How do I upgrade my Docker Swarm cluster?
To upgrade your Docker Swarm cluster, you need to update the Docker Engine on each node. Start with the manager nodes.
What commands do I need to run on the manager nodes?
You can use docker node ls
to list the nodes, then run apt-get update
and apt-get install docker-ce
to upgrade.
Do I need to drain the nodes before upgrading?
Yes, it's a good practice to drain the nodes using docker node update --availability drain <node-name>
before upgrading.
How can I verify the upgrade was successful?
After upgrading, you can check the version with docker version
on each node to ensure they are all updated.
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