Self-Healing Containers with Restart Policies
Learn how to use the container restart policies to ensure the smooth functioning of containers.
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Container restart policies are a simple form of self-healing that allows the local Docker Engine to automatically restart failed containers.
Restart policies
We apply restart policies per container, and Docker supports the following four policies:
no(default)on-failurealwaysunless-stopped
The following table shows how each policy reacts to different scenarios. A “Y” indicates the policy will attempt a container restart, whereas an “N” indicates it won’t.
Restart Policy | Non-Zero Exit Code | Zero Exit Code | The | Restarts When Daemon Restarts |
No | N | N | N | N |
On-Failure | Y | N | N | Y |
Always | Y | Y | N | Y |
Unless-Stopped | Y | Y | N | N |
Non-zero exit codes indicate a failure occurred. Zero exit ...