To expand a functional cluster, you should add management hosts as master candidates and enable failover, then add remaining management hosts and compute hosts as your workload demands.
Enable master host failover
Add hosts to the cluster
Enable master host failover
Add one or more master candidates and configure them as management hosts.
Complete the steps in Install a Management Host to install and test additional management hosts.
Use the Management Console to configure the master candidate list and failover order.
Complete the steps in Set your master candidates.
Set your master candidates
You must be a cluster administrator.
You can modify the order of the hosts in the candidate list (this is the list which specifies the management host(s) in line to become the new master in situations where the existing master host becomes unavailable). You can also change the master host.
Click Cluster > Configure Master Candidates.
To add hosts to your candidate list, select one or more hosts and click Add.
Use SHIFT or CTRL while you are clicking to select more than host at a time.
To remove any hosts from the candidate list, click the host name and Remove.
You cannot remove the master host from this list. The master host is at the top of the list by default when you navigate to this page.
Change the order of the candidates using Up and Down.
You can move the master host from the top of the list, however you cannot remove master host from the list.
When you have the hosts you want in the order you want, click Apply.
Changing and saving the order of your candidates restarts your cluster.
The hosts you want as master and master candidates are now set in the order you want them to failover. Your cluster automatically restarts so the changes take effect.
Add hosts to the cluster
Complete the following steps to add more hosts to your cluster:
Repeat the steps in Install a Management Host to install and test additional management hosts.
Repeat the steps in Install a Compute Host to install and test additional compute hosts.