Note:  For Manager Node, you must append --force  to force the node to leave the cluster. 

## 11.2.2 Initializing swarm mode 

The first node in swarm is called Manager leader. This node is responsible for advertising its IP address. In our case, we use the sc74cn03.pbm.ihost.com  (129.40.23.70) instance to act as leader. (See Example 11-2.) 

admin@570e9473805e:~$ docker swarm init --advertise-addr 129.40.23.70 Swarm initialized: current node (1xk53pdq2ujayiea2vbfu3bs1) is now a manager. To add a worker to this swarm, run the following command: docker swarm join --token SWMTKN-1-17aalrjaxjmlx43ytth47xb23enxaek0ris89826ane1d6o99z-1zzz4qvmc8bxhb2le3gulg3nx 129.40.23.70:2377 To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions. 

Note:  After issuing the preceding docker swarm init  command, the master node is defined and displays the command that allows you to add new worker nodes to the cluster. Make a note of it because we use this command in the next steps. 

Example 11-2 demonstrates a command that adds another master node into the cluster. We ran the command as instructed and Example 11-3 shows the output. 

admin@570e9473805e:~$ docker swarm join-token manager To add a manager to this swarm, run the following command: docker swarm join --token SWMTKN-1-17aalrjaxjmlx43ytth47xb23enxaek0ris89826ane1d6o99z-cafuexvwlvojqhuosk7lqe07q 129.40.23.70:2377 

## 11.2.3 Adding node manager to the cluster 

In this step, we add the second manager node to our swarm cluster. 

To join sc74cn09.pbm.ihost.com  as master node, follow these steps: 

1. Connect to sc74cn09.pbm.ihost.com  zCX instance by using ssh (in other words, ssh admin@sc74cn09.pbm.ihost.com ). 

2. Issue docker swarm join , including the token for the manager node that you got in Example 11-2. The following example shows the output: 

admin@01f543067055:~$ docker swarm join --token SWMTKN-1-17aalrjaxjmlx43ytth47xb23enxaek0ris89826ane1d6o99z-cafuexvwlvojqhuosk7lqe 07q 129.40.23.70:2377 This node joined a swarm as a manager. 

