摘要:記錄一個簡單的的使用創建探針具體的文件如下創建該查看當前的狀態測試將容器內的刪除掉登陸容器使用命令登陸容器可以看到,當我們把移走后,這個容器立馬就退出了。
記錄一個簡單的livenessProb的使用
創建livenessProbe探針具體的liveness-httpget.yaml文件如下:
apiVersion: v1 kind: Pod metadata: name: liveness-httpget-pod namespace: default spec: containers: - name: liveness-exec-container image: ikubernetes/myapp:v1 imagePullPolicy: IfNotPresent ports: - name: http containerPort: 80 livenessProbe: httpGet: port: http path: /index.html initialDelaySeconds: 1 periodSeconds: 3 [root@master manifests]# cat liveness-httpget.yaml apiVersion: v1 kind: Pod metadata: name: liveness-httpget-pod namespace: default spec: containers: - name: liveness-exec-container image: ikubernetes/myapp:v1 imagePullPolicy: IfNotPresent ports: - name: http containerPort: 80 livenessProbe: httpGet: port: http path: /index.html initialDelaySeconds: 1 periodSeconds: 3
創建該pod
[root@master manifests]# kubectl create -f liveness-httpget.yaml pod/liveness-httpget-pod created
查看當前pod的狀態
[root@master manifests]# kubectl describe pod liveness-httpget-pod Name: liveness-httpget-pod Namespace: default Priority: 0 PriorityClassName:測試將容器內的index.html刪除掉 登陸容器Node: node02/192.168.18.130 Start Time: Fri, 17 Aug 2018 18:24:26 +0800 Labels: Annotations: Status: Running IP: 10.244.2.40 Containers: liveness-exec-container: Container ID: docker://b00bc09eac7c4dcadb482dd9795a9f7e6d9b68ca63e75384da18feb0ef7bdc6d Image: ikubernetes/myapp:v1 Image ID: docker-pullable://ikubernetes/myapp@sha256:9c3dc30b5219788b2b8a4b065f548b922a34479577befb54b03330999d30d513 Port: 80/TCP Host Port: 0/TCP State: Running Started: Fri, 17 Aug 2018 18:24:27 +0800 Ready: True Restart Count: 0 Liveness: http-get http://:http/index.html delay=1s timeout=1s period=3s #success=1 #failure=3 Environment: Mounts: /var/run/secrets/kubernetes.io/serviceaccount from default-token-qcfxf (ro) Conditions: Type Status Initialized True Ready True ContainersReady True PodScheduled True Volumes: default-token-qcfxf: Type: Secret (a volume populated by a Secret) SecretName: default-token-qcfxf Optional: false QoS Class: BestEffort Node-Selectors: Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s node.kubernetes.io/unreachable:NoExecute for 300s Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal Pulled 37s kubelet, node02 Container image "ikubernetes/myapp:v1" already present on machine Normal Created 37s kubelet, node02 Created container Normal Started 37s kubelet, node02 Started container Normal Scheduled 32s default-scheduler Successfully assigned default/liveness-httpget-pod to node02
使用命令 kubectl exec liveness-httpget-pod -c liveness-exec-container -it -- /bin/sh 登陸容器
[root@master manifests]# kubectl exec liveness-httpget-pod -c liveness-exec-container -it -- /bin/sh / # ls bin dev etc home lib media mnt proc root run sbin srv sys tmp usr var / # mv /usr/share/nginx/html/index.html index.html / # command terminated with exit code 137
可以看到,當我們把index.html移走后,這個容器立馬就退出了。
此時,查看pod的信息
[root@master manifests]# kubectl describe pod liveness-httpget-pod Name: liveness-httpget-pod Namespace: default Priority: 0 PriorityClassName:Node: node02/192.168.18.130 Start Time: Fri, 17 Aug 2018 18:24:26 +0800 Labels: Annotations: Status: Running IP: 10.244.2.40 Containers: liveness-exec-container: Container ID: docker://ac663b9e29c2cbc9c1d0283f1609914be69964149247945266ddcc8b33dde12f Image: ikubernetes/myapp:v1 Image ID: docker-pullable://ikubernetes/myapp@sha256:9c3dc30b5219788b2b8a4b065f548b922a34479577befb54b03330999d30d513 Port: 80/TCP Host Port: 0/TCP State: Running Started: Fri, 17 Aug 2018 18:48:07 +0800 Last State: Terminated Reason: Completed Exit Code: 0 Started: Fri, 17 Aug 2018 18:24:27 +0800 Finished: Fri, 17 Aug 2018 18:48:06 +0800 Ready: True Restart Count: 1 Liveness: http-get http://:http/index.html delay=1s timeout=1s period=3s #success=1 #failure=3 Environment: Mounts: /var/run/secrets/kubernetes.io/serviceaccount from default-token-qcfxf (ro) Conditions: Type Status Initialized True Ready True ContainersReady True PodScheduled True Volumes: default-token-qcfxf: Type: Secret (a volume populated by a Secret) SecretName: default-token-qcfxf Optional: false QoS Class: BestEffort Node-Selectors: Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s node.kubernetes.io/unreachable:NoExecute for 300s Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal Scheduled 24m default-scheduler Successfully assigned default/liveness-httpget-pod to node02 Warning Unhealthy 1m (x3 over 1m) kubelet, node02 Liveness probe failed: HTTP probe failed with statuscode: 404 Normal Pulled 1m (x2 over 24m) kubelet, node02 Container image "ikubernetes/myapp:v1" already present on machine Normal Created 1m (x2 over 24m) kubelet, node02 Created container Normal Started 1m (x2 over 24m) kubelet, node02 Started container Normal Killing 1m kubelet, node02 Killing container with id docker://liveness-exec-container:Container failed liveness probe.. Container will be killed and recreated.
看輸出,容器由于健康檢查未通過,pod會被殺掉,并重新創建
[root@master manifests]# kubectl get pods NAME READY STATUS RESTARTS AGE liveness-httpget-pod 1/1 Running 1 33m
restarts 為 1
重新登陸容器查看重新登陸容器,發現index.html又出現了,證明容器是被重拉了。
[root@master manifests]# kubectl exec liveness-httpget-pod -c liveness-exec-container -it -- /bin/sh / # cat /usr/share/nginx/html/index.html Hello MyApp | Version: v1 | Pod Name
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