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The nc included in the busybox of Alpine can't be used to do health check reliably as it reports exit code 1 when the server closes immediately (because no data was sent). If you need nc -z to behave “as expected,” replace BusyBox with OpenBSD netcat This gist shows how.
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| # nc included in the busybox of Alpine can't be used to do health check as it | |
| # reports exit code 1 when the server closes immediately (because no data was sent). | |
| # If you need nc -z to behave “as expected,” replace BusyBox with OpenBSD netcat: | |
| apk add netcat-openbsd # Alpine | |
| apt install netcat-openbsd # Debian/Ubuntu | |
| # Then nc -z localhost 31311 will succeed if the connect() call works. |
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