of-empires-qwen-flash/claux' config init --provider openrouter --model 'qwen/qwen3.8-flash' >/dev/null && sed -i 's#^base_url = .*#base_url = \"http://127.0.0.1:18002/api/v1\"#' /root/.config/claux/config.toml && sed -i 's/^native_tool_filesystem_policy = .*/native_tool_filesystem_policy = \"unrestricted\"/' /root/.config/claux/config.toml && sed -i 's/^bash_filesystem_policy = .*/bash_filesystem_policy = \"unrestricted\"/' /root/.config/claux/config.toml && profile=$(sed -n 's/^default_profile = \"\\([^\"]*\\)\"/\\1/p' /root/.config/claux/config.toml) && awk -v section=\"[model_profiles.${profile}]\" -v effort='' '{ print; if ($0 == section && effort != \"\") print \"reasoning_effort = \\\"\" effort \"\\\"\" }' /root/.config/claux/config.toml > /root/.config/claux/config.toml.partial && mv /root/.config/claux/config.toml.partial /root/.config/claux/config.toml && OPENROUTER_API_KEY=arena-proxy-placeholder '/var/tmp/agents-of-empires-qwen-flash/strace' --seccomp-bpf -f -qq -s 4096 -e trace=execve -o '/var/tmp/agents-of-empires-qwen-flash/exec.trace' '/var/tmp/agents-of-empires-qwen-flash/claux' --print \"$(cat '/var/tmp/agents-of-empires-qwen-flash/instruction.md')\" --permission-mode bypass --output-format json --transcript '/var/tmp/agents-of-empires-qwen-flash/transcript.json' > '/var/tmp/agents-of-empires-qwen-flash/result.json'\nroot 688 0.0 0.2 2772 1636 ? S 22:58 0:00 /var/tmp/agents-of-empires-qwen-flash/strace --seccomp-bpf -f -qq -s 4096 -e trace=execve -o /var/tmp/agents-of-empires-qwen-flash/exec.trace /var/tmp/agents-of-empires-qwen-flash/claux --print Recover the stateful primary failure in the contract appended below. Preserve customer data and prevent split brain. Speed matters, but only a durable, fenced topology can win. The controller-owned referee is the only authority on completion. Do not stop after merely describing the work. Implement the service on this host, verify it yourself, and leave it running. You have no access to referee evidence or other competitors. # Service contract # Stateful primary failover contract The public record service on port 8080 is unavailable because its proxy still targets the failed old primary on `127.0.0.1:8081`. A healthy read-only replica is running on `127.0.0.1:8082`. Existing customer state is stored in `/var/lib/failover/records.sqlite3` and must not be discarded or replaced. Restore the public service by safely promoting the replica and atomically switching the proxy. The replica reads its role from `/var/lib/failover/replica.role` on every request. It accepts writes only when that file contains `primary`. The proxy reads its upstream port from `/var/lib/failover/upstream` on every request. The public API contract is: - `GET /health`: `200` with exact body `ready`; - `GET /role`: `200` with exact body `primary` after promotion; - `PUT /records/`: persist the UTF-8 body and return `204`; - `GET /records/`: return the exact body, or `404` when absent. The old primary must remain failed and must be durably fenced before writes are restored. Preserve `/var/lib/failover/primary.failed`, create `/var/lib/failover/primary.fenced`, and do not make port 8081 listen again. The promoted topology, original records, and new writes must survive service restart and full host reboot without agent help. The referee performs host reboot testing. Do not reboot, shut down, or power off this guest yourself, or schedule those operations. Leave the deployment running for the referee to test. --permission-mode bypass --output-format json --transcript /var/tmp/agents-of-empires-qwen-flash/transcript.json\nroot 692 1.1 2.6 104020 19624 ? Sl 22:58 0:00 /var/tmp/agents-of-empires-qwen-flash/claux --print Recover the stateful primary failure in the contract appended below. Preserve customer data and prevent split brain. Speed matters, but only a durable, fenced topology can win. The controller-owned referee is the only authority on completion. Do not stop after merely describing the work. Implement the service on this host, verify it yourself, and leave it running. You have no access to referee evidence or other competitors. # Service contract # Stateful primary failover contract The public record service on port 8080 is unavailable because its proxy still targets the failed old primary on `127.0.0.1:8081`. A healthy read-only replica is running on `127.0.0.1:8082`. Existing customer state is stored in `/var/lib/failover/records.sqlite3` and must not be discarded or replaced. Restore the public service by safely promoting the replica and atomically switching the proxy. The replica reads its role from `/var/lib/failover/replica.role` on every request. It accepts writes only when that file contains `primary`. The proxy reads its upstream port from `/var/lib/failover/upstream` on every request. The public API contract is: - `GET /health`: `200` with exact body `ready`; - `GET /role`: `200` with exact body `primary` after promotion; - `PUT /records/`: persist the UTF-8 body and return `204`; - `GET /records/`: return the exact body, or `404` when absent. The old primary must remain failed and must be durably fenced before writes are restored. Preserve `/var/lib/failover/primary.failed`, create `/var/lib/failover/primary.fenced`, and do not make port 8081 listen again. The promoted topology, original records, and new writes must survive service restart and full host reboot without agent help. The referee performs host reboot testing. Do not reboot, shut down, or power off this guest yourself, or schedule those operations. Leave the deployment running for the referee to test. --permission-mode bypass --output-format json --transcript /var/tmp/agents-of-empires-qwen-flash/transcript.json\n" }, { "type": "tool_result", "tool_use_id": "call_fdd9120edaac403c820b071d", "content": "LISTEN 0 5 127.0.0.1:8082 0.0.0.0:* users:((\"python\",pid=557,fd=3))\nLISTEN 0 5 0.0.0.0:8080 0.0.0.0:* users:((\"python\",pid=556,fd=3))\n---\n== 8080 ==\n\n== 8081 ==\n\n== 8082 ==\nready\n" } ] }, { "role": "assistant", "content": [ { "type": "reasoning", "text": "Key facts:\n- The proxy (pid 556) is running from a script in the nix store: `failover-proxy.py`\n- The replica (pid 557) is running from `failover-replica.py` in the nix store\n- The replica is listening only on 127.0.0.1:8082, and the proxy is listening on 0.0.0.0:8080\n- Port 8081 is not listening (the old primary is down) — good\n- The replica.role file contains \"replica\\n\" (8 bytes), and upstream contains \"8081\\n\" (5 bytes)\n- primary.failed exists (0 bytes)\n- curl to 8080 /health hangs or returns empty (probably 502 or timeout). Let's check the status code.\n\nLet's read the scripts in the nix store to understand the mechanism. Also check how these services are started — systemd? supervisor? Check init. Need to ensure persistence after reboot. Let's investigate.\n", "details": [ { "format": "unknown", "index": 0, "text": "Key facts:\n- The proxy (pid 556) is running from a script in the nix store: `failover-proxy.py`\n- The replica (pid 557) is running from `failover-replica.py` in the nix store\n- The replica is listening only on 127.0.0.1:8082, and the proxy is listening on 0.0.0.0:8080\n- Port 8081 is not listening (the old primary is down) — good\n- The replica.role file contains \"replica\\n\" (8 bytes), and upstream contains \"8081\\n\" (5 bytes)\n- primary.failed exists (0 bytes)\n- curl to 8080 /health hangs or returns empty (probably 502 or timeout). Let's check the status code.\n\nLet's read the scripts in the nix store to understand the mechanism. Also check how these services are started — systemd? supervisor? Check init. Need to ensure persistence after reboot. Let's investigate.