moby/docs/swarm/swarm-tutorial/create-swarm.md

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. For example, the tutorial uses a machine named manager1.

2. Run docker swarm init --listen-addr MANAGER-IP:PORT to create a new Swarm.

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

   $ docker swarm init --listen-addr 192.168.99.100:2377
   
   Swarm initialized: current node (09fm6su6c24qn) is now a manager.
   

   The --listen-addr flag configures the manager node to listen on port 2377. The other nodes in the Swarm must be able to access the manager at the IP address.

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

    $ docker info
   
    Containers: 2
     Running: 0
     Paused: 0
     Stopped: 2
    ...snip...
    Swarm:
     NodeID: 09fm6su6c24qn
     IsManager: YES
     Managers: 1
     Nodes: 1
    ...snip...
   

4. Run the docker node ls command to view information about nodes:

   $ docker node ls
   
   ID              NAME      MEMBERSHIP  STATUS  AVAILABILITY  MANAGER STATUS  LEADER
   09fm6su6c24q *  manager1  Accepted    Ready   Active        Reachable       Yes
   
   

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

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

What's next?

In the next section of the tutorial, we'll add two more nodes to the cluster.