K10 multi-cluster manager enables licensing all clusters in the same multi-cluster system with a single license. This can be achieved by installing a single license on the primary cluster, which will then distribute license leases to secondary clusters. Any excess license capacity from licenses installed on secondary clusters, will be contributed to a global pool of licenses maintained by the primary cluster.
License Sharing Model
When Multi-Cluster license management is enabled, a cluster can contribute its excess license capacity to the multi-cluster license pool. The excess license capacity is the difference between the sum of node limits of valid licenses installed in the cluster and the number of worker nodes in the cluster. Clusters that do not have sufficient licenses will use the Multi-Cluster license pool to meet the licensing requirements.
E.g. There are two clusters, A and B, in a Multi-Cluster system, with 4 and 5 worker nodes, respectively. A license for 10 nodes is installed in cluster A, and cluster B has no licenses. The 10 node license covers the 4 nodes in cluster A, and there is an excess license capacity of 6 (= 10 - 4) on this cluster. This excess license capacity can be leased by cluster B to meet its license requirement for 5 nodes. Both clusters are licensed with a single license in cluster A.
Enabling Multi-Cluster License Management
To enable Multi-Cluster license management, the primary cluster needs to be setup with an ingress, which the secondary clusters are able to connect to.
When deploying a new multi-cluster system, the ingress may be set using Setup-Primary Command. If an ingress was not specified when setting up the primary, the ingress may be set by rerunning the setup command or by editing the Cluster resource directly. See Upgrading for details.
When Multi-Cluster license management is enabled, a Multi-Cluster Lease will be available on each clusters K10 dashboard's Settings -> Licenses page. This lease is valid for an hour, and clusters will connect to the primary cluster to renew the lease prior to expiry.
Example lease of a cluster leasing from the Multi-Cluster license pool:
Example lease of a cluster contributing to the Multi-Cluster license pool:
K10 multi-cluster dashboard's Global K10 Resources -> Licensing page provides the cumulative license capacity of the Multi-Cluster system, and the cumulative number of worker nodes licensed in the Multi-Cluster system.