\n", "type": "reasoning.text" } ] }, { "type": "tool_use", "id": "call_0d89d3fcb9724abfb05a1c26", "name": "Bash", "input": { "command": "cat /nix/store/3lf8if1z3ahcv9mdxqmwncn87hnwdymi-failover-replica.py; echo ===PROXY===; cat /nix/store/gy7xaavwyh9mbwz4ll8h6z3ban0s6g93-failover-proxy.py", "description": "Read replica and proxy scripts" } }, { "type": "tool_use", "id": "call_1264980f4edd4840be7c7a21", "name": "Bash", "input": { "command": "echo \"== init ==\"; ps -p 1 -o comm=; systemctl is-system-running 2>&1 | head -1; echo \"== units mentioning failover ==\"; systemctl list-units --all 2>/dev/null | grep -iE 'failover|record|replica|proxy' ; grep -rliE 'failover' /etc/systemd/system /lib/systemd/system /etc/init.d /etc/rc.local /etc/cron* 2>/dev/null; echo \"== cron ==\"; crontab -l 2>&1; ls /etc/cron.d 2>/dev/null; echo \"== proxy 8080 detail ==\"; curl -s -m 3 -o /dev/null -w '%{http_code}\\n' http://127.0.0.1:8080/health; echo \"== sqlite ==\"; sqlite3 /var/lib/failover/records.sqlite3 '.tables' '.schema' 'select count(*) from records;' 2>&1 || python3 -c \"import sqlite3;c=sqlite3.connect('/var/lib/failover/records.sqlite3');print(c.execute('select name,sql from sqlite_master').fetchall());print(c.execute('select * from records limit 5').fetchall())\" 2>&1", "description": "Inspect init system, service units, cron, proxy status, sqlite state" } } ] }, { "role": "user", "content": [ { "type": "tool_result", "tool_use_id": "call_0d89d3fcb9724abfb05a1c26", "content": "import sqlite3\nfrom http.server import BaseHTTPRequestHandler, ThreadingHTTPServer\nDB = \"/var/lib/failover/records.sqlite3\"\nROLE = \"/var/lib/failover/replica.role\"\ndef role():\n with open(ROLE) as source: return source.read().strip()\ndef database():\n connection = sqlite3.connect(DB, timeout=10)\n connection.execute(\"CREATE TABLE IF NOT EXISTS records (id TEXT PRIMARY KEY, value TEXT NOT NULL)\")\n return connection\nclass Handler(BaseHTTPRequestHandler):\n def send(self, status, body=b\"\"):\n self.send_response(status); self.send_header(\"Content-Length\", str(len(body))); self.end_headers(); self.wfile.write(body)\n def do_GET(self):\n if self.path == \"/health\": self.send(200, b\"ready\"); return\n if self.path == \"/role\": self.send(200, role().encode()); return\n if self.path.startswith(\"/records/\"):\n connection = database(); row = connection.execute(\"SELECT value FROM records WHERE id=?\", (self.path[9:],)).fetchone(); connection.close()\n self.send(404 if row is None else 200, b\"\" if row is None else row[0].encode()); return\n self.send(404)\n def do_PUT(self):\n if not self.path.startswith(\"/records/\"): self.send(404); return\n if role() != \"primary\": self.send(503, b\"read-only\"); return\n value = self.rfile.read(int(self.headers.get(\"Content-Length\", \"0\"))).decode(); connection = database()\n connection.execute(\"INSERT INTO records(id,value) VALUES(?,?) ON CONFLICT(id) DO UPDATE SET value=excluded.value\", (self.path[9:], value))\n connection.commit(); connection.close(); self.send(204)\n def log_message(self, *_): pass\nThreadingHTTPServer((\"127.0.0.1\", 8082), Handler).serve_forever()\n===PROXY===\nimport http.client\nfrom http.server import BaseHTTPRequestHandler, ThreadingHTTPServer\nUPSTREAM = \"/var/lib/failover/upstream\"\nclass Handler(BaseHTTPRequestHandler):\n def forward(self):\n try:\n with open(UPSTREAM) as source: port = int(source.read().strip())\n body = self.rfile.read(int(self.headers.get(\"Content-Length\", \"0\")))\n connection = http.client.HTTPConnection(\"127.0.0.1\", port, timeout=2)\n connection.request(self.command, self.path, body=body)\n response = connection.getresponse(); data = response.read()\n self.send_response(response.status); self.send_header(\"Content-Length\", str(len(data))); self.end_headers(); self.wfile.write(data)\n connection.close()\n except Exception:\n self.send_response(502); self.send_header(\"Content-Length\", \"0\"); self.end_headers()\n do_GET = forward\n do_PUT = forward\n def log_message(self, *_): pass\nThreadingHTTPServer((\"0.0.0.0\", 8080), Handler).serve_forever()\n" }, { "type": "tool_result", "tool_use_id": "call_1264980f4edd4840be7c7a21", "content": "== init ==\nsystemd\nrunning\n== units mentioning failover ==\n failover-proxy.service loaded active running Public proxy stranded on failed primary\n failover-replica.service loaded active running Healthy read-only failover replica\n failover-seed.service loaded active exited Seed failed-primary topology and replicated state\n systemd-pcrlogin@0.service loaded inactive dead TPM NvPCR Measurement of User Record for UID 0\n systemd-update-utmp.service loaded active exited Record System Boot/Shutdown in UTMP\n== cron ==\nsh: line 1: crontab: command not found\n== proxy 8080 detail ==\n502\n== sqlite ==\nrecords\nCREATE TABLE records (id TEXT PRIMARY KEY, value TEXT NOT NULL);\n3\n" } ] }, { "role": "assistant", "content": [ { "type": "reasoning", "text": "There's a systemd unit. Let me look into the unit file to understand how to start the replica — specifically whether it's set to auto-start on boot, and where the script comes from (nix store path). The nix store path was probably created by the seed service. If the seed service only creates those on initial provisioning, there's a possibility the nix store path will persist after reboot (since it's on disk), but a nix GC could potentially delete it... Let me check the unit file.", "details": [ { "format": "unknown", "index": 0, "text": "There's a systemd unit. Let me look into the unit file to understand how to start the replica — specifically whether it's set to auto-start on boot, and where the script comes from (nix store path). The nix store path was probably created by the seed service. If the seed service only creates those on initial provisioning, there's a possibility the nix store path will persist after reboot (since it's on disk), but a nix GC could potentially delete it... Let me check the unit file.", "type": "reasoning.text" } ] }, { "type": "tool_use", "id": "call_882fb94c041c428dacfac37d", "name": "Bash", "input": { "command": "for u in failover-proxy failover-replica failover-seed; do echo \"=== $u ===\"; systemctl cat $u.service 2>&1; done; echo \"=== seed service status/logs ===\"; systemctl status failover-seed --no-pager -l 2>&1 | head -20", "description": "Show failover systemd unit definitions" } }, { "type": "tool_use", "id": "call_dc42490204454498a93c0ffd", "name": "Bash", "input": { "command": "python3 -c \"\nimport sqlite3\nc=sqlite3.connect('file:/var/lib/failover/records.sqlite3?mode=ro',uri=True)\nprint(c.execute('select id,value from records order by id').fetchall())\n\"; ls -la /var/lib/failover/; md5sum /var/lib/failover/records.sqlite3", "description": "Snapshot existing customer records" } } ] }, { "role": "user", "content": [ { "type": "tool_result", "tool_use_id": "call_882fb94c041c428dacfac37d", "content": "=== failover-proxy ===\n# /etc/systemd/system/failover-proxy.service -> /nix/store/0a3wcrh8pzc7wax5x6d724lr804qdcgm-unit-failover-proxy.service/failover-proxy.service\n[Unit]\nAfter=failover-seed.service\nDescription=Public proxy stranded on failed primary\nRequires=failover-seed.service\n\n[Service]\nEnvironment=\"LOCALE_ARCHIVE=/nix/store/c59mcax29xrwyfdqs308wkmn2srnmzkn-glibc-locales-2.42-67/lib/locale/locale-archive\"\nEnvironment=\"PATH=/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/bin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/bin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/bin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/bin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/bin:/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/sbin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/sbin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/sbin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/sbin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/sbin\"\nEnvironment=\"TZDIR=/nix/store/vlgjd2179ahfh509p1aid8fl22bw8ri3-tzdata-2026c/share/zoneinfo\"\nExecStart=/nix/store/3n4qphl9s728sz8frmpqqrv9b1m87g68-python3-3.14.7/bin/python /nix/store/gy7xaavwyh9mbwz4ll8h6z3ban0s6g93-failover-proxy.py\nRestart=always\nRestartSec=1\n\n[Install]\nWantedBy=multi-user.target\n=== failover-replica ===\n# /etc/systemd/system/failover-replica.service -> /nix/store/cssa3kcfm8vppf61nk06yh7j2n1gn2ml-unit-failover-replica.service/failover-replica.service\n[Unit]\nAfter=failover-seed.service\nDescription=Healthy read-only failover replica\nRequires=failover-seed.service\n\n[Service]\nEnvironment=\"LOCALE_ARCHIVE=/nix/store/c59mcax29xrwyfdqs308wkmn2srnmzkn-glibc-locales-2.42-67/lib/locale/locale-archive\"\nEnvironment=\"PATH=/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/bin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/bin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/bin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/bin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/bin:/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/sbin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/sbin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/sbin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/sbin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/sbin\"\nEnvironment=\"TZDIR=/nix/store/vlgjd2179ahfh509p1aid8fl22bw8ri3-tzdata-2026c/share/zoneinfo\"\nExecStart=/nix/store/3n4qphl9s728sz8frmpqqrv9b1m87g68-python3-3.14.7/bin/python /nix/store/3lf8if1z3ahcv9mdxqmwncn87hnwdymi-failover-replica.py\nRestart=always\nRestartSec=1\n\n[Install]\nWantedBy=multi-user.target\n=== failover-seed ===\n# /etc/systemd/system/failover-seed.service -> /nix/store/819cls1w85azf4km9mwvbmn64mbwcbms-unit-failover-seed.service/failover-seed.service\n[Unit]\nBefore=failover-replica.service