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The Dockerfile CMD was hardcoding port 3000, while Railway assigns a
dynamic PORT environment variable at runtime. Since Docker exec form
does not expand environment variables, the app was always binding to
port 3000 regardless of what port Railway expected.
Changes:
- Dockerfile: Switch CMD to shell form with sh -c so ${PORT:-3000} is
properly expanded at container startup
- railway.json: Remove redundant startCommand (Dockerfile now handles
it correctly), add healthcheckTimeout of 300s for reliability
https://claude.ai/code/session_01AQ4QvqCQqmgTLJqG5FJAcB
Railway's healthcheck connects from outside the container. serve v14 defaults to 127.0.0.1 when given just -l $PORT, making it unreachable. Explicitly binding to tcp://0.0.0.0:$PORT fixes the healthcheck failure. https://claude.ai/code/session_01AQ4QvqCQqmgTLJqG5FJAcB
npx can silently fail or stall resolving a local package in restricted Docker/Railway environments. Installing serve globally and calling it directly is simpler and more reliable. https://claude.ai/code/session_01AQ4QvqCQqmgTLJqG5FJAcB
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