kuberneteskubernetes-health-check

How to check the last time health check was run and the result for a Pod

Is there a way to check the last time the liveness & readyness checks are done and what are the results of the same.

I check by doing

kubectl get pod my-pod -o yaml

The status section shows up like this but does not tell when the kubelet ran the health checks

  conditions:
  - lastProbeTime: null
    lastTransitionTime: 2019-09-17T10:38:20Z
    status: "True"
    type: Initialized
  - lastProbeTime: null
    lastTransitionTime: 2019-09-17T10:38:35Z
    status: "True"
    type: Ready
  - lastProbeTime: null
    lastTransitionTime: 2019-09-17T10:38:35Z
    status: "True"
    type: ContainersReady
  - lastProbeTime: null
    lastTransitionTime: 2019-09-17T10:38:20Z
    status: "True"
    type: PodScheduled
  containerStatuses:
  - containerID: docker://<some link>
    image: nginx:latest
    imageID: someid
    lastState: {}
    name: nginx
    ready: true
    restartCount: 0
    state:
      running:
        startedAt: 2019-09-17T10:38:22Z
  hostIP: 172.18.3.8
  phase: Running```
Solution

  • A Pod is considered ready when all of its Containers are ready. One use of this signal is to control which Pods are used as backends for Services. When a Pod is not ready, it is removed from Service load balancers.The kubelet uses readiness probes to know when a Container is ready to start accepting traffic.

    you can use kubectl describe pod liveness-exec to view the pod events. The output should indicates if the liveness probes have failed. You can get more details on this from Kubernetes.io

    Additionally, a Pod has a PodStatus, which has an array of PodConditions through which the Pod has or has not passed.

    Two of the elements are