A Liberty profile can be configured into a server cluster
for application high availability and scale.
Note: The
collectiveController-1.0 feature and its
capabilities are available only in IBM® WebSphere® Application
Server Liberty Network Deployment.
The feature
is not available in IBM WebSphere Application Server
Liberty, IBM WebSphere Application Server Liberty - Express®, or IBM WebSphere Application Server Liberty Core.
A Liberty server cluster is comprised of two or more Liberty
profiles configured into a server cluster within a Liberty collective.
A Liberty server cluster has a unique name within the collective.
The
collectiveController-1.0 feature supports several
operations on Liberty server clusters through the
ClusterManager MBean:
- List clusters
- Start cluster
- Stop cluster
- List cluster members
- Generate cluster plug-in configuration
To be part of a server cluster, a Liberty profile must
be a member of a Liberty collective and also be configured with the clusterMember feature.
A collective member can be
a member of only one server cluster. All cluster members must be
members of the same collective. Multiple server clusters can be configured
within the same collective. The following diagram illustrates these
relationships.
Figure 1. Liberty
profile server clusters