Add HEALTHCHECK instruction to Dockerfile
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The `Dockerfile` currently does not have a `HEALTHCHECK` instruction. Users of the Docker image currently need to add it manually (e.g. via Docker Compose). Instead, the `Dockerfile` itself should include the instruction. To determine whether the service is healthy, one can use the [`pg_isready`](https://www.postgresql.org/docs/current/app-pg-isready.html) program, which is already part of the image. The program “checks the connection status of a PostgreSQL database server”. Most of the default `HEALTHCHECK` [options](https://docs.docker.com/reference/dockerfile/#healthcheck) seem reasonable: ``` --interval=30s --timeout=30s --start-interval=5s --retries=3 ``` I set `--start-period=1s` because the default of `0s` is too quick for this program. Users of the image can still override the `HEALTHCHECK` instruction if they want to customize the command or the options.
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The
Dockerfilecurrently does not have aHEALTHCHECKinstruction. Users of the Docker image currently need to add it manually (e.g. via Docker Compose). Instead, theDockerfileitself should include the instruction.To determine whether the service is healthy, one can use the
pg_isreadyprogram, which is already part of the image. The program “checks the connection status of a PostgreSQL database server”.Most of the default
HEALTHCHECKoptions seem reasonable:I set
--start-period=1sbecause the default of0sis too quick for this program.Users of the image can still override the
HEALTHCHECKinstruction if they want to customize the command or the options.