TKG Cluster showing 'Warning' status in TMC due to 'Unknown' nodes

Products

• VMware Tanzu Mission Control
• VMware Tanzu Kubernetes Grid Service (TKGs)
• VMware Tanzu Kubernetes Grid Management

Issue/Introduction

• In TMC GUI, the Guest Cluster will show a yellow Warning status.
• After selecting the cluster, from the Nodes tab, 1 or more than 1 nodes report 'Unknown' state.

Environment

This might appear in vSphere with Tanzu / TKGS or TKGm clusters.

Cause

This is caused by the node reporting Ready:False or Unknown state to the TKG Control Plane nodes. The best way to identify what is causing the failure is to run the 'kubectl get nodes' command  from the TKC's control plane context. Then describe the node that shows NotReady status to identify why it is reporting NotReady.

Resolution

Depending on the cause of the NotReady status, the node might be corrected with manual intervention, or it may require recreation depending on the failure state. Review KB 379071 for details on why a worker node might enter NotReady state.