Usage: docker swarm leave [OPTIONS] Leave the swarm Options: -f, --force Force this node to leave the swarm, ignoring warnings --help Print usage
When you run this command on a worker, that worker leaves the swarm.
You can use the --force option to on a manager to remove it from the swarm. However, this does not reconfigure the swarm to ensure that there are enough managers to maintain a quorum in the swarm. The safe way to remove a manager from a swarm is to demote it to a worker and then direct it to leave the quorum without using --force. Only use --force in situations where the swarm will no longer be used after the manager leaves, such as in a single-node swarm.
Consider the following swarm, as seen from the manager:
$ docker node ls ID HOSTNAME STATUS AVAILABILITY MANAGER STATUS 7ln70fl22uw2dvjn2ft53m3q5 worker2 Ready Active dkp8vy1dq1kxleu9g4u78tlag worker1 Ready Active dvfxp4zseq4s0rih1selh0d20 * manager1 Ready Active Leader
To remove worker2, issue the following command from worker2 itself:
$ docker swarm leave Node left the default swarm.
To remove an inactive node, use the node rm command instead.
The node will still appear in the node list, and marked as down. It no longer affects swarm operation, but a long list of down nodes can clutter the node list. To remove an inactive node from the list, use the node rm command.