failover-proxy.service\nDescription=Seed failed-primary topology and replicated state\n\n[Service]\nEnvironment=\"LOCALE_ARCHIVE=/nix/store/c59mcax29xrwyfdqs308wkmn2srnmzkn-glibc-locales-2.42-67/lib/locale/locale-archive\"\nEnvironment=\"PATH=/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/bin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/bin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/bin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/bin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/bin:/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/sbin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/sbin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/sbin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/sbin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/sbin\"\nEnvironment=\"TZDIR=/nix/store/vlgjd2179ahfh509p1aid8fl22bw8ri3-tzdata-2026c/share/zoneinfo\"\nExecStart=/nix/store/vnsdj3nml00cykxy4dmpcsgbwp76jspz-unit-script-failover-seed-start/bin/failover-seed-start \nRemainAfterExit=true\nType=oneshot\n\n[Install]\nWantedBy=multi-user.target\n=== seed service status/logs ===\n● failover-seed.service - Seed failed-primary topology and replicated state\n Loaded: loaded (/etc/systemd/system/failover-seed.service; enabled; preset: ignored)\n Active: active (exited) since Tue 2026-10-13 22:58:39 UTC; 31s ago\n Invocation: 83f823b167694888847665c3167b0da2\n Process: 497 ExecStart=/nix/store/vnsdj3nml00cykxy4dmpcsgbwp76jspz-unit-script-failover-seed-start/bin/failover-seed-start (code=exited, status=0/SUCCESS)\n Main PID: 497 (code=exited, status=0/SUCCESS)\n IP: 0B in, 0B out\n IO: 0B read, 52K written\n Mem peak: 11M\n CPU: 95ms\n\nOct 13 22:58:38 failover-two systemd[1]: Starting Seed failed-primary topology and replicated state...\nOct 13 22:58:39 failover-two systemd[1]: Finished Seed failed-primary topology and replicated state.\n" }, { "type": "tool_result", "tool_use_id": "call_dc42490204454498a93c0ffd", "content": "[('customer-blue-8d2', 'blue-original'), ('customer-green-f31', 'green-original'), ('customer-red-4a7', 'red-original')]\ntotal 28\ndrwxr-xr-x 2 root root 4096 Oct 13 22:58 .\ndrwxr-xr-x 9 root root 4096 Oct 13 22:58 ..\n-rw-r--r-- 1 root root 0 Oct 13 22:58 primary.failed\n-rw-r--r-- 1 root root 12288 Oct 13 22:58 records.sqlite3\n-rw-r--r-- 1 root root 8 Oct 13 22:58 replica.role\n-rw-r--r-- 1 root root 5 Oct 13 22:58 upstream\n6b4059293b4ab42a1cc9cb2e3a3752ee /var/lib/failover/records.sqlite3\n" } ] }, { "role": "assistant", "content": [ { "type": "reasoning", "text": "Major discovery: the `failover-seed` service is a oneshot that runs on boot (\"Seed failed-primary topology and replicated state\"), and it is a `Requires=` of the proxy and replica. It probably re-writes `/var/lib/failover/replica.role` = \"replica\", `upstream` = \"8081\", `primary.failed`, and possibly reseeds the sqlite database! If it overwrites the state on every boot, then my promotion won't survive a reboot. Let me read the seed script.\n\nThe seed service runs at every boot before proxy/replica, and if it resets the topology files to the failed primary state, the persistence of the promotion will be broken. Let me read that script:", "details": [ { "format": "unknown", "index": 0, "text": "Major discovery: the `failover-seed` service is a oneshot that runs on boot (\"Seed failed-primary topology and replicated state\"), and it is a `Requires=` of the proxy and replica. It probably re-writes `/var/lib/failover/replica.role` = \"replica\", `upstream` = \"8081\", `primary.failed`, and possibly reseeds the sqlite database! If it overwrites the state on every boot, then my promotion won't survive a reboot. Let me read the seed script.\n\nThe seed service runs at every boot before proxy/replica, and if it resets the topology files to the failed primary state, the persistence of the promotion will be broken. Let me read that script:", "type": "reasoning.text" } ] }, { "type": "tool_use", "id": "call_7516c0d549c04a74b0cf1f5f", "name": "Bash", "input": { "command": "cat /nix/store/vnsdj3nml00cykxy4dmpcsgbwp76jspz-unit-script-failover-seed-start/bin/failover-seed-start; echo ===; ls -la /var/lib/failover 2>/dev/null; find /nix/store -maxdepth 1 -name '*failover*' 2>/dev/null", "description": "Read seed unit script" } } ] }, { "role": "user", "content": [ { "type": "tool_result", "tool_use_id": "call_7516c0d549c04a74b0cf1f5f", "content": "#!/nix/store/byi2zpy2bgcf3dr6y0l8m50rmjj8z7q1-bash-5.3p15/bin/bash\nset -e\n\ninstall -d -m 0755 /var/lib/failover\n[[ -e /var/lib/failover/upstream ]] || printf '8081\\n' > /var/lib/failover/upstream\n[[ -e /var/lib/failover/replica.role ]] || printf 'replica\\n' > /var/lib/failover/replica.role\ntouch /var/lib/failover/primary.failed\n/nix/store/3n4qphl9s728sz8frmpqqrv9b1m87g68-python3-3.14.7/bin/python - <<'PY'\nimport sqlite3\ndb=sqlite3.connect('/var/lib/failover/records.sqlite3')\ndb.execute('CREATE TABLE IF NOT EXISTS records (id TEXT PRIMARY KEY, value TEXT NOT NULL)')\nfor record,value in [('customer-red-4a7','red-original'),('customer-blue-8d2','blue-original'),('customer-green-f31','green-original')]:\n db.execute('INSERT OR IGNORE INTO records(id,value) VALUES(?,?)',(record,value))\ndb.commit()\nPY\n\n\n===\ntotal 28\ndrwxr-xr-x 2 root root 4096 Oct 13 22:58 .\ndrwxr-xr-x 9 root root 4096 Oct 13 22:58 ..\n-rw-r--r-- 1 root root 0 Oct 13 22:58 primary.failed\n-rw-r--r-- 1 root root 12288 Oct 13 22:58 records.sqlite3\n-rw-r--r-- 1 root root 8 Oct 13 22:58 replica.role\n-rw-r--r-- 1 root root 5 Oct 13 22:58 upstream\n/nix/store/8di1gyrag3hq9bw4nv6cic0ilxv1jfjg-failover-proxy.py.drv\n/nix/store/yn0iabm0h5xahc4r2isj8jshiwn1va36-failover-replica.py.drv\n/nix/store/k3kaqylbhyxkgaza3w5f93lcq3zaqkjd-unit-script-failover-seed-start.drv\n/nix/store/dzx73zf5xl8bsdjjwvvabrbvjlg85d75-unit-failover-proxy.service.drv\n/nix/store/qqvrshj7ppqfcga9ajjxz52f9lyl9wsh-unit-failover-replica.service.drv\n/nix/store/qhdq62mip7q0k7bjhdwidm3k7pxjbdch-unit-failover-seed.service.drv\n/nix/store/fq4zqfan2g2zlbwi96cwc3j8yivji5zv-nixos-system-failover-two-26.11.20260813.0e251e2.drv\n/nix/store/jhhs55ynhxhwkyr6b0icbbx7zxlhwhii-nixos-system-failover-one-26.11.20260813.0e251e2.drv\n/nix/store/h5fs814wf6aqrk2q8l1d8w6nj74cpm9v-nixos-system-failover-three-26.11.20260813.0e251e2.drv\n/nix/store/gy7xaavwyh9mbwz4ll8h6z3ban0s6g93-failover-proxy.py\n/nix/store/3lf8if1z3ahcv9mdxqmwncn87hnwdymi-failover-replica.py\n/nix/store/vnsdj3nml00cykxy4dmpcsgbwp76jspz-unit-script-failover-seed-start\n/nix/store/99lh6543zrnz8nadygg9xz3vz11aywr2-nixos-system-failover-three-26.11.20260813.0e251e2\n/nix/store/cssa3kcfm8vppf61nk06yh7j2n1gn2ml-unit-failover-replica.service\n/nix/store/819cls1w85azf4km9mwvbmn64mbwcbms-unit-failover-seed.service\n/nix/store/0a3wcrh8pzc7wax5x6d724lr804qdcgm-unit-failover-proxy.service\n/nix/store/yqlfx9gc823yx0d4sh9z3kf3y8yh8rnx-nixos-system-failover-one-26.11.20260813.0e251e2\n/nix/store/rn4ambqqvxbb2ng23l9f088xhdn2ham9-nixos-system-failover-two-26.11.20260813.0e251e2\n" } ] }, { "role": "assistant", "content": [ { "type": "reasoning", "text": "The seed script is idempotent and non-destructive:\n- `[[ -e upstream ]] || printf '8081'` — only creates if it doesn't exist. Preserves my promotion.\n- Same for `replica.role`.\n- `touch primary.failed` — preserves it (touch only updates mtime, file remains).\n- Seeds the DB with INSERT OR IGNORE — preserves existing and new records.\n\nSo this seed is reboot-safe with respect to my changes.\n\nThis is a NixOS system. The units come from a NixOS system profile (`/etc/systemd/system` is probably a generated directory — actually, the units are symlinks into /nix/store). On reboot, NixOS regenerates `/etc/systemd/system` from the current generation (from the activation at the last boot). Unless I change the NixOS configuration, the units on reboot will be the same ones. Since the seed is idempotent, the runtime state files in /var/lib/failover are preserved (they're on the root disk), and my promotion persists across reboot.\n\nNow, the recovery plan per the contract:\n\n1. Durably fence the old primary before restoring writes: create `/var/lib/failover/primary.fenced`. The contract says \"Preserve /var/lib/failover/primary.failed, create /var/lib/failover/primary.fenced, and do not let port 8081 listen again.\" Port 8081 is currently not listening — nothing is providing it. There's a risk that some other service might try to start the old primary, so I checked for a primary service — only the proxy, replica, and seed units exist. Nothing is listening on 8081. Good. To be extra safe, I could also verify that nothing is bound. Should I also add a systemd mask? The contract just says don't let it listen again — since there's no unit that starts the old primary, it won't come back on reboot either. But wait — this is NixOS, so there could be more in the configuration. `systemctl list-units --all | grep failover` only showed 3 units. Let me also check for failed units: `systemctl list-unit-files | grep failover`. There might be a `failover-primary.service` that's failed/inactive. Let me check.\n\n2. Promote the replica: write `primary` to `/var/lib/failover/replica.role`. The replica reads the role on every request, so no restart needed.\n\n3. Atomic proxy switchover: the proxy reads the upstream file on every request. Atomic switchover means writing the new upstream file via rename(2) so readers never see a truncated/partial file. Write to a temp file on the same filesystem and `mv -T` (rename) atomically. Order matters for safety: fence first, then promote the role, then switchover the upstream. Actually, to prevent split-brain: the replica accepts writes only if role()==primary; the old primary is dead so it can't write. The order is: (a) fence (create primary.fenced), (b) promote replica.role=primary, (c) atomically rename upstream file to 8082. Even if the proxy switches before promotion, writes get 503 (safe). The contract says \"durably fence before restoring writes\" — fencing is by file existence; to make it durable, fsync the file + directory so it survives the reboot/power loss. Also ensure these files persist across reboot: they're on the /var filesystem, persistent.\n\nBut the durability concern: on reboot the seed runs `touch primary.failed` — fine. The seed doesn't create primary.fenced, but the file already exists so it remains. Nothing resets it. Good.\n\nOne subtle point: to keep the fencing durable against the possibility that the seed or other activation resets it? Nothing in the seed deletes files. OK.\n\nAlso, should I make the fenced marker creation survive even if someone deletes it? No, the contract just says create it.\n\n4. Verification via the public port 8080:\n- GET /health → 200 \"ready\"\n- GET /role → 200 \"primary\"\n- PUT /records/ → 204, GET returns exact body\n- Existing records preserved (red/blue/green-original)\n- 8081 not listening.\n- Also verify 503 read-only path? No, after promotion writes work.\n\n5. Restart-resilience test: can I restart services with `systemctl restart failover-replica failover-proxy` (service restart, not host reboot) — permitted and prudent: \"must survive service restart and full host reboot.\" Service restart is safe to test. Don't reboot the host.\n\n6. Reboot resilience without rebooting: verify units are enabled (WantedBy=multi-user.target + enabled state). Verify seed idempotency preserves my files (already verified by reading the script: `-e` checks). Check `systemctl is-enabled failover-proxy failover-replica failover-seed`. The status showed \"enabled\" for seed; check the others too.\n\nAlso, NixOS at activation time... at stage-2 activation on reboot, NixOS re-runs system activation, which regenerates units and... does NixOS's `switch-to-configuration` run at boot? Actually on NixOS, the activation script runs at boot (\"systemd stage-2\" runs the activation via `switch-to-configuration boot` in a systemd unit? There's `nixos-boot`/`systemd-auto-defect`... In standard NixOS, at boot the \"nixos-activation\" is not re-run by default? Hmm — actually standard NixOS does re-run activation at boot via the systemd unit `nixos-activation.service`? Let me recall: NixOS runs `switch-to-configuration boot` during boot before the stage-2 activation as initrd's \"systemd\" stage 2? I remember NixOS re-runs activation on boot (\"systemd.update\" / nixos-activation.service exists in newer systemd-based NixOS). Either way, the activation script touches files in /var/run, regenerates /etc, and doesn't touch /var/lib/failover except through the seed unit, which is idempotent as shown. And the units are recreated from the same derivation pointing to the same scripts in the nix store. So the state survives.\n\nAnother consideration: /nix/store is on a persistent root disk (not tmpfs), so it survives across reboots. Yes, standard NixOS.\n\nFurther possible trick: are there any other units or paths (e.g., a systemd path unit or timer) that would reset replica.role/upstream or restart the old primary? Let me search /etc/systemd/system and unit files for \"failover\" and \"primary\". Also check port 8081 for anything else, and look for a masked or disabled `failover-primary.service`. Also check `/etc/systemd/system/` listing and `systemctl list-unit-files | grep -i -E 'failover|primary|8081'`.\n\nAlso, the contract mentions \"atomically switch the proxy\" — use rename. And prevent split-brain: ensure only the replica can accept writes; verify nothing else writes to the DB. The old primary's code isn't running.\n\nAlso consider fsyncing the writes (file + parent directory) for durability against a power-cut-style reboot. The referee probably does a graceful reboot, but fsync is cheap and literally satisfies \"durably fenced.\" I can write a small python script that does this with fsync.\n\nExecution plan:\n1. Check that no other units exist that could resurrect the primary / reset state; verify is-enabled for the 3 units.\n2. Create /var/lib/failover/primary.fenced durably (write + fsync + directory fsync). Preserve primary.failed.\n3. Promote: atomically replace replica.role with \"primary\\n\" (temp file + rename + fsync). Actually, for the role file, the replica reads on every request; rename is atomic; a reader opens the file — no problem.\n4. Switch proxy: atomically rename upstream file to \"8082\\n\".\n5. Verify endpoints via 8080: health, role, new PUT/GET round-trip, original 3 records via 8080, 404 behavior.\n6. Verify 8081 is not listening.\n7. Restart units (systemctl restart failover-replica failover-proxy), verify again — survives service restart.\n8. Re-run the seed unit manually (systemctl restart failover-seed) to simulate boot-time behavior, verify files aren't reset. That's safe: seed is idempotent; restart to prove it. But careful: does seed require the others? Restarting seed alone just runs the script; with `-e` checks, my files are preserved. Good proof of boot-time behavior without rebooting.\n9. Leave everything running.\n\nAlso check the default target / that the units are enabled at boot: `systemctl is-enabled`. The earlier status showed seed as \"enabled\". Check the proxy and replica too.\n\nNow let me perform the checks, then implement. Write a small python snippet with fsync for atomic, durable promotion.\n\nOne more: `primary.failed` — \"Preserve\" — don't touch content; the seed touches (mtime) but that's fine.\n\nAlso ensure that nothing is configured to bind 8081 on boot — search all unit files for 8081. Grep /etc/systemd/system and nix units.\n\nThe seed script is idempotent (guarded by `[[ -e ]]`, and the DB uses `INSERT OR IGNORE`). So the state files I promoted are preserved even upon re-execution at boot. Next, let's confirm there are no other units that could resurrect the old primary or reset the role, and that the units are enabled at boot:", "details": [ { "format": "unknown", "index": 0, "text": "The seed script is idempotent and non-destructive:\n- `[[ -e upstream ]] || printf '8081'` — only creates if it doesn't exist. Preserves my promotion.\n- Same for `replica.role`.\n- `touch primary.failed` — preserves it (touch only updates mtime, file remains).\n- Seeds the DB with INSERT OR IGNORE — preserves existing and new records.\n\nSo this seed is reboot-safe with respect to my changes.\n\nThis is a NixOS system. The units come from a NixOS system profile (`/etc/systemd/system` is probably a generated directory — actually, the units are symlinks into /nix/store). On reboot, NixOS regenerates `/etc/systemd/system` from the current generation (from the activation at the last boot). Unless I change the NixOS configuration, the units on reboot will be the same ones. Since the seed is idempotent, the runtime state files in /var/lib/failover are preserved (they're on the root disk), and my promotion persists across reboot.\n\nNow, the recovery plan per the contract:\n\n1. Durably fence the old primary before restoring writes: create `/var/lib/failover/primary.fenced`. The contract says \"Preserve /var/lib/failover/primary.failed, create /var/lib/failover/primary.fenced, and do not let port 8081 listen again.