If you want to add a manager to the cluster, you need to do the following:

• On an existing manager, run the following command:

    $ docker swarm join-token manager
    To add a manager to this swarm, run the following command:

    docker swarm join --token SWMTKN-1-0trltcq6gwhz9w40j3wpuqedjwviwdgksuz8zulaz6qon118s4-2ui4f15uu7ceow6k2gc9xutb5 10.10.0.6:2377

• Log in to the potential new manager host, and run the command from above:

    $ docker swarm join --token SWMTKN-1-0trltcq6gwhz9w40j3wpuqedjwviwdgksuz8zulaz6qon118s4-2ui4f15uu7ceow6k2gc9xutb5 10.10.0.6:2377

    This node joined a swarm as a manager.