[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"problem-detail-warning-rails-app-restart-loop-prevents-health-check":3},{"stack":4,"error":5,"seoName":6,"seoStack":7,"seo":8,"breadcrumb":10,"titlePrefix":17,"titleAccent":6,"lead":18,"facts":21,"why":36,"log":41,"fix":70,"engine":79,"related":86,"pitch":89},"rails","rails-app-restart-loop-prevents-health-check","Rails app restart loop prevents health check","Rails",{"description":9},"The application started but did not answer on any port it publishes. The deploy log has the per-port result; a worker or queue-only app can ignore this. | The a",[11,14,16],{"label":12,"href":13},"App Installations","\u002Fapps",{"label":7,"href":15},"\u002Fapps\u002Fstacks\u002Frails",{"label":6},"",[19],{"text":20},"The application started but did not answer on any port it publishes. The deploy log has the per-port result; a worker or queue-only app can ignore this. | The application is restarting, not running. Docker reports app (Restarting (1) 5 seconds ago). Nothing answered on any published port because the process keeps exiting. Read the container output with container_service_logs; the reason it exits is there.",[22,27,30,32],{"label":23,"value":24,"tone":25,"tooltip":26},"Type","Warning","warn","An issue PanelAlpha Engine catches around a deploy that does not break it. It tells you, before or after, that you may need to do something.",{"label":28,"value":29},"Seen","5 times",{"label":31,"value":7},"Where",{"label":33,"value":34,"tooltip":35},"Status","Observed","Our team will look into this soon, verify the cause and try to fix it in an upcoming release.",{"heading":37,"body":38},"Why it happens",[39],{"text":40},"The image built and the container started, but the Rails process exited during application initialization while loading routes. Docker then restarted the container, so nothing remained listening on port 3000. The exact Ruby exception is outside the captured log tail and needs the full container output.",{"heading":42,"block":43},"What the log looks like",{"header":44,"lines":45},"Deploy log",[46,50,54,58,62,66],{"segments":47},[48],{"text":49},"Image project-app Built",{"segments":51},[52],{"text":53},"Container project-app-1 Started",{"segments":55},[56],{"text":57},"Health check: http:\u002F\u002F[ip]:3000\u002F did not answer — Failed to connect to [ip] port 3000",{"segments":59},[60],{"text":61},"The application is restarting, not running. Docker reports app (Restarting (1) 4 seconds ago).",{"segments":63},[64],{"text":65},"app-1  | from ...\u002Fpublify_core-96c1f61b273e\u002Fconfig\u002Froutes.rb:3:in `\u003Ctop (required)>'",{"segments":67},[68],{"text":69},"app-1  | from ...\u002Fgems\u002Frailties-7.1.6\u002Flib\u002Frails\u002Fapplication\u002Froutes_reloader.rb:50:in `load'",{"heading":71,"steps":72,"block":76},"How to fix it",[73],[74],{"text":75},"Read the complete app container log, for example with the Engine's container service logs command, and find the first exception before the Rails stack trace. Fix the referenced routes, initializer, dependency, or required environment setting, then redeploy. Also confirm the web process binds to 0.0.0.0:3000; the current evidence primarily indicates a startup crash, not a port mismatch.",{"header":77,"lines":78},"Fix by hand",[],{"heading":80,"body":81,"block":84},"How PanelAlpha Engine solves it",[82],{"text":83},"Capture and display the first exception from the container output, rather than only the Rails backtrace. Mark this as a startup-crash failure and distinguish it from a genuine port or health-probe failure. The domain fallback also reports that the service site limit was reached, which should be surfaced separately if it blocks domain provisioning.",{"header":17,"lines":85},[],{"heading":87,"items":88},"Apps affected",[],{"heading":90,"body":91,"footNote":92,"docsLabel":93,"docsHref":94},"Try PanelAlpha Engine yourself.","The easiest way to turn your server into a safe, controlled environment for your AI agent. Deploy, manage and maintain any project from Claude Code, Cursor, Codex or any other MCP client. Open source under Apache 2.0, free to run.","Requires Ubuntu 24.04 or 26.04 · 2 GB RAM · 1 CPU","Read the documentation","https:\u002F\u002Fpanelalpha.com\u002Fdocs"]