{"id":1882,"date":"2020-07-04T00:06:39","date_gmt":"2020-07-03T16:06:39","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1882"},"modified":"2020-07-04T00:06:39","modified_gmt":"2020-07-03T16:06:39","slug":"kubernetes-init-%e5%ae%b9%e5%99%a8","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1882","title":{"rendered":"Kubernetes Init \u5bb9\u5668\u00a0 \u00a0"},"content":{"rendered":"

\u00a0 \u00a0Init \u5bb9\u5668\u00a0 \u00a0<\/strong><\/h1>\n

Init \u5bb9\u5668\u662f\u4e00\u79cd\u4e13\u7528\u7684\u5bb9\u5668\uff0c\u5728Pod\u5185\u7684\u5e94\u7528\u5bb9\u5668\u542f\u52a8\u4e4b\u524d\u8fd0\u884c\uff0c\u5e76\u5305\u62ec\u4e00\u4e9b\u5e94\u7528\u955c\u50cf\u4e2d\u4e0d\u5b58\u5728\u7684\u5b9e\u7528\u5de5\u5177\u548c\u5b89\u88c5\u811a\u672c\u3002\u53ef\u4ee5\u5728Pod\u7684\u89c4\u683c\u4fe1\u606f\u4e2d\u4e0econtainers\u6570\u7ec4\u540c\u7ea7\u7684\u4f4d\u7f6e\u6307\u5b9a Init \u5bb9\u5668\u3002<\/p>\n

\u00a0 \u00a0\u7406\u89e3 Init \u5bb9\u5668\u00a0 \u00a0<\/strong><\/h2>\n

<\/h2>\n

Pod\u00a0\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u5bb9\u5668\uff0c\u5e94\u7528\u8fd0\u884c\u5728\u8fd9\u4e9b\u5bb9\u5668\u91cc\u9762\uff0c\u540c\u65f6 Pod \u4e5f\u53ef\u4ee5\u6709\u4e00\u4e2a\u6216\u591a\u4e2a\u5148\u4e8e\u5e94\u7528\u5bb9\u5668\u542f\u52a8\u7684 Init \u5bb9\u5668\u3002
\nInit \u5bb9\u5668\u4e0e\u666e\u901a\u7684\u5bb9\u5668\u6709\u4ee5\u4e0b\u4e0d\u540c\uff1a<\/p>\n

    \n
  • \u5b83\u4eec\u603b\u662f\u8fd0\u884c\u5230\u5b8c\u6210\u3002<\/li>\n
  • \u6bcf\u4e2a\u90fd\u5fc5\u987b\u5728\u4e0b\u4e00\u4e2a\u542f\u52a8\u4e4b\u524d\u6210\u529f\u5b8c\u6210\u3002<\/li>\n<\/ul>\n

    \u5982\u679c Pod \u7684 Init \u5bb9\u5668\u5931\u8d25\uff0cKubernetes \u4f1a\u4e0d\u65ad\u5730\u91cd\u542f\u8be5 Pod\uff0c\u76f4\u5230 Init \u5bb9\u5668\u6210\u529f\u4e3a\u6b62\u3002\u7136\u800c\uff0c\u5982\u679c Pod \u5bf9\u5e94\u7684 restartPolicy \u503c\u4e3a Never\uff0c\u5b83\u4e0d\u4f1a\u91cd\u65b0\u542f\u52a8\u3002
    \n\u6307\u5b9a\u5bb9\u5668\u4e3a Init \u5bb9\u5668\uff0c\u9700\u8981\u5728 Pod \u7684 spec \u4e2d\u6dfb\u52a0 initContainers \u5b57\u6bb5\uff0c \u8be5\u5b57\u6bb5\u5167\u4ee5Container \u7c7b\u578b\u5bf9\u8c61\u6570\u7ec4\u7684\u5f62\u5f0f\u7ec4\u7ec7\uff0c\u548c\u5e94\u7528\u7684 containers \u6570\u7ec4\u540c\u7ea7\u76f8\u90bb\u3002Init \u5bb9\u5668\u7684\u72b6\u6001\u5728 status.initContainerStatuses \u5b57\u6bb5\u4e2d\u4ee5\u5bb9\u5668\u72b6\u6001\u6570\u7ec4\u7684\u683c\u5f0f\u8fd4\u56de\uff08\u7c7b\u4f3c status.containerStatuses \u5b57\u6bb5\uff09\u3002<\/p>\n

