Add and remove cluster nodes

Add nodes to an MKE 4 cluster

1. Obtain the MKE configuration file for your cluster.

2. Append the host information for the new node to the hosts section of the MKE configuration file in the following format:

   - role: worker
     ssh:
       address: <address>
       keyPath: <key location>
       port: <ssh port>
       user: <username>

3. Run mkectl apply command to add the new node.

Remove nodes from an MKE 4 cluster

The method for removing nodes from an MKE cluster differs, depending on whether the node is a control plane node or a worker node.

Remove a control plane node

Refer to the k0s documentation, Remove or replace a controller for information on how to remove a control plane node from an MKE 4 cluster.

Remove a worker node

1. Delete the worker node from the cluster:

   kubectl --kubeconfig ~/.mke/mke.kubeconf delete node <worker_node_name>

2. Run the following command sequence on the node itself, to uninstall k0s:

   k0s stop
   k0s reset
   reboot

3. Obtain the MKE configuration file for your cluster.

4. Delete the host information for the deleted node from the hosts section of the MKE configuration file, to circumvent any potential mkectl issues.

5. Apply the configuration:

   mkectl apply -f <mke-configuration-file>