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Adding nodes to the swarm

Once you’ve created a swarm with a manager node, you’re ready to add worker nodes.

  1. Open a new terminal and ssh into the node1, our worker node for the day
local-swarm ❯❯❯ vagrant ssh node1
...
node1:~$

Run the command produced by the docker swarm init output from the Create a swarm tutorial step to create a worker node joined to the existing swarm

node1:~$ docker swarm join \
    --token SWMTKN-1-2w490za4y94p2xjgh6ln5b57bdqc2ff9o09hh91g8z3dbxirh4-9mt0j1iaa57ti9wk9upunodn6 \
    10.0.7.100:2377
This node joined a swarm as a worker.
  1. Open a new terminal and ssh into node2, our second worker node, and run the smae docker swarm join command
node2:~$ docker swarm join \
    --token SWMTKN-1-2w490za4y94p2xjgh6ln5b57bdqc2ff9o09hh91g8z3dbxirh4-9mt0j1iaa57ti9wk9upunodn6 \
    10.0.7.100:2377
This node joined a swarm as a worker.
  1. Switch to manager and verify the cluster size (3 in this case) with docker node ls command
manager:~$ docker node ls
ID                           HOSTNAME  STATUS  AVAILABILITY  MANAGER STATUS
a6j1abnp8vb6ki98vzjc080nr    node2     Ready   Active
f7am684112gdhebg45kj61jnt    node1     Ready   Active
nxjtuxrd8mdx5975ybf7gowkh *  manager   Ready   Active        Leader

The MANAGER column identifies the manager nodes in the swarm. The empty status in this column for node1 and node2 identifies them as worker nodes.

Swarm management commands like docker node ls only work on manager nodes.