How to auto restart a Docker container after a reboot in CoreOS?

For people want to auto restart a docker container, but didn't specify --restart flag (default to 'no') while running it, you can use docker update command to add one of the following three other options:

• on-failure
• unless-stopped
• always

See this post for the details. People have problem with always restart flag on, can consider using either on-failure or unless-stoppedoption.

CoreOS uses systemd to manage long running services:

• https://coreos.com/os/docs/latest/getting-started-with-systemd.html

What worked for me is to add --restart='always' to the container {run -d ...} command

if you start the daemon with docker -d -r, it will restart all containers that were running prior the daemon stopped. This will become the default behavior in the next release.