Red Hat Certified Specialist in High Availability Clustering exam Free Sample Questions

In RHEL 8 and 9, the command to authenticate nodes for the pcsd daemon is pcs host auth. The older syntax (pcs cluster auth) was deprecated and replaced to better reflect that the authentication happens at the host level before the cluster is formally created.

The ha_cluster system role uses specific variable naming conventions. ha_cluster_cluster_name is required to define the name of the Corosync cluster.

The ha_cluster_hacluster_password variable is explicitly used by the ha_cluster role to set the password for the hacluster user on all nodes, which is necessary for pcsd authentication.

In a two-node cluster, strict majority voting is impossible. Setting two_node=1 tells votequorum to allow a single node to retain quorum, but ONLY if it can successfully fence the other node. This race condition ensures that only the node that wins the fencing race survives and mounts the storage, preventing split-brain.

False. By default, standard votequorum requires a strict majority (>50% of total votes) to operate. In a 3-node cluster, 2 votes are required for quorum. If two nodes fail, the single remaining node has only 1 vote and will lose quorum, stopping all resources to prevent data corruption.

The pcs cluster destroy command permanently removes the cluster configuration files (like corosync.conf) and stops the cluster services, effectively wiping the node's cluster state.

STONITH (fencing) is the only definitive way to ensure a non-responsive node is actually powered off or physically disconnected. This guarantees it cannot write to shared storage, thereby preventing split-brain data corruption.