High CPU Utilization under %steal makes control plane unstable

Solution Unverified - Updated

Issue

Control Plane nodes become unstable when there is high cpu utilization under %steal.

Resolution

  • Engage your hypervisor team to cross verify the hypervisor resources [physical] allocated and cpu/cores allocated to VM's.
  • Ask them to share the detailed analysis and opinion on this.

Root Cause

  • Hypervisor is overcommiting cpu resources which is leading to high cpu utilization under %st (steal time) on all master vm's.

  • Also resulting in high load average reported on them.

  • Due to this unusual resource tilization on VM's oc commands are failing and login to cluster is also failing through oc command and console.

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