    \u4e0e\u666e\u901a\u5bb9\u5668\u7684\u4e0d\u540c\u4e4b\u5904<\/strong><\/h3>\n

    Init \u5bb9\u5668\u652f\u6301\u5e94\u7528\u5bb9\u5668\u7684\u5168\u90e8\u5b57\u6bb5\u548c\u7279\u6027\uff0c\u5305\u62ec\u8d44\u6e90\u9650\u5236\u3001\u6570\u636e\u5377\u548c\u5b89\u5168\u8bbe\u7f6e\u3002\u7136\u800c\uff0cInit \u5bb9\u5668\u5bf9\u8d44\u6e90\u8bf7\u6c42\u548c\u9650\u5236\u7684\u5904\u7406\u7a0d\u6709\u4e0d\u540c\uff0c\u5728\u4e0b\u9762\u00a0\u8d44\u6e90\u00a0\u5904\u6709\u8bf4\u660e\u3002
    \n\u540c\u65f6 Init \u5bb9\u5668\u4e0d\u652f\u6301 Readiness Probe\uff0c\u56e0\u4e3a\u5b83\u4eec\u5fc5\u987b\u5728 Pod \u5c31\u7eea\u4e4b\u524d\u8fd0\u884c\u5b8c\u6210\u3002
    \n\u5982\u679c\u4e3a\u4e00\u4e2a Pod \u6307\u5b9a\u4e86\u591a\u4e2a Init \u5bb9\u5668\uff0c\u8fd9\u4e9b\u5bb9\u5668\u4f1a\u6309\u987a\u5e8f\u9010\u4e2a\u8fd0\u884c\u3002\u6bcf\u4e2a Init \u5bb9\u5668\u5fc5\u987b\u8fd0\u884c\u6210\u529f\uff0c\u4e0b\u4e00\u4e2a\u624d\u80fd\u591f\u8fd0\u884c\u3002\u5f53\u6240\u6709\u7684 Init \u5bb9\u5668\u8fd0\u884c\u5b8c\u6210\u65f6\uff0cKubernetes \u624d\u4f1a\u4e3a Pod \u521d\u59cb\u5316\u5e94\u7528\u5bb9\u5668\u5e76\u50cf\u5e73\u5e38\u4e00\u6837\u8fd0\u884c\u3002<\/p>\n

    \u00a0 \u00a0Init \u5bb9\u5668\u80fd\u505a\u4ec0\u4e48\u00a0 \u00a0<\/strong><\/h2>\n

    Init \u5bb9\u5668\u5177\u6709\u4e0e\u5e94\u7528\u5bb9\u5668\u5206\u79bb\u7684\u5355\u72ec\u955c\u50cf\uff0c\u5176\u542f\u52a8\u76f8\u5173\u4ee3\u7801\u5177\u6709\u5982\u4e0b\u4f18\u52bf\uff1a<\/p>\n

