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moby--moby/docs/reference/commandline/swarm_init.md

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swarm init

Usage:	docker swarm init [OPTIONS]

Initialize a Swarm.

Options:
      --auto-accept value   Acceptance policy (default [worker,manager])
      --external-ca value   Specifications of one or more certificate signing endpoints
      --force-new-cluster   Force create a new cluster from current state.
      --help                Print usage
      --listen-addr value   Listen address (default 0.0.0.0:2377)
      --secret string       Set secret value needed to accept nodes into cluster

Initialize a Swarm cluster. The docker engine targeted by this command becomes a manager in the newly created one node Swarm cluster.

$ docker swarm init --listen-addr 192.168.99.121:2377
Swarm initialized: current node (1ujecd0j9n3ro9i6628smdmth) is now a manager.
$ docker node ls
ID                           NAME      MEMBERSHIP  STATUS  AVAILABILITY  MANAGER STATUS          LEADER
1ujecd0j9n3ro9i6628smdmth *  manager1  Accepted    Ready   Active        Reachable               Yes

--auto-accept value

This flag controls node acceptance into the cluster. By default, both worker and manager nodes are auto accepted by the cluster. This can be changed by specifing what kinds of nodes can be auto-accepted into the cluster. If auto-accept is not turned on, then node accept can be used to explicitly accept a node into the cluster.

For example, the following initializes a cluster with auto-acceptance of workers, but not managers

$ docker swarm init --listen-addr 192.168.99.121:2377 --auto-accept worker
Swarm initialized: current node (1m8cdsylxbf3lk8qriqt07hx1) is now a manager.

--external-ca value

This flag sets up the swarm to use an external CA to issue node certificates. The value takes the form protocol=X,url=Y. The value for protocol specifies what protocol should be used to send signing requests to the external CA. Currently, the only supported value is cfssl. The URL specifies the endpoint where signing requests should be submitted.

--force-new-cluster

This flag forces an existing node that was part of a quorum that was lost to restart as a single node Manager without losing its data

--listen-addr value

The node listens for inbound Swarm manager traffic on this IP:PORT

--secret string

Secret value needed to accept nodes into the Swarm

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