How to remove node from swarm?

Question

I added three nodes to a swarm cluster with static file mode. I want to remove host1 from the cluster. But I don't find a docker swarm remove command:

Usage: swarm [OPTIONS] COMMAND [arg...]
Commands:
  create, c Create a cluster
  list, l   List nodes in a cluster
  manage, m Manage a docker cluster
  join, j   join a docker cluster
  help, h   Shows a list of commands or help for one command

How can I remove the node from the swarm?

Answer 1

Using Docker Version: 1.12.0, docker help offers:

➜  docker help swarm

Usage:  docker swarm COMMAND

Manage Docker Swarm

Options:
      --help   Print usage

Commands:
  init        Initialize a swarm
  join        Join a swarm as a node and/or manager
  join-token  Manage join tokens
  update      Update the swarm
  leave       Leave a swarm

Run 'docker swarm COMMAND --help' for more information on a command.

So, next try:

➜  docker swarm leave --help

Usage:  docker swarm leave [OPTIONS]

Leave a swarm

Options:
      --force   Force leave ignoring warnings.
      --help    Print usage

Answer 2

Using the swarm mode introduced in the docker engine version 1.12, you can directly do docker swarm leave.