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Master Nodes

Addition or removal of master nodes from the controller-provisioned and managed clusters is possible as a Day 2 operational task

Important

This workflow is supported for manually provisioned clusters.

Manually Provisioned Clusters

Add Master Nodes

  • Create required VMs or instances
  • Sign into the Web Console
  • Select the cluster and click on nodes. Here you can view a visual representation displaying the count of nodes categorized by their respective statuses and k8s version of each node (highlighted in different colors)
  • Click "Add Node" and Follow the Node Installation Instructions to install the bootstrap agent on the VM

Add Master Manually

Users can optionally enable "auto approval" for new master nodes to join the cluster. Enable the auto approval "toggle" in the cluster configuration page as shown in the screenshot below.

Auto Approve Nodes

  • Click on "Configure" to configure the node with Master Role so that it can be joined as a master node to the cluster
  • Click Save

Configure Master Nodes

  • In the Nodes page, click Provision Approved/Failed Nodes button to provision all the Approved/ Provision Failed / Pretest Failed nodes simultaneously

Confirm Master Nodes

Important

If the approval process fails for a node, it is automatically retried when an add operation is triggered for another node, with failures typically caused by connectivity issues

  • It will take couple minutes for the additional master node to be provisioned

Provision Master Nodes

  • Once the node is provisioned, it will join the cluster with the Master role

Complete Master Nodes

Complete Master Nodes

When all nodes have been provisioned, and there are no pending nodes for provisioning, the Provision Approved/Failed Nodes button will not be available on this page.

Important

On Day 2, post-cluster creation, master nodes must be added sequentially, with each node provisioned successfully before proceeding to the next, to prevent any provisioning issues

Cordon/Uncordon UX

Cordon/Uncordon/Drain Nodes

Management of node scheduling through the controller UI allows the users to quickly change the status of master nodes:

  • Click the ellipsis button of a specific node
  • To mark node(s) as unschedulable, select Cordon and Yes
  • To mark the node(s) as schedulable again, allowing new pods to be assigned to it, select Uncordon and click Yes
  • To drain the node and remove all the running pods, select Drain and click Yes

Delete Master

Refer to this page for instructions on how to cordon, drain, or uncordon via the CLI and this page for instructions on how to cordon, drain, or uncordon via the API.

Delete Master Nodes

  • Select the cluster and click on Nodes tab
  • Click the ellipsis button next to the node you want to delete
  • Click Delete and Yes to confirm the deletion

Force Delete

  • Enabling the Force Delete option immediately deletes an MKS node, overriding any ongoing operations or errors that might otherwise block the deletion process.

Delete Master

  • Once the process is kicked off, the controller will drain the node by rescheduling pods on other nodes and then remove the master node from the cluster
  • When the node deletion is done, the master node will be removed from the cluster

Important

For manually provisioned clusters, it is the customer's responsibility to deprovision the VM or Instance after deleting the master node from the cluster.