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agent-host-roles.adoc

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Host roles

Each host in the cluster is assigned a role of either master or worker. You can define the role for each host in the agent-config.yaml file by using the role parameter. If you do not assign a role to the hosts, the roles will be assigned at random during installation.

It is recommended to explicitly define roles for your hosts.

The rendezvousIP must be assigned to a host with the master role. This can be done manually or by allowing the Agent-based Installer to assign the role.

Important

You do not need to explicitly define the master role for the rendezvous host, however you cannot create configurations that conflict with this assignment.

For example, if you have 4 hosts with 3 of the hosts explicitly defined to have the master role, the last host that is automatically assigned the worker role during installation cannot be configured as the rendezvous host.
Sample agent-config.yaml file
apiVersion: v1beta1
kind: AgentConfig
metadata:
  name: example-cluster
rendezvousIP: 192.168.111.80
hosts:
  - hostname: master-1
    role: master
    interfaces:
      - name: eno1
        macAddress: 00:ef:44:21:e6:a5
  - hostname: master-2
    role: master
    interfaces:
      - name: eno1
        macAddress: 00:ef:44:21:e6:a6
  - hostname: master-3
    role: master
    interfaces:
      - name: eno1
        macAddress: 00:ef:44:21:e6:a7
  - hostname: worker-1
    role: worker
    interfaces:
      - name: eno1
        macAddress: 00:ef:44:21:e6:a8