\" Port 8081 is currently not listening — nothing is providing it. There's a risk that some other service might try to start the old primary, so I checked for a primary service — only the proxy, replica, and seed units exist. Nothing is listening on 8081. Good. To be extra safe, I could also verify that nothing is bound. Should I also add a systemd mask? The contract just says don't let it listen again — since there's no unit that starts the old primary, it won't come back on reboot either. But wait — this is NixOS, so there could be more in the configuration. `systemctl list-units --all | grep failover` only showed 3 units. Let me also check for failed units: `systemctl list-unit-files | grep failover`. There might be a `failover-primary.service` that's failed/inactive. Let me check.\n\n2. Promote the replica: write `primary` to `/var/lib/failover/replica.role`. The replica reads the role on every request, so no restart needed.\n\n3. Atomic proxy switchover: the proxy reads the upstream file on every request. Atomic switchover means writing the new upstream file via rename(2) so readers never see a truncated/partial file. Write to a temp file on the same filesystem and `mv -T` (rename) atomically. Order matters for safety: fence first, then promote the role, then switchover the upstream. Actually, to prevent split-brain: the replica accepts writes only if role()==primary; the old primary is dead so it can't write. The order is: (a) fence (create primary.fenced), (b) promote replica.role=primary, (c) atomically rename upstream file to 8082. Even if the proxy switches before promotion, writes get 503 (safe). The contract says \"durably fence before restoring writes\" — fencing is by file existence; to make it durable, fsync the file + directory so it survives the reboot/power loss. Also ensure these files persist across reboot: they're on the /var filesystem, persistent.\n\nBut the durability concern: on reboot the seed runs `touch primary.failed` — fine. The seed doesn't create primary.fenced, but the file already exists so it remains. Nothing resets it. Good.\n\nOne subtle point: to keep the fencing durable against the possibility that the seed or other activation resets it? Nothing in the seed deletes files. OK.\n\nAlso, should I make the fenced marker creation survive even if someone deletes it? No, the contract just says create it.\n\n4. Verification via the public port 8080:\n- GET /health → 200 \"ready\"\n- GET /role → 200 \"primary\"\n- PUT /records/ → 204, GET returns exact body\n- Existing records preserved (red/blue/green-original)\n- 8081 not listening.\n- Also verify 503 read-only path? No, after promotion writes work.\n\n5. Restart-resilience test: can I restart services with `systemctl restart failover-replica failover-proxy` (service restart, not host reboot) — permitted and prudent: \"must survive service restart and full host reboot.\" Service restart is safe to test. Don't reboot the host.\n\n6. Reboot resilience without rebooting: verify units are enabled (WantedBy=multi-user.target + enabled state). Verify seed idempotency preserves my files (already verified by reading the script: `-e` checks). Check `systemctl is-enabled failover-proxy failover-replica failover-seed`. The status showed \"enabled\" for seed; check the others too.\n\nAlso, NixOS at activation time... at stage-2 activation on reboot, NixOS re-runs system activation, which regenerates units and... does NixOS's `switch-to-configuration` run at boot? Actually on NixOS, the activation script runs at boot (\"systemd stage-2\" runs the activation via `switch-to-configuration boot` in a systemd unit? There's `nixos-boot`/`systemd-auto-defect`... In standard NixOS, at boot the \"nixos-activation\" is not re-run by default? Hmm — actually standard NixOS does re-run activation at boot via the systemd unit `nixos-activation.service`? Let me recall: NixOS runs `switch-to-configuration boot` during boot before the stage-2 activation as initrd's \"systemd\" stage 2? I remember NixOS re-runs activation on boot (\"systemd.update\" / nixos-activation.service exists in newer systemd-based NixOS). Either way, the activation script touches files in /var/run, regenerates /etc, and doesn't touch /var/lib/failover except through the seed unit, which is idempotent as shown. And the units are recreated from the same derivation pointing to the same scripts in the nix store. So the state survives.\n\nAnother consideration: /nix/store is on a persistent root disk (not tmpfs), so it survives across reboots. Yes, standard NixOS.\n\nFurther possible trick: are there any other units or paths (e.g., a systemd path unit or timer) that would reset replica.role/upstream or restart the old primary? Let me search /etc/systemd/system and unit files for \"failover\" and \"primary\". Also check port 8081 for anything else, and look for a masked or disabled `failover-primary.service`. Also check `/etc/systemd/system/` listing and `systemctl list-unit-files | grep -i -E 'failover|primary|8081'`.\n\nAlso, the contract mentions \"atomically switch the proxy\" — use rename. And prevent split-brain: ensure only the replica can accept writes; verify nothing else writes to the DB. The old primary's code isn't running.\n\nAlso consider fsyncing the writes (file + parent directory) for durability against a power-cut-style reboot. The referee probably does a graceful reboot, but fsync is cheap and literally satisfies \"durably fenced.\" I can write a small python script that does this with fsync.\n\nExecution plan:\n1. Check that no other units exist that could resurrect the primary / reset state; verify is-enabled for the 3 units.\n2. Create /var/lib/failover/primary.fenced durably (write + fsync + directory fsync). Preserve primary.failed.\n3. Promote: atomically replace replica.role with \"primary\\n\" (temp file + rename + fsync). Actually, for the role file, the replica reads on every request; rename is atomic; a reader opens the file — no problem.\n4. Switch proxy: atomically rename upstream file to \"8082\\n\".\n5. Verify endpoints via 8080: health, role, new PUT/GET round-trip, original 3 records via 8080, 404 behavior.\n6. Verify 8081 is not listening.\n7. Restart units (systemctl restart failover-replica failover-proxy), verify again — survives service restart.\n8. Re-run the seed unit manually (systemctl restart failover-seed) to simulate boot-time behavior, verify files aren't reset. That's safe: seed is idempotent; restart to prove it. But careful: does seed require the others? Restarting seed alone just runs the script; with `-e` checks, my files are preserved. Good proof of boot-time behavior without rebooting.\n9. Leave everything running.\n\nAlso check the default target / that the units are enabled at boot: `systemctl is-enabled`. The earlier status showed seed as \"enabled\". Check the proxy and replica too.\n\nNow let me perform the checks, then implement. Write a small python snippet with fsync for atomic, durable promotion.\n\nOne more: `primary.failed` — \"Preserve\" — don't touch content; the seed touches (mtime) but that's fine.\n\nAlso ensure that nothing is configured to bind 8081 on boot — search all unit files for 8081. Grep /etc/systemd/system and nix units.\n\nThe seed script is idempotent (guarded by `[[ -e ]]`, and the DB uses `INSERT OR IGNORE`). So the state files I promoted are preserved even upon re-execution at boot. Next, let's confirm there are no other units that could resurrect the old primary or reset the role, and that the units are enabled at boot:", "type": "reasoning.text" } ] }, { "type": "tool_use", "id": "call_7493e5f057c840fb9aab5c54", "name": "Bash", "input": { "command": "systemctl is-enabled failover-proxy failover-replica failover-seed; echo ---; systemctl list-unit-files 2>/dev/null | grep -iE 'failover|primary|8081'; echo ---; grep -rl '8081\\|replica.role\\|upstream' /etc/systemd/system/ 2>/dev/null | while read f; do echo \"== $f\"; done; echo ---; systemctl list-timers --all --no-pager 2>/dev/null | head -8; echo ---; systemctl --failed --no-pager | head -8; echo ---; ls /etc/systemd/system/ /etc/systemd/system/*.wants 2>/dev/null | head -40", "description": "Check enabled state, other units referencing ports/role files, timers, failures" } } ] }, { "role": "user", "content": [ { "type": "tool_result", "tool_use_id": "call_7493e5f057c840fb9aab5c54", "content": "enabled\nenabled\nenabled\n---\nfailover-proxy.service enabled ignored\nfailover-replica.service enabled ignored\nfailover-seed.service enabled ignored\n---\n---\nNEXT LEFT LAST PASSED UNIT ACTIVATES\nTue 2026-10-13 23:13:28 UTC 13min - - systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service\nWed 2026-10-14 00:00:00 UTC 59min Tue 2026-10-13 23:00:00 UTC 11s ago logrotate.timer logrotate.service\nMon 2026-10-19 00:40:21 UTC 5 days - - fstrim.timer fstrim.service\n\n3 timers listed.\n---\n UNIT LOAD ACTIVE SUB DESCRIPTION\n\n0 loaded units listed.