Cluster Configuration

Upon agent installation, the node is considered part of its own 1-node cluster. The following configuration is merged in <OSVCETC>/node.conf:

cluster.secret is auto-generated, if not already defined.

cluster.name is set to default, if not already defined.

Bootstrap a new cluster

If the node joins an existing cluster, skip this section.

Add Heartbeats

On a new cluster, the heartbeats configuration need to be applied only on the first node. The joining nodes will fetch this configuration from this joined node.

For example, the simplest heartbeat configuration would be

sudo nodemgr set --param hb#1.type --value unicast

Display the result

sudo svcmon

See also

Agent Heartbeats

Add Stonith methods

Stonith is optional. Skip to the next section if not concerned.

On a new cluster, the stonith configuration can be applied on the first node. The joining nodes will fetch this configuration from this joined node.

For example, a dummy stonith configuration would be

sudo nodemgr set --param stonith#node2.cmd --value /bin/true

This configuration will execute /bin/true on the node taking over a service which was previously running on the now stalled node2.

Good, isolated fencing packages are freely available. For one, https://github.com/ClusterLabs/fence-agents

Join a Cluster

The joining node can choose to join any of the cluster node already joined.

On the joined node node1

sudo nodemgr get --param cluster.secret

On the joining node node2

sudo nodemgr daemon join --secret <secret> --node node1

Note

  • If the node was frozen before the join, it is left frozen after the join.
  • If the node was not frozen before the join, the join process freezes it. If the join is successful, the node is thawed. If not, the node is left frozen.