In very large infrastructures, high availability and redundancy are important requirements. Fortunately, Salt has support for redundant Salt masters that provide a level of redundancy and also a means to scale the infrastructure to support large deployments.
We will use our existing Salt master, but rename it to salt-master-1 from salt-master. Also, configure a second Salt master called salt-master-2 by following the Installing and configuring the Salt master and Configuring the Salt environment and pillar paths recipes from Chapter 1, Salt Architecture and Components.
The second node will be configured in the exact same way as the first one. After installing the salt-master package, copy over the following files and directories from salt-master-1 to the exact same locations in salt-master-2.
Create the directories if they do not exist:
/etc/salt/master/etc/salt/autosign.conf/etc/salt/pki/master/master.pem/etc/salt/pki/master/master...