Leave the swarm
Swarm This command works with the Swarm orchestrator.
$ docker swarm leave [OPTIONS]
Refer to the options section for an overview of available OPTIONS for this command.
When you run this command on a worker, that worker leaves the swarm.
You can use the --force option 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.
For example uses of this command, refer to the examples section below.
| Name, shorthand | Default | Description | 
| --force,-f | Force this node to leave the swarm, ignoring warnings | 
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.
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.
| Command | Description | 
|---|---|
| docker swarm | Manage Swarm | 
| Command | Description | 
| docker swarm ca | Display and rotate the root CA | 
| docker swarm init | Initialize a swarm | 
| docker swarm join | Join a swarm as a node and/or manager | 
| docker swarm join-token | Manage join tokens | 
| docker swarm leave | Leave the swarm | 
| docker swarm unlock | Unlock swarm | 
| docker swarm unlock-key | Manage the unlock key | 
| docker swarm update | Update the swarm | 
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    https://docs.docker.com/engine/reference/commandline/swarm_leave/