Create a swarm

After you complete the tutorial setup steps, you're ready to create a swarm. Make sure the Docker Engine daemon is started on the host machines.

  1. Open a terminal and ssh into the machine where you want to run your manager node. This tutorial uses a machine named manager1.

  2. Run the following command to create a new swarm:

    $ docker swarm init --advertise-addr <MANAGER-IP>

    In the tutorial, the following command creates a swarm on the manager1 machine:

    $ docker swarm init --advertise-addr
    Swarm initialized: current node (dxn1zf6l61qsb1josjja83ngz) is now a manager.
    To add a worker to this swarm, run the following command:
        docker swarm join \
        --token SWMTKN-1-49nj1cmql0jkz5s954yi3oex3nedyz0fb0xx14ie39trti4wxv-8vxv8rssmk743ojnwacrr2e7c \
    To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

    The --advertise-addr flag configures the manager node to publish its address as The other nodes in the swarm must be able to access the manager at the IP address.

    The output includes the commands to join new nodes to the swarm. Nodes will join as managers or workers depending on the value for the --token flag.

  3. Run docker info to view the current state of the swarm:

    $ docker info
    Containers: 2
    Running: 0
    Paused: 0
    Stopped: 2
    Swarm: active
      NodeID: dxn1zf6l61qsb1josjja83ngz
      Is Manager: true
      Managers: 1
      Nodes: 1
  4. Run the docker node ls command to view information about nodes:

    $ docker node ls
    dxn1zf6l61qsb1josjja83ngz *  manager1  Ready   Active        Leader

    The * next to the node ID indicates that you're currently connected on this node.

    Docker Engine Swarm mode automatically names the node with the machine host name. The tutorial covers other columns in later steps.

Next steps

Next, you'll add two more nodes to the cluster.