Cannot operate services when a container is detached

I am maintaining a Docker image that utilizes dumb-init to spawn processes. Recently I found that I cannot manage services in docker container anymore.

This works well when a container is running in foreground.

docker run --rm -uroot -it attr/drupal-lemp service nginx stop
[ ok ] Stopping nginx: nginx.

However whey I use drush run -d + drush exec it fails.

docker run --name=c1 -d attr/drupal-lemp && docker exec -uroot c1 service nginx stop
d4d38832ec1b896faa65631ba324b4bfb5335ddd0e4bfced3a8caab750c94142
Stopping nginx: nginx failed!

This might happen because the dumb-init is started by unprivileged user with sudo. I had to add sudo there because Docker does not allow to set USER after CMD.

[asottile]

You’ll want to use some sort of service manager such as runit / supervisord

[Chi-teck]

Thanks, I’will take a look at runit.