The Federated Caching feature federates cached data asynchronously across multiple geographically dispersed clusters. Cached data is federated across clusters to provide redundancy, off-site backup, and multiple points of access for application users in different geographical locations.
This sample shows how to set up two Federated Coherence clusters across separate Kubernetes clusters.
Note: To set up two Federated Coherence clusters within a single Kubernetes cluster, refer to the additional information here.
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Follow the steps described in Federation Within a Single Kubernetes Cluster, with the following changes:
Expose port 40000 on each cluster to a visible IP or load balancer.
You must expose the cluster port 40000 (or an alternative) via an IP directly or via load balancer on each cluster. This allows the clusters to communicate.
Refer to the Kubernetes documentation for more information.
Ignore any port-forward commands.
Install the Coherence clusters.
Once you have an IP/PORT for each cluster, you must change the following in the
--set store.javaOpts option in the installation steps 2 and 4:
priamry.cluster.host - The external IP of the primary cluster
primary.cluster.port - The external port (default to 40000) of the primary cluster
secondary.cluster.host - The external IP of the secondary cluster
secondary.cluster.port - The external port (default to 40000) of the secondary cluster
Eg.
--set store.javaOpts="-Dprimary.cluster=PrimaryCluster -Dprimary.cluster.port=40000 -Dprimary.cluster.host=PRIMARY-CLUSTER-IP -Dsecondary.cluster=SecondaryCluster -Dsecondary.cluster.port=40000 -Dsecondary.cluster.host=SECONDARY-CLUSTER-IP" \