\n---\n/etc/systemd/system/:\nautovt@.service\nbasic.target\nblk-availability.service\nbluetooth.target\nboot-complete.target\ncapsule@.service\ncapsule.slice\nconsole-getty.service\ncontainer-getty@.service\ncontainer-getty@.service.d\ncryptsetup-pre.target\ncryptsetup.target\nctrl-alt-del.target\ndbus-broker.service\ndbus-broker.service.d\ndbus-org.freedesktop.hostname1.service\ndbus-org.freedesktop.import1.service\ndbus-org.freedesktop.locale1.service\ndbus-org.freedesktop.login1.service\ndbus-org.freedesktop.machine1.service\ndbus-org.freedesktop.network1.service\ndbus-org.freedesktop.portable1.service\ndbus-org.freedesktop.resolve1.service\ndbus-org.freedesktop.timedate1.service\ndbus.service\ndbus.service.d\ndbus.socket\ndebug-shell.service\ndefault.target\ndefault.target.wants\ndev-hugepages.mount\ndev-mqueue.mount\nemergency.service\nemergency.target\nexit.target\nfactory-reset.target\nfactory-reset.target.wants\nfailover-proxy.service\nfailover-replica.service\n" } ] } ], "tool_trace": [ { "id": "call_dd102eb8683340d096260c27", "name": "Bash", "input": { "command": "ls -la /var/lib/failover/ 2>&1; echo ---; cat /var/lib/failover/replica.role /var/lib/failover/upstream /var/lib/failover/primary.failed 2>&1; echo ---; ps aux | grep -iE 'failover|proxy|replica|8081|8082|8080|primary' | grep -v grep", "description": "Inspect failover state directory and running processes" }, "output": "total 28\ndrwxr-xr-x 2 root root 4096 Oct 13 22:58 .\ndrwxr-xr-x 9 root root 4096 Oct 13 22:58 ..\n-rw-r--r-- 1 root root 0 Oct 13 22:58 primary.failed\n-rw-r--r-- 1 root root 12288 Oct 13 22:58 records.sqlite3\n-rw-r--r-- 1 root root 8 Oct 13 22:58 replica.role\n-rw-r--r-- 1 root root 5 Oct 13 22:58 upstream\n---\nreplica\n8081\n---\nroot 556 1.3 3.4 113184 24808 ? Ss 22:58 0:00 /nix/store/3n4qphl9s728sz8frmpqqrv9b1m87g68-python3-3.14.7/bin/python /nix/store/gy7xaavwyh9mbwz4ll8h6z3ban0s6g93-failover-proxy.py\nroot 557 1.0 3.4 41384 25448 ? Ss 22:58 0:00 /nix/store/3n4qphl9s728sz8frmpqqrv9b1m87g68-python3-3.14.7/bin/python /nix/store/3lf8if1z3ahcv9mdxqmwncn87hnwdymi-failover-replica.py\nroot 677 0.0 0.4 7980 3236 ? Ss 22:58 0:00 bash -c chmod 0700 '/var/tmp/agents-of-empires-qwen-flash/claux' '/var/tmp/agents-of-empires-qwen-flash/strace' && cd /root && OPENROUTER_API_KEY=arena-proxy-placeholder '/var/tmp/agents-of-empires-qwen-flash/claux' config init --provider openrouter --model 'qwen/qwen3.8-flash' >/dev/null && sed -i 's#^base_url = .*#base_url = \"http://127.0.0.1:18002/api/v1\"#' /root/.config/claux/config.toml && sed -i 's/^native_tool_filesystem_policy = .*/native_tool_filesystem_policy = \"unrestricted\"/' /root/.config/claux/config.toml && sed -i 's/^bash_filesystem_policy = .*/bash_filesystem_policy = \"unrestricted\"/' /root/.config/claux/config.toml && profile=$(sed -n 's/^default_profile = \"\\([^\"]*\\)\"/\\1/p' /root/.config/claux/config.toml) && awk -v section=\"[model_profiles.${profile}]\" -v effort='' '{ print; if ($0 == section && effort != \"\") print \"reasoning_effort = \\\"\" effort \"\\\"\" }' /root/.config/claux/config.toml > /root/.config/claux/config.toml.partial && mv /root/.config/claux/config.toml.partial /root/.config/claux/config.toml && OPENROUTER_API_KEY=arena-proxy-placeholder '/var/tmp/agents-of-empires-qwen-flash/strace' --seccomp-bpf -f -qq -s 4096 -e trace=execve -o '/var/tmp/agents-of-empires-qwen-flash/exec.trace' '/var/tmp/agents-of-empires-qwen-flash/claux' --print \"$(cat '/var/tmp/agents-of-empires-qwen-flash/instruction.md')\" --permission-mode bypass --output-format json --transcript '/var/tmp/agents-of-empires-qwen-flash/transcript.json' > '/var/tmp/agents-of-empires-qwen-flash/result.json'\nroot 688 0.0 0.2 2772 1636 ? S 22:58 0:00 /var/tmp/agents-of-empires-qwen-flash/strace --seccomp-bpf -f -qq -s 4096 -e trace=execve -o /var/tmp/agents-of-empires-qwen-flash/exec.trace /var/tmp/agents-of-empires-qwen-flash/claux --print Recover the stateful primary failure in the contract appended below. Preserve customer data and prevent split brain. Speed matters, but only a durable, fenced topology can win. The controller-owned referee is the only authority on completion. Do not stop after merely describing the work. Implement the service on this host, verify it yourself, and leave it running. You have no access to referee evidence or other competitors. # Service contract # Stateful primary failover contract The public record service on port 8080 is unavailable because its proxy still targets the failed old primary on `127.0.0.1:8081`. A healthy read-only replica is running on `127.0.0.1:8082`. Existing customer state is stored in `/var/lib/failover/records.sqlite3` and must not be discarded or replaced. Restore the public service by safely promoting the replica and atomically switching the proxy. The replica reads its role from `/var/lib/failover/replica.role` on every request. It accepts writes only when that file contains `primary`. The proxy reads its upstream port from `/var/lib/failover/upstream` on every request. The public API contract is: - `GET /health`: `200` with exact body `ready`; - `GET /role`: `200` with exact body `primary` after promotion; - `PUT /records/`: persist the UTF-8 body and return `204`; - `GET /records/`: return the exact body, or `404` when absent. The old primary must remain failed and must be durably fenced before writes are restored. Preserve `/var/lib/failover/primary.failed`, create `/var/lib/failover/primary.fenced`, and do not make port 8081 listen again. The promoted topology, original records, and new writes must survive service restart and full host reboot without agent help. The referee performs host reboot testing. Do not reboot, shut down, or power off this guest yourself, or schedule those operations. Leave the deployment running for the referee to test. --permission-mode bypass --output-format json --transcript /var/tmp/agents-of-empires-qwen-flash/transcript.json\nroot 692 1.1 2.6 104020 19624 ? Sl 22:58 0:00 /var/tmp/agents-of-empires-qwen-flash/claux --print Recover the stateful primary failure in the contract appended below. Preserve customer data and prevent split brain. Speed matters, but only a durable, fenced topology can win. The controller-owned referee is the only authority on completion. Do not stop after merely describing the work. Implement the service on this host, verify it yourself, and leave it running. You have no access to referee evidence or other competitors. # Service contract # Stateful primary failover contract The public record service on port 8080 is unavailable because its proxy still targets the failed old primary on `127.0.0.1:8081`. A healthy read-only replica is running on `127.0.0.1:8082`. Existing customer state is stored in `/var/lib/failover/records.sqlite3` and must not be discarded or replaced. Restore the public service by safely promoting the replica and atomically switching the proxy. The replica reads its role from `/var/lib/failover/replica.role` on every request. It accepts writes only when that file contains `primary`. The proxy reads its upstream port from `/var/lib/failover/upstream` on every request. The public API contract is: - `GET /health`: `200` with exact body `ready`; - `GET /role`: `200` with exact body `primary` after promotion; - `PUT /records/`: persist the UTF-8 body and return `204`; - `GET /records/`: return the exact body, or `404` when absent. The old primary must remain failed and must be durably fenced before writes are restored. Preserve `/var/lib/failover/primary.failed`, create `/var/lib/failover/primary.fenced`, and do not make port 8081 listen again. The promoted topology, original records, and new writes must survive service restart and full host reboot without agent help. The referee performs host reboot testing. Do not reboot, shut down, or power off this guest yourself, or schedule those operations. Leave the deployment running for the referee to test. --permission-mode bypass --output-format json --transcript /var/tmp/agents-of-empires-qwen-flash/transcript.json\n", "is_error": false, "read_only": false, "started_after_ms": 8802, "duration_ms": 61 }, { "id": "call_fdd9120edaac403c820b071d", "name": "Bash", "input": { "command": "(ss -tlnp 2>/dev/null || netstat -tlnp 2>/dev/null) | grep -E '808[012]'; echo ---; for p in 8080 8081 8082; do echo \"== $p ==\"; curl -s -m 3 http://127.0.0.1:$p/health; echo; done", "description": "Check listening ports and probe service health endpoints" }, "output": "LISTEN 0 5 127.0.0.1:8082 0.0.0.0:* users:((\"python\",pid=557,fd=3))\nLISTEN 0 5 0.0.0.0:8080 0.0.0.0:* users:((\"python\",pid=556,fd=3))\n---\n== 8080 ==\n\n== 8081 ==\n\n== 8082 ==\nready\n", "is_error": false, "read_only": false, "started_after_ms": 8864, "duration_ms": 101 }, { "id": "call_0d89d3fcb9724abfb05a1c26", "name": "Bash", "input": { "command": "cat /nix/store/3lf8if1z3ahcv9mdxqmwncn87hnwdymi-failover-replica.py; echo ===PROXY===; cat /nix/store/gy7xaavwyh9mbwz4ll8h6z3ban0s6g93-failover-proxy.py", "description": "Read replica and proxy scripts" }, "output": "import sqlite3\nfrom http.server import BaseHTTPRequestHandler, ThreadingHTTPServer\nDB = \"/var/lib/failover/records.sqlite3\"\nROLE = \"/var/lib/failover/replica.role\"\ndef role():\n with open(ROLE) as source: return source.read().strip()\ndef database():\n connection = sqlite3.connect(DB, timeout=10)\n connection.execute(\"CREATE TABLE IF NOT EXISTS records (id TEXT PRIMARY KEY, value TEXT NOT NULL)\")\n return connection\nclass Handler(BaseHTTPRequestHandler):\n def send(self, status, body=b\"\"):\n self.send_response(status); self.send_header(\"Content-Length\", str(len(body))); self.end_headers(); self.wfile.write(body)\n def do_GET(self):\n if self.path == \"/health\": self.send(200, b\"ready\"); return\n if self.path == \"/role\": self.send(200, role().encode()); return\n if self.path.startswith(\"/records/\"):\n connection = database(); row = connection.execute(\"SELECT value FROM records WHERE id=?