Check the Primary and Controller Node Conditions

To get the health status of the primary and controller nodes, you must run osctl describe node <node>.

Symptoms

The health check can report a failure when something like the following occurs and show unhealthy status like DiskPressure, and so on.

For example:

#osctl describe node controller-xxxx
Conditions:
  Type                 Status  LastHeartbeatTime                 LastTransitionTime                Reason                       Message
  ----                 ------  -----------------                 ------------------                ------                       -------
  NetworkUnavailable   False   Sat, 05 Jun 2021 10:47:53 +0000   Sat, 05 Jun 2021 10:47:53 +0000   CalicoIsUp                   Calico is running on this node
  MemoryPressure       False   Mon, 07 Jun 2021 01:21:55 +0000   Mon, 07 Jun 2021 00:57:29 +0000   KubeletHasSufficientMemory   kubelet has sufficient memory available
  DiskPressure         False   Mon, 07 Jun 2021 01:21:55 +0000   Mon, 07 Jun 2021 00:57:29 +0000   KubeletHasNoDiskPressure     kubelet has no disk pressure
  PIDPressure          False   Mon, 07 Jun 2021 01:21:55 +0000   Mon, 07 Jun 2021 00:57:29 +0000   KubeletHasSufficientPID      kubelet has sufficient PID available
  Ready                True    Mon, 07 Jun 2021 01:21:55 +0000   Mon, 07 Jun 2021 00:57:32 +0000   KubeletReady                 kubelet is posting ready status

Solution

MemoryPressure