Self Healing - Liveness

Liveness Probe

Lets assume the application failed after readiness probe execution completes Again we are back to service unavailability

To avoid this , we need a liveness check which will do a periodic health check after Pod start running or readiness probe completes.

Lets rewrite the Pod specification of Coffee App and add a liveness Probe.

$ vi pod-liveiness.yaml

apiVersion: v1
kind: Pod
metadata:
  name: coffee-app
spec:
  containers:
  - image: ansilh/demo-coffee
    name: coffee
    readinessProbe:
     initialDelaySeconds: 10
     httpGet:
      port: 9090
    livenessProbe:
     periodSeconds: 5
     httpGet:
      port: 9090

Create Pod

$ kubectl create -f pod-liveness.yaml