\", (self.path[9:],)).fetchone(); connection.close()\n self.send(404 if row is None else 200, b\"\" if row is None else row[0].encode()); return\n self.send(404)\n def do_PUT(self):\n if not self.path.startswith(\"/records/\"): self.send(404); return\n if role() != \"primary\": self.send(503, b\"read-only\"); return\n value = self.rfile.read(int(self.headers.get(\"Content-Length\", \"0\"))).decode(); connection = database()\n connection.execute(\"INSERT INTO records(id,value) VALUES(?,?) ON CONFLICT(id) DO UPDATE SET value=excluded.value\", (self.path[9:], value))\n connection.commit(); connection.close(); self.send(204)\n def log_message(self, *_): pass\nThreadingHTTPServer((\"127.0.0.1\", 8082), Handler).serve_forever()\n===PROXY===\nimport http.client\nfrom http.server import BaseHTTPRequestHandler, ThreadingHTTPServer\nUPSTREAM = \"/var/lib/failover/upstream\"\nclass Handler(BaseHTTPRequestHandler):\n def forward(self):\n try:\n with open(UPSTREAM) as source: port = int(source.read().strip())\n body = self.rfile.read(int(self.headers.get(\"Content-Length\", \"0\")))\n connection = http.client.HTTPConnection(\"127.0.0.1\", port, timeout=2)\n connection.request(self.command, self.path, body=body)\n response = connection.getresponse(); data = response.read()\n self.send_response(response.status); self.send_header(\"Content-Length\", str(len(data))); self.end_headers(); self.wfile.write(data)\n connection.close()\n except Exception:\n self.send_response(502); self.send_header(\"Content-Length\", \"0\"); self.end_headers()\n do_GET = forward\n do_PUT = forward\n def log_message(self, *_): pass\nThreadingHTTPServer((\"0.0.0.0\", 8080), Handler).serve_forever()\n", "is_error": false, "read_only": false, "started_after_ms": 17892, "duration_ms": 51 }, { "id": "call_1264980f4edd4840be7c7a21", "name": "Bash", "input": { "command": "echo \"== init ==\"; ps -p 1 -o comm=; systemctl is-system-running 2>&1 | head -1; echo \"== units mentioning failover ==\"; systemctl list-units --all 2>/dev/null | grep -iE 'failover|record|replica|proxy' ; grep -rliE 'failover' /etc/systemd/system /lib/systemd/system /etc/init.d /etc/rc.local /etc/cron* 2>/dev/null; echo \"== cron ==\"; crontab -l 2>&1; ls /etc/cron.d 2>/dev/null; echo \"== proxy 8080 detail ==\"; curl -s -m 3 -o /dev/null -w '%{http_code}\\n' http://127.0.0.1:8080/health; echo \"== sqlite ==\"; sqlite3 /var/lib/failover/records.sqlite3 '.tables' '.schema' 'select count(*) from records;' 2>&1 || python3 -c \"import sqlite3;c=sqlite3.connect('/var/lib/failover/records.sqlite3');print(c.execute('select name,sql from sqlite_master').fetchall());print(c.execute('select * from records limit 5').fetchall())\" 2>&1", "description": "Inspect init system, service units, cron, proxy status, sqlite state" }, "output": "== init ==\nsystemd\nrunning\n== units mentioning failover ==\n failover-proxy.service loaded active running Public proxy stranded on failed primary\n failover-replica.service loaded active running Healthy read-only failover replica\n failover-seed.service loaded active exited Seed failed-primary topology and replicated state\n systemd-pcrlogin@0.service loaded inactive dead TPM NvPCR Measurement of User Record for UID 0\n systemd-update-utmp.service loaded active exited Record System Boot/Shutdown in UTMP\n== cron ==\nsh: line 1: crontab: command not found\n== proxy 8080 detail ==\n502\n== sqlite ==\nrecords\nCREATE TABLE records (id TEXT PRIMARY KEY, value TEXT NOT NULL);\n3\n", "is_error": false, "read_only": false, "started_after_ms": 17943, "duration_ms": 276 }, { "id": "call_882fb94c041c428dacfac37d", "name": "Bash", "input": { "command": "for u in failover-proxy failover-replica failover-seed; do echo \"=== $u ===\"; systemctl cat $u.service 2>&1; done; echo \"=== seed service status/logs ===\"; systemctl status failover-seed --no-pager -l 2>&1 | head -20", "description": "Show failover systemd unit definitions" }, "output": "=== failover-proxy ===\n# /etc/systemd/system/failover-proxy.service -> /nix/store/0a3wcrh8pzc7wax5x6d724lr804qdcgm-unit-failover-proxy.service/failover-proxy.service\n[Unit]\nAfter=failover-seed.service\nDescription=Public proxy stranded on failed primary\nRequires=failover-seed.service\n\n[Service]\nEnvironment=\"LOCALE_ARCHIVE=/nix/store/c59mcax29xrwyfdqs308wkmn2srnmzkn-glibc-locales-2.42-67/lib/locale/locale-archive\"\nEnvironment=\"PATH=/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/bin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/bin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/bin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/bin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/bin:/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/sbin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/sbin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/sbin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/sbin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/sbin\"\nEnvironment=\"TZDIR=/nix/store/vlgjd2179ahfh509p1aid8fl22bw8ri3-tzdata-2026c/share/zoneinfo\"\nExecStart=/nix/store/3n4qphl9s728sz8frmpqqrv9b1m87g68-python3-3.14.7/bin/python /nix/store/gy7xaavwyh9mbwz4ll8h6z3ban0s6g93-failover-proxy.py\nRestart=always\nRestartSec=1\n\n[Install]\nWantedBy=multi-user.target\n=== failover-replica ===\n# /etc/systemd/system/failover-replica.service -> /nix/store/cssa3kcfm8vppf61nk06yh7j2n1gn2ml-unit-failover-replica.service/failover-replica.service\n[Unit]\nAfter=failover-seed.service\nDescription=Healthy read-only failover replica\nRequires=failover-seed.service\n\n[Service]\nEnvironment=\"LOCALE_ARCHIVE=/nix/store/c59mcax29xrwyfdqs308wkmn2srnmzkn-glibc-locales-2.42-67/lib/locale/locale-archive\"\nEnvironment=\"PATH=/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/bin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/bin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/bin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/bin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/bin:/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/sbin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/sbin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/sbin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/sbin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/sbin\"\nEnvironment=\"TZDIR=/nix/store/vlgjd2179ahfh509p1aid8fl22bw8ri3-tzdata-2026c/share/zoneinfo\"\nExecStart=/nix/store/3n4qphl9s728sz8frmpqqrv9b1m87g68-python3-3.14.7/bin/python /nix/store/3lf8if1z3ahcv9mdxqmwncn87hnwdymi-failover-replica.py\nRestart=always\nRestartSec=1\n\n[Install]\nWantedBy=multi-user.target\n=== failover-seed ===\n# /etc/systemd/system/failover-seed.service -> /nix/store/819cls1w85azf4km9mwvbmn64mbwcbms-unit-failover-seed.service/failover-seed.service\n[Unit]\nBefore=failover-replica.service failover-proxy.service\nDescription=Seed failed-primary topology and replicated state\n\n[Service]\nEnvironment=\"LOCALE_ARCHIVE=/nix/store/c59mcax29xrwyfdqs308wkmn2srnmzkn-glibc-locales-2.42-67/lib/locale/locale-archive\"\nEnvironment=\"PATH=/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/bin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/bin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/bin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/bin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/bin:/nix/store/97d5ygrvqj55f4nx1x34wfdcc7qn11c0-coreutils-9.11/sbin:/nix/store/ibg16grw5is7i7ilnflc5xmj6fwksqkl-findutils-4.11.0/sbin:/nix/store/4dgym2zhac9vy0vrih4gsplh0wpfl13m-gnugrep-3.12/sbin:/nix/store/rxd8p6g4k4s0sx4q1szmzvp9rsmhmfys-gnused-4.10/sbin:/nix/store/mc901k2s1n3v1disrj0356l7lwz7l6vg-systemd-261.1/sbin\"\nEnvironment=\"TZDIR=/nix/store/vlgjd2179ahfh509p1aid8fl22bw8ri3-tzdata-2026c/share/zoneinfo\"\nExecStart=/nix/store/vnsdj3nml00cykxy4dmpcsgbwp76jspz-unit-script-failover-seed-start/bin/failover-seed-start \nRemainAfterExit=true\nType=oneshot\n\n[Install]\nWantedBy=multi-user.target\n=== seed service status/logs ===\n● failover-seed.service - Seed failed-primary topology and replicated state\n Loaded: loaded (/etc/systemd/system/failover-seed.service; enabled; preset: ignored)\n Active: active (exited) since Tue 2026-10-13 22:58:39 UTC; 31s ago\n Invocation: 83f823b167694888847665c3167b0da2\n Process: 497 ExecStart=/nix/store/vnsdj3nml00cykxy4dmpcsgbwp76jspz-unit-script-failover-seed-start/bin/failover-seed-start (code=exited, status=0/SUCCESS)\n Main PID: 497 (code=exited, status=0/SUCCESS)\n IP: 0B in, 0B out\n IO: 0B read, 52K written\n Mem peak: 11M\n CPU: 95ms\n\nOct 13 22:58:38 failover-two systemd[1]: Starting Seed failed-primary topology and replicated state...