Restart policy

Since version 1.2 docker allows to define the restart policy of a container when it stops. The available policies are:

• restart: no, the default. The container is not restarted;

• restart: always: the container is _always_ restarted, regardless

  of its exit code;

• restart: on-failure: the container is restarted if it exits with a

  non-zero exit code.

You can also specify the number of maximum retries for restarting the container before giving up:

restart:
  name: on-failure
  retries: 3

Or as a single string (similar to Docker’s command line option):

restart: "on-failure:3"