docker node demote
Demote one or more nodes from manager in the swarm
Swarm This command works with the Swarm orchestrator.
docker node demote NODE [NODE...]
Demotes an existing manager so that it is no longer a manager.
This is a cluster management command, and must be executed on a swarm manager node. To learn about managers and workers, refer to the Swarm mode section in the documentation.
$ docker node demote <node name>