容器系列-09liveness存活性探测实验步骤

容器系列-09liveness存活性探测实验步骤

# vi liveness-exec.yaml
# kubectl apply -f liveness-exec.yaml
# kubectl get pods
#  kubectl describe pods liveness-exec
# kubectl get pods
#  kubectl exec -it liveness-exec -- /bin/sh
# kubectl get pods
# kubectl get pods
# kubectl logs liveness-exec



---演示
[root@xianchaomaster1 liveness]# vi liveness-exec.yaml
apiVersion: v1
kind: Pod
metadata:
  name: liveness-exec
  labels:
    app: liveness
spec:
  containers:
  - name: liveness
    image: busybox
    args: #创建测试探针探测的文件
    - /bin/sh
    - -c
    - touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600
    livenessProbe:
      initialDelaySeconds: 10 #延迟检测时间
      periodSeconds: 5 #检测时间间隔
      exec:
        command:
        - cat
        - /tmp/healthy
~
[root@xianchaomaster1 liveness]# kubectl apply -f liveness-exec.yaml
pod/liveness-exec created
[root@xianchaomaster1 liveness]# kubectl get pods
NAME                          READY   STATUS              RESTARTS   AGE
liveness-exec                 0/1     ContainerCreating   0          6s
myapp-pod                     1/1     Running             1          89m
nginx-7f466444dc-dnbz6        1/1     Running             3          3d7h
nginx-7f466444dc-mxgc8        1/1     Running             3          3d7h
nginx-test-75c685fdb7-dphvw   1/1     Running             1          28h
nginx-test-75c685fdb7-rvg8z   1/1     Running             1          28h
[root@xianchaomaster1 liveness]#  kubectl describe pods liveness-exec
Name:         liveness-exec
Namespace:    default
Priority:     0
Node:         xianchaonode1/192.168.126.181
Start Time:   Mon, 03 Oct 2022 16:47:26 +0800
Labels:       app=liveness
Annotations:  cni.projectcalico.org/podIP: 10.244.121.43/32
              cni.projectcalico.org/podIPs: 10.244.121.43/32
Status:       Running
IP:           10.244.121.43
IPs:
  IP:  10.244.121.43
Containers:
  liveness:
    Container ID:  docker://838c306cb50a720b7667f27b92a3e9fb5cdcef7c61fbcd64b712a872c4e2b8bc
    Image:         busybox
    Image ID:      docker-pullable://busybox@sha256:5acba83a746c7608ed544dc1533b87c737a0b0fb730301639a0179f9344b1678
    Port:          <none>
    Host Port:     <none>
    Args:
      /bin/sh
      -c
      touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600
    State:          Running
      Started:      Mon, 03 Oct 2022 16:47:43 +0800
    Ready:          True
    Restart Count:  0
    Liveness:       exec [cat /tmp/healthy] delay=10s timeout=1s period=5s #success=1 #failure=3
    Environment:    <none>
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-w7znj (ro)
Conditions:
  Type              Status
  Initialized       True
  Ready             True
  ContainersReady   True
  PodScheduled      True
Volumes:
  default-token-w7znj:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  default-token-w7znj
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                 node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
  Type     Reason     Age              From               Message
  ----     ------     ----             ----               -------
  Normal   Scheduled  56s              default-scheduler  Successfully assigned default/liveness-exec to xianchaonode1
  Normal   Pulling    55s              kubelet            Pulling image "busybox"
  Normal   Pulled     39s              kubelet            Successfully pulled image "busybox" in 15.865741256s
  Normal   Created    39s              kubelet            Created container liveness
  Normal   Started    39s              kubelet            Started container liveness
  Warning  Unhealthy  1s (x2 over 6s)  kubelet            Liveness probe failed: cat: can't open '/tmp/healthy': No such file or directory
You have new mail in /var/spool/mail/root
[root@xianchaomaster1 liveness]# kubectl get pods
NAME                          READY   STATUS    RESTARTS   AGE
liveness-exec                 1/1     Running   0          93s
myapp-pod                     1/1     Running   1          91m
nginx-7f466444dc-dnbz6        1/1     Running   3          3d7h
nginx-7f466444dc-mxgc8        1/1     Running   3          3d7h
nginx-test-75c685fdb7-dphvw   1/1     Running   1          28h
nginx-test-75c685fdb7-rvg8z   1/1     Running   1          28h

[root@xianchaomaster1 liveness]# kubectl get pods
NAME                          READY   STATUS    RESTARTS   AGE
liveness-exec                 1/1     Running   1          2m14s
myapp-pod                     1/1     Running   1          91m
nginx-7f466444dc-dnbz6        1/1     Running   3          3d7h
nginx-7f466444dc-mxgc8        1/1     Running   3          3d7h
nginx-test-75c685fdb7-dphvw   1/1     Running   1          28h
nginx-test-75c685fdb7-rvg8z   1/1     Running   1          28h
You have new mail in /var/spool/mail/root
[root@xianchaomaster1 liveness]#  kubectl exec -it liveness-exec -- /bin/sh
/ # exit
You have new mail in /var/spool/mail/root
[root@xianchaomaster1 liveness]# kubectl get pods
NAME                          READY   STATUS    RESTARTS   AGE
liveness-exec                 1/1     Running   2          4m5s
myapp-pod                     1/1     Running   1          93m
nginx-7f466444dc-dnbz6        1/1     Running   3          3d7h
nginx-7f466444dc-mxgc8        1/1     Running   3          3d7h
nginx-test-75c685fdb7-dphvw   1/1     Running   1          29h
nginx-test-75c685fdb7-rvg8z   1/1     Running   1          29h
[root@xianchaomaster1 liveness]# kubectl get pods
NAME                          READY   STATUS    RESTARTS   AGE
liveness-exec                 1/1     Running   3          4m55s
myapp-pod                     1/1     Running   1          94m
nginx-7f466444dc-dnbz6        1/1     Running   3          3d7h
nginx-7f466444dc-mxgc8        1/1     Running   3          3d7h
nginx-test-75c685fdb7-dphvw   1/1     Running   1          29h
nginx-test-75c685fdb7-rvg8z   1/1     Running   1          29h
[root@xianchaomaster1 liveness]# kubectl logs liveness-exec
You have new mail in /var/spool/mail/root
[root@xianchaomaster1 liveness]#