Testing Proxmox HA configuration

To test whether the HA is really working, we will disconnect the network connectivity for the node pm4-1 and observe the Status window for HA changes. The Status window displays the states of resources in real time as they occur. The following screenshot shows the HA status after interrupting the network connectivity:

In the preceding screenshot, we can see that our example node pm4-1 is no longer connected to the cluster, and HA does not get any acknowledgement from the node. After 60 seconds, Proxmox HA promotes the next available node in the HA group as the master, as shown in the following screenshot:

After Proxmox HA promotes a new master for the HA group, it then starts fencing the VM resources to prepare them in order to move them to another node. During fencing, all services related to the VM are fenced, which means that even if the failed node comes back online at this stage, the VM will not be able to resume its normal operation. The following screenshot...