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I am using Docker version 17.09.0-ce, and I see that containers are marked as unhealthy. Is there an option to get the container restart instead of keeping the container as unhealthy?
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If a health check fails but the subsequent one passes, the container will not transition to unhealthy . It will become unhealthy after three consecutive failed checks. --timeout – Set the timeout for health check commands. Docker will treat the check as failed if the command doesn't exit within this time frame.
That unhealthy status is published as an event from Docker's API, so the platform running the container is notified and can take action to fix the application. Docker also records the result of the most recent health checks, which you can see when you inspect the container.
Docker also lets the user set the restart policy upon exit or failure. Users can type docker ps to check if the restart policy is active; it will be shown as either Up , when the container is up and running, or Restarting when the container is in the restart state.
A restart policy only takes effect after a container starts successfully. In this case, starting successfully means that the container is up for at least 10 seconds and Docker has started monitoring it. This prevents a container which does not start at all from going into a restart loop.
Restarting of unhealty container feature was in the original PR (https://github.com/moby/moby/pull/22719), but was removed after a discussion and considered to be done later as enhancement of RestartPolicy.
At this moment you can use this workaround to automatically restarting unhealty containers: https://hub.docker.com/r/willfarrell/autoheal/
Here is a sample compose file:
version: '2' services: autoheal: restart: always image: willfarrell/autoheal environment: - AUTOHEAL_CONTAINER_LABEL=all volumes: - /var/run/docker.sock:/var/run/docker.sock Simply execute docker-compose up -d on this
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