A deployment example which shows deployments do not restart pods in Crashloopbackoff state

demo-deployment.yaml

# USAGE: kubectl apply -f demo-deployment.yaml
# Wait 1 minute
# Observe all pods are in CrashLoopBackOff state
# Observe deployment controller does not restart pods
apiVersion: apps/v1
kind: Deployment
metadata:
  name: crashloopbackoff-demo
  labels:
    status: crashloopbackoff 
spec:
  replicas: 3
  selector:
    matchLabels:
      status: crashloopbackoff
  template:
    metadata:
      labels:
        status: crashloopbackoff
    spec:
      initContainers:
      # computes the current time and store into the shared volume
      - name: init-container
        image: busybox:1.28
        command: ['sh', '-c', 'date +%s > /tmp/shared/start-time']
        volumeMounts:
        - name: time-storage
          mountPath: /tmp/shared
        # loads start time from file created by init container
        # removes the file so restarted containers will fail immediately
        # waits 1 minute and crash
        # shortly -> enters CrashLoopBackOff after 1 minute.
      containers:
      - name: main-container
        image: busybox:1.28
        command: ['sh', '-c', 'start=$(cat /tmp/shared/start-time) && rm /tmp/shared/start-time && while true; do current=$(date +%s); let diff="$current - $start"; echo $diff; [[ "$diff" -gt 60 ]] && exit 1; sleep 2; done']
        volumeMounts:
        - name: time-storage
          mountPath: /tmp/shared
      volumes:
      - name: time-storage
        emptyDir: {}