Why "|| exit 1"?

[cowlike]

Continuing the discussion from HEALTCHECK command, curl command and HTTP status codes:

@meyay

The exit code of the last command is relevant and either needs to be 0 (=passed) or 1 (=failed).

Does the exit code really need to be 1 on failure instead of any non-zero value? Normally any non-zero value indicates failure so I don’t see why this is necessary.

[meyay (Metin Y.)]

No problem, I googled the docs for you using the search terms “docker healthcheck”.

This is a quote from the first result:

@https://docs.docker.com/engine/reference/builder/#healthcheck

The command’s exit status indicates the health status of the container. The possible values are:

• 0: success - the container is healthy and ready for use
• 1: unhealthy - the container isn’t working correctly
• 2: reserved - don’t use this exit code