Uninstall UCP

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Docker UCP is designed to scale as your applications grow in size and usage. You can add and remove nodes from the cluster, to make it scale to your needs.

You can also uninstall Docker Universal Control Plane from your cluster. In this case the UCP services are stopped and removed, but your Docker Engines will continue running in swarm mode. You applications will continue running normally.

If you wish to remove a single node from the UCP cluster, you should instead Remove that node from the cluster.

After you uninstall UCP from the cluster, you’ll no longer be able to enforce role-based access control to the cluster, or have a centralized way to monitor and manage the cluster.

After uninstalling UCP from the cluster, you will no longer be able to join new nodes using docker swarm join unless you reinstall UCP.

To uninstall UCP, log in to a manager node using ssh, and run the following command:

$ docker run --rm -it \
  -v /var/run/docker.sock:/var/run/docker.sock \
  --name ucp \
  docker/ucp:2.1.4 uninstall-ucp --interactive

This runs the uninstall command in interactive mode, so that you are prompted for any necessary configuration values. Running this command on a single manager node will uninstall UCP from the entire cluster. Check the reference documentation to learn the options available in the uninstall-ucp command.

Swarm mode CA

After uninstalling UCP, the nodes in your cluster will still be in swarm mode, but you cannot join new nodes until you reinstall UCP, because swarm mode was relying on UCP to provide the CA certificates that allow nodes in the cluster to identify each other. Additionally, since swarm mode is no longer controlling its own certificates, if the certificates expire after you uninstall UCP the nodes in the cluster will not be able to communicate at all. To fix this, either reinstall UCP before the certificates expire or disable swarm mode by running docker swarm leave --force on every node.

Where to go next

docker, ucp, uninstall