Self-Healing Containers with Restart Policies
Learn how to use the container restart policies to ensure the smooth functioning of containers.
We'll cover the following...
We'll cover the following...
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 ...