Scale In Kubernetes Cluster¶
EKF already seamlessly supports scaling a Kubernetes cluster in and out
automatically, according to demand. It uses a modified version of the Cluster
Autoscaler, which works with local volumes, including Rok volumes. You no longer
need to run
rok-k8s-drain manually to scale in a cluster, since the Cluster
Autoscaler will scale in the cluster seamlessly, according to its configuration.
However, if you need to force the cluster to scale in a cluster to a desired
size immediately, you can still use the
rok-k8s-drain tool directly.
Like Cluster Autoscaler, the
rok-k8s-drain tool is cloud aware, i.e., it
needs to be aware of the properties of the cloud it operates on and the
underlying structures that comprise a node group.
rok-k8s-drain currently supports scaling-in only EKS clusters.
Verify that the cluster has been scaled-down, by listing the nodes:
root@rok-tools:~# kubectl get nodes