To make your infrastructure more resilient and redundant, you can create a high availability (HA) configuration of three nodes.
Management node HA and compute cluster are tightly coupled, so changing nodes in one usually affects the other. Take note of the following:
- All nodes in the HA configuration will be added to the compute cluster.
- Single nodes cannot be removed from the compute cluster as they are included in the HA configuration. In such a case, the compute cluster can be destroyed completely, but the HA configuration will remain. This is also true vice versa, the HA configuration can be deleted, but the compute cluster will continue working.
To enable high availability for the management node and admin panel, do the following:
On the Settings > Management node screen, open the Management high availability tab.
Select three nodes, and then click Create HA. The management node is automatically selected.
On Configure network, verify that the correct network interfaces are selected on each node. Otherwise, click the cogwheel icon for a node and assign networks with the Internal management and Admin panel traffic types to its network interfaces. Click Proceed.
On Configure network, provide one or more unique static IP addresses for the highly available admin panel, compute API endpoint, and interservice messaging. Click Done.
Once the high availability of the management node is enabled, you can log in to the admin panel at the specified static IP address (on the same port 8888).