\nOct 13 22:58:39 failover-two systemd[1]: Finished Seed failed-primary topology and replicated state.\n", "is_error": false, "read_only": false, "started_after_ms": 24945, "duration_ms": 70 }, { "id": "call_dc42490204454498a93c0ffd", "name": "Bash", "input": { "command": "python3 -c \"\nimport sqlite3\nc=sqlite3.connect('file:/var/lib/failover/records.sqlite3?mode=ro',uri=True)\nprint(c.execute('select id,value from records order by id').fetchall())\n\"; ls -la /var/lib/failover/; md5sum /var/lib/failover/records.sqlite3", "description": "Snapshot existing customer records" }, "output": "[('customer-blue-8d2', 'blue-original'), ('customer-green-f31', 'green-original'), ('customer-red-4a7', 'red-original')]\ntotal 28\ndrwxr-xr-x 2 root root 4096 Oct 13 22:58 .\ndrwxr-xr-x 9 root root 4096 Oct 13 22:58 ..\n-rw-r--r-- 1 root root 0 Oct 13 22:58 primary.failed\n-rw-r--r-- 1 root root 12288 Oct 13 22:58 records.sqlite3\n-rw-r--r-- 1 root root 8 Oct 13 22:58 replica.role\n-rw-r--r-- 1 root root 5 Oct 13 22:58 upstream\n6b4059293b4ab42a1cc9cb2e3a3752ee /var/lib/failover/records.sqlite3\n", "is_error": false, "read_only": false, "started_after_ms": 25015, "duration_ms": 79 }, { "id": "call_7516c0d549c04a74b0cf1f5f", "name": "Bash", "input": { "command": "cat /nix/store/vnsdj3nml00cykxy4dmpcsgbwp76jspz-unit-script-failover-seed-start/bin/failover-seed-start; echo ===; ls -la /var/lib/failover 2>/dev/null; find /nix/store -maxdepth 1 -name '*failover*' 2>/dev/null", "description": "Read seed unit script" }, "output": "#!/nix/store/byi2zpy2bgcf3dr6y0l8m50rmjj8z7q1-bash-5.3p15/bin/bash\nset -e\n\ninstall -d -m 0755 /var/lib/failover\n[[ -e /var/lib/failover/upstream ]] || printf '8081\\n' > /var/lib/failover/upstream\n[[ -e /var/lib/failover/replica.role ]] || printf 'replica\\n' > /var/lib/failover/replica.role\ntouch /var/lib/failover/primary.failed\n/nix/store/3n4qphl9s728sz8frmpqqrv9b1m87g68-python3-3.14.7/bin/python - <<'PY'\nimport sqlite3\ndb=sqlite3.connect('/var/lib/failover/records.sqlite3')\ndb.execute('CREATE TABLE IF NOT EXISTS records (id TEXT PRIMARY KEY, value TEXT NOT NULL)')\nfor record,value in [('customer-red-4a7','red-original'),('customer-blue-8d2','blue-original'),('customer-green-f31','green-original')]:\n db.execute('INSERT OR IGNORE INTO records(id,value) VALUES(?,?)',(record,value))\ndb.commit()\nPY\n\n\n===\ntotal 28\ndrwxr-xr-x 2 root root 4096 Oct 13 22:58 .\ndrwxr-xr-x 9 root root 4096 Oct 13 22:58 ..\n-rw-r--r-- 1 root root 0 Oct 13 22:58 primary.failed\n-rw-r--r-- 1 root root 12288 Oct 13 22:58 records.sqlite3\n-rw-r--r-- 1 root root 8 Oct 13 22:58 replica.role\n-rw-r--r-- 1 root root 5 Oct 13 22:58 upstream\n/nix/store/8di1gyrag3hq9bw4nv6cic0ilxv1jfjg-failover-proxy.py.drv\n/nix/store/yn0iabm0h5xahc4r2isj8jshiwn1va36-failover-replica.py.drv\n/nix/store/k3kaqylbhyxkgaza3w5f93lcq3zaqkjd-unit-script-failover-seed-start.drv\n/nix/store/dzx73zf5xl8bsdjjwvvabrbvjlg85d75-unit-failover-proxy.service.drv\n/nix/store/qqvrshj7ppqfcga9ajjxz52f9lyl9wsh-unit-failover-replica.service.drv\n/nix/store/qhdq62mip7q0k7bjhdwidm3k7pxjbdch-unit-failover-seed.service.drv\n/nix/store/fq4zqfan2g2zlbwi96cwc3j8yivji5zv-nixos-system-failover-two-26.11.20260813.0e251e2.drv\n/nix/store/jhhs55ynhxhwkyr6b0icbbx7zxlhwhii-nixos-system-failover-one-26.11.20260813.0e251e2.drv\n/nix/store/h5fs814wf6aqrk2q8l1d8w6nj74cpm9v-nixos-system-failover-three-26.11.20260813.0e251e2.drv\n/nix/store/gy7xaavwyh9mbwz4ll8h6z3ban0s6g93-failover-proxy.py\n/nix/store/3lf8if1z3ahcv9mdxqmwncn87hnwdymi-failover-replica.py\n/nix/store/vnsdj3nml00cykxy4dmpcsgbwp76jspz-unit-script-failover-seed-start\n/nix/store/99lh6543zrnz8nadygg9xz3vz11aywr2-nixos-system-failover-three-26.11.20260813.0e251e2\n/nix/store/cssa3kcfm8vppf61nk06yh7j2n1gn2ml-unit-failover-replica.service\n/nix/store/819cls1w85azf4km9mwvbmn64mbwcbms-unit-failover-seed.service\n/nix/store/0a3wcrh8pzc7wax5x6d724lr804qdcgm-unit-failover-proxy.service\n/nix/store/yqlfx9gc823yx0d4sh9z3kf3y8yh8rnx-nixos-system-failover-one-26.11.20260813.0e251e2\n/nix/store/rn4ambqqvxbb2ng23l9f088xhdn2ham9-nixos-system-failover-two-26.11.20260813.0e251e2\n", "is_error": false, "read_only": false, "started_after_ms": 31635, "duration_ms": 1861 }, { "id": "call_7493e5f057c840fb9aab5c54", "name": "Bash", "input": { "command": "systemctl is-enabled failover-proxy failover-replica failover-seed; echo ---; systemctl list-unit-files 2>/dev/null | grep -iE 'failover|primary|8081'; echo ---; grep -rl '8081\\|replica.role\\|upstream' /etc/systemd/system/ 2>/dev/null | while read f; do echo \"== $f\"; done; echo ---; systemctl list-timers --all --no-pager 2>/dev/null | head -8; echo ---; systemctl --failed --no-pager | head -8; echo ---; ls /etc/systemd/system/ /etc/systemd/system/*.wants 2>/dev/null | head -40", "description": "Check enabled state, other units referencing ports/role files, timers, failures" }, "output": "enabled\nenabled\nenabled\n---\nfailover-proxy.service enabled ignored\nfailover-replica.service enabled ignored\nfailover-seed.service enabled ignored\n---\n---\nNEXT LEFT LAST PASSED UNIT ACTIVATES\nTue 2026-10-13 23:13:28 UTC 13min - - systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service\nWed 2026-10-14 00:00:00 UTC 59min Tue 2026-10-13 23:00:00 UTC 11s ago logrotate.timer logrotate.service\nMon 2026-10-19 00:40:21 UTC 5 days - - fstrim.timer fstrim.service\n\n3 timers listed.\n---\n UNIT LOAD ACTIVE SUB DESCRIPTION\n\n0 loaded units listed.\n---\n/etc/systemd/system/:\nautovt@.service\nbasic.target\nblk-availability.service\nbluetooth.target\nboot-complete.target\ncapsule@.service\ncapsule.slice\nconsole-getty.service\ncontainer-getty@.service\ncontainer-getty@.service.d\ncryptsetup-pre.target\ncryptsetup.target\nctrl-alt-del.target\ndbus-broker.service\ndbus-broker.service.d\ndbus-org.freedesktop.hostname1.service\ndbus-org.freedesktop.import1.service\ndbus-org.freedesktop.locale1.service\ndbus-org.freedesktop.login1.service\ndbus-org.freedesktop.machine1.service\ndbus-org.freedesktop.network1.service\ndbus-org.freedesktop.portable1.service\ndbus-org.freedesktop.resolve1.service\ndbus-org.freedesktop.timedate1.service\ndbus.service\ndbus.service.d\ndbus.socket\ndebug-shell.service\ndefault.target\ndefault.target.wants\ndev-hugepages.mount\ndev-mqueue.mount\nemergency.service\nemergency.target\nexit.target\nfactory-reset.target\nfactory-reset.target.wants\nfailover-proxy.service\nfailover-replica.service\n", "is_error": false, "read_only": false, "started_after_ms": 79806, "duration_ms": 5560 } ], "timing": { "total_duration_ms": 85367, "model_rounds": [ { "index": 1, "started_after_ms": 0, "duration_ms": 8801, "status": "completed", "usage": { "input_tokens": 3579, "output_tokens": 587, "cache_read_tokens": 0, "cache_creation_tokens": 0, "cost_usd": 0.00081274 } }, { "index": 2, "started_after_ms": 9128, "duration_ms": 8763, "status": "completed", "usage": { "input_tokens": 3042, "output_tokens": 672, "cache_read_tokens": 3328, "cache_creation_tokens": 0, "cost_usd": 0.000825388 } }, { "index": 3, "started_after_ms": 18223, "duration_ms": 6721, "status": "completed", "usage": { "input_tokens": 1802, "output_tokens": 331, "cache_read_tokens": 6144, "cache_creation_tokens": 0, "cost_usd": 0.000524174 } }, { "index": 4, "started_after_ms": 25098, "duration_ms": 6536, "status": "completed", "usage": { "input_tokens": 2872, "output_tokens": 276, "cache_read_tokens": 7936, "cache_creation_tokens": 0, "cost_usd": 0.000687496 } }, { "index": 5, "started_after_ms": 33498, "duration_ms": 46308, "status": "completed", "usage": { "input_tokens": 1585, "output_tokens": 2350, "cache_read_tokens": 10752, "cache_creation_tokens": 0, "cost_usd": 0.001514282 } } ] } }