RKE supports adding/removing nodes for worker and controlplane hosts.
In order to add additional nodes, you update the original
cluster.yml file with any additional nodes and specify their role in the Kubernetes cluster.
In order to remove nodes, remove the node information from the nodes list in the original
After you’ve made changes to add/remove nodes, run
rke up with the updated
Adding/Removing Worker Nodes
You can add/remove only worker nodes, by running
rke up --update-only. This will ignore everything else in the
cluster.yml except for any worker nodes.
Note: When using
--update-only, other actions that do not specifically relate to nodes may be deployed or updated, for example addons.
Removing Kubernetes Components from Nodes
In order to remove the Kubernetes components from nodes, you use the
rke remove command.
Warning: This command is irreversible and will destroy the Kubernetes cluster, including etcd snapshots on S3. If there is a disaster and your cluster is inaccessible, refer to the process for restoring your cluster from a snapshot.
rke remove command does the following to each node in the
- Remove the Kubernetes component deployed on it
The cluster’s etcd snapshots are removed, including both local snapshots and snapshots that are stored on S3.
Note: Pods are not removed from the nodes. If the node is re-used, the pods will automatically be removed when the new Kubernetes cluster is created.
- Clean each host from the directories left by the services: