#LifeCycle Demo
apiVersion: v1
kind: Pod
metadata:
  name: defer-demo
  annotations:
    pod.beta.kubernetes.io/init-containers: '[
       {
         "name": "first",
         "image": "bash",
         "command": ["/usr/local/bin/bash", "-c", "echo started"],
         "volumeMounts": [
            {
               "name": "config",
               "mountPath": "/config"
            }
         ]
       }
    ]'
    pod.alpha.kubernetes.io/defer-containers: '[
       {
         "name": "last-but-one",
         "image": "bash",
         "command": ["/usr/local/bin/bash", "-c", "echo entered deferContainers"],
         "volumeMounts": [
            {
               "name": "config",
               "mountPath": "/config"
            }
         ]
       },
       {
         "name": "last",
         "image": "busybox",
         "command": ["/bin/echo", "finished"],
         "volumeMounts": [
            {
               "name": "config",
               "mountPath": "/config"
            }
         ]
       }
    ]'
spec:
  terminationGracePeriodSeconds: 60
  containers:
  - name: prestop
    image: bash
    command: [ "/usr/local/bin/bash", "-c", "--" ]
    args: [ "while true; do sleep 1; echo Prestop1:`date`;  cat /config/test.file; done;" ]
    volumeMounts:
      - name: config
        mountPath: /config
    lifecycle:
      preStop:
        exec:
          command: ["/usr/local/bin/bash","-c", "echo preExitHook_executing > /config/test.file; sleep 2; echo preExithook_finished > /config/test.file"]
  volumes:
      - name: config
        emptyDir: {}

  FirstSeen     LastSeen        Count   From                    SubObjectPath                           Type            Reason                  Message
  ---------     --------        -----   ----                    -------------                           --------        ------                  -------
  2m            2m              1       kubelet, kube-node-3                                            Normal          SuccessfulMountVolume   MountVolume.SetUp succeeded for volume "config"
  2m            2m              1       kubelet, kube-node-3                                            Normal          SuccessfulMountVolume   MountVolume.SetUp succeeded for volume "default-token-7xgh1"
  2m            2m              1       default-scheduler                                               Normal          Scheduled               Successfully assigned defer-demo to kube-node-3
  2m            2m              1       kubelet, kube-node-3    spec.initContainers{first}              Normal          Started                 Started container with id a8ed41f882604468d6564fb3fd0696369344d188b1ef510f31ea65988217245d
  2m            2m              1       kubelet, kube-node-3    spec.initContainers{first}              Normal          Created                 Created container with id a8ed41f882604468d6564fb3fd0696369344d188b1ef510f31ea65988217245d
  2m            2m              1       kubelet, kube-node-3    spec.containers{prestop}                Normal          Created                 Created container with id 4a5cd7168ccc1d5d51c2c60c77e34f6a2348bac12797513a3dc11a411be87eb2
  2m            2m              1       kubelet, kube-node-3    spec.containers{prestop}                Normal          Started                 Started container with id 4a5cd7168ccc1d5d51c2c60c77e34f6a2348bac12797513a3dc11a411be87eb2
  53s           53s             1       kubelet, kube-node-3    spec.deferContainers{last}              Normal          Pulling                 Defer-Container image is being pre-pulled
  2m            16s             3       kubelet, kube-node-3    spec.initContainers{first}              Normal          Pulling                 pulling image "bash"
  2m            10s             3       kubelet, kube-node-3    spec.initContainers{first}              Normal          Pulled                  Successfully pulled image "bash"
  53s           10s             2       kubelet, kube-node-3    spec.deferContainers{last}              Normal          Pulling                 pulling image "busybox"
  10s           10s             1       kubelet, kube-node-3    spec.deferContainers{last-but-one}      Normal          Created                 Created container with id 9ed5e37058012476bb42769e488dbd39dc07d47cb5b90c0d108898558909cf0a
  10s           10s             1       kubelet, kube-node-3    spec.deferContainers{last-but-one}      Normal          Started                 Started container with id 9ed5e37058012476bb42769e488dbd39dc07d47cb5b90c0d108898558909cf0a
  45s           5s              2       kubelet, kube-node-3    spec.deferContainers{last}              Normal          Pulled                  Successfully pulled image "busybox"
  5s            5s              1       kubelet, kube-node-3    spec.deferContainers{last}              Normal          Created                 Created container with id e334389c25b40e69e0b2f6e8c7b6897fddd237a1586ead3b8bc3b81fa50b942e
  5s            5s              1       kubelet, kube-node-3    spec.deferContainers{last}              Normal          Started                 Started container with id e334389c25b40e69e0b2f6e8c7b6897fddd237a1586ead3b8bc3b81fa50b942e
  3s            3s              1       kubelet, kube-node-3    spec.containers{prestop}                Normal          Killing                 Killing container with id docker://4a5cd7168ccc1d5d51c2c60c77e34f6a2348bac12797513a3dc11a411be87eb2:Need to kill Pod