Kubernetes - liveness and Readiness

  You want to make sure that if the applications running inside some of your pods get into a broken state, Kubernetes restarts the pods automatically.

#Example of linveness

apiVersion: apps/v1

kind: Deployment

metadata:

  creationTimestamp: null

  labels:

    app: podliveness

  name: podliveness

spec:

  replicas: 1

  selector:

    matchLabels:

      app: podliveness

  strategy: {}

  template:

    metadata:

      labels:

        app: podliveness

    spec:

      containers:

      - image: busybox

        name: busybox

        args:

         - /bin/sh

         - -c

         - touch webapp; sleep 20; rm -f webapp; sleep 600

        livenessProbe:

         exec:

          command:

            - cat

            - webapp

         initialDelaySeconds: 5

         periodSeconds: 3

#Example of Readiness

apiVersion: apps/v1

kind: Deployment

metadata:

  creationTimestamp: null

  labels:

    app: podrediness

  name: podrediness

spec:

  replicas: 1

  selector:

    matchLabels:

      app: podrediness

  strategy: {}

  template:

    metadata:

      labels:

        app: podrediness

    spec:

      containers:

      - image: busybox

        name: busybox

        args:

         - /bin/sh

         - -c

         - sleep 20; touch webapp; sleep 600

        readinessProbe:

         exec:

          command:

            - cat

            - webapp

         initialDelaySeconds: 15

         periodSeconds: 3