health check

[bryan-gilbert]

I'm seeking a health check to verify if postfix is running. The following is something I developed that seems to work.

Might you consider adding the following to your project's sample docker compose file or to your documentation?

d-c.yml

version: '3'
services:
  postfix:
    image: boky/postfix
    expose:
      - "587"
    environment:
      - DKIM_AUTOGENERATE=1
      - ALLOWED_SENDER_DOMAINS
    restart: always
    volumes:
      - "./dkimkeys:/etc/opendkim/keys"
    healthcheck:
      test: netstat -l | grep smtp
      interval: 1m
      timeout: 10s
      retries: 3

The healthcheck uses netstat, which is installed in the linux image used by this project. Ask netstat to list all listening ports. Use grep to see if something (e.g. postfix) is listening on the smtp port. Grep returns 0 exit code if it finds a match and 1 when there is no match.

[bokysan]

This is a good idea. I already have healtchecks in the helm chart but would make sense to add them to Dockerfile via HEALTHCHECK directive as well.

That way you wouldn't need to specify them individually in docker-compose.yml.

If fixing, I should probably add a bit more elaborate check.

[bokysan]

The new Dockerfile includes the directive. This is now resolved in master and will be released with the new version soon.