title: How to define a liveness command
body: <p>A livenessProbe (extracted from <a href="https://raw.githubusercontent.com/kubernetes/kubernetes.github.io/master/docs/tasks/configure-pod-container/exec-liveness.yaml" rel="noreferrer">an example</a>) below is working well.</p>
  
  <pre><code>livenessProbe:
    exec:
      command:
      - cat
      - /tmp/healthy
  </code></pre>
  
  <p>But, my livenessProbe is not working.(pod is continually restarted).
  YAML is below</p>
  
  <pre><code>apiVersion: v1
  kind: Pod
  metadata:
    labels:
      test: liveness-test
    name: liveness
  spec:
    containers:
    - name: liveness
      args:
      - /bin/bash
      - -c
      - /home/my_home/run_myprogram.sh; sleep 20
      image: liveness:v0.6
      securityContext:
        privileged: true
      livenessProbe:
        exec:
          command:
          - /home/my_home/check.sh
        initialDelaySeconds: 10
        periodSeconds: 5
  </code></pre>
  
  <p>/home/my_home/check.sh (to restart the pod when the number of running processes is 1 or 0) is below, which is pre-tested.</p>
  
  <pre><code>#!/bin/sh
  if [ $(ps -ef | grep -v grep | grep my-program | wc -l) -lt 2 ]; then
    exit 1
  else
    exit 0
  fi
  </code></pre>