docker node demote

Usage:  docker node demote NODE [NODE...]

Demote one or more nodes from manager in the swarm

Options:
      --help   Print usage

Demotes an existing manager so that it is no longer a manager. This command targets a docker engine that is a manager in the swarm.

$ docker node demote <node name>

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https://docs.docker.com/v1.12/engine/reference/commandline/node_demote/