      \n
    • Init \u5bb9\u5668\u53ef\u4ee5\u5305\u542b\u4e00\u4e9b\u5b89\u88c5\u8fc7\u7a0b\u4e2d\u5e94\u7528\u5bb9\u5668\u4e2d\u4e0d\u5b58\u5728\u7684\u5b9e\u7528\u5de5\u5177\u6216\u4e2a\u6027\u5316\u4ee3\u7801\u3002\u4f8b\u5982\uff0c\u6ca1\u6709\u5fc5\u8981\u4ec5\u4e3a\u4e86\u5728\u5b89\u88c5\u8fc7\u7a0b\u4e2d\u4f7f\u7528\u7c7b\u4f3c sed\u3001 awk\u3001 python \u6216 dig \u8fd9\u6837\u7684\u5de5\u5177\u800c\u53bbFROM \u4e00\u4e2a\u955c\u50cf\u6765\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u955c\u50cf\u3002<\/li>\n
    • Init \u5bb9\u5668\u53ef\u4ee5\u5b89\u5168\u5730\u8fd0\u884c\u8fd9\u4e9b\u5de5\u5177\uff0c\u907f\u514d\u8fd9\u4e9b\u5de5\u5177\u5bfc\u81f4\u5e94\u7528\u955c\u50cf\u7684\u5b89\u5168\u6027\u964d\u4f4e\u3002<\/li>\n
    • \u5e94\u7528\u955c\u50cf\u7684\u521b\u5efa\u8005\u548c\u90e8\u7f72\u8005\u53ef\u4ee5\u5404\u81ea\u72ec\u7acb\u5de5\u4f5c\uff0c\u800c\u6ca1\u6709\u5fc5\u8981\u8054\u5408\u6784\u5efa\u4e00\u4e2a\u5355\u72ec\u7684\u5e94\u7528\u955c\u50cf\u3002<\/li>\n
    • Init \u5bb9\u5668\u80fd\u4ee5\u4e0d\u540c\u4e8ePod\u5185\u5e94\u7528\u5bb9\u5668\u7684\u6587\u4ef6\u7cfb\u7edf\u89c6\u56fe\u8fd0\u884c\u3002\u56e0\u6b64\uff0cInit\u5bb9\u5668\u53ef\u5177\u6709\u8bbf\u95ee\u00a0Secrets\u00a0\u7684\u6743\u9650\uff0c\u800c\u5e94\u7528\u5bb9\u5668\u4e0d\u80fd\u591f\u8bbf\u95ee\u3002<\/li>\n
    • \u7531\u4e8e Init \u5bb9\u5668\u5fc5\u987b\u5728\u5e94\u7528\u5bb9\u5668\u542f\u52a8\u4e4b\u524d\u8fd0\u884c\u5b8c\u6210\uff0c\u56e0\u6b64 Init \u5bb9\u5668\u63d0\u4f9b\u4e86\u4e00\u79cd\u673a\u5236\u6765\u963b\u585e\u6216\u5ef6\u8fdf\u5e94\u7528\u5bb9\u5668\u7684\u542f\u52a8\uff0c\u76f4\u5230\u6ee1\u8db3\u4e86\u4e00\u7ec4\u5148\u51b3\u6761\u4ef6\u3002\u4e00\u65e6\u524d\u7f6e\u6761\u4ef6\u6ee1\u8db3\uff0cPod\u5185\u7684\u6240\u6709\u7684\u5e94\u7528\u5bb9\u5668\u4f1a\u5e76\u884c\u542f\u52a8\u3002<\/li>\n<\/ul>\n

      <\/h3>\n

      \u5982\u4f55\u4f7f\u7528 Init \u5bb9\u5668<\/strong><\/h3>\n
        \n
      • \u7b49\u5f85\u4e00\u4e2a Service \u5b8c\u6210\u521b\u5efa\uff0c\u901a\u8fc7\u7c7b\u4f3c\u5982\u4e0b shell \u547d\u4ee4\uff1a<\/li>\n<\/ul>\n
        \u00a0for\u00a0i\u00a0in\u00a0{1..100};\u00a0do\u00a0sleep\u00a01;\u00a0if\u00a0dig\u00a0myservice;\u00a0then\u00a0exit\u00a00;\u00a0fi;\u00a0exit\u00a01<\/pre>\n
          \n
        • \u6ce8\u518c\u8fd9\u4e2a Pod \u5230\u8fdc\u7a0b\u670d\u52a1\u5668\uff0c\u901a\u8fc7\u5728\u547d\u4ee4\u4e2d\u8c03\u7528 API\uff0c\u7c7b\u4f3c\u5982\u4e0b\uff1a<\/li>\n<\/ul>\n
          curl -X POST http:\/\/$MANAGEMENT_SERVICE_HOST:$MANAGEMENT_SERVICE_PORT\/register -d \\'instance=$(<POD_NAME>)&ip=$(<POD_IP>)\\'<\/pre>\n
            \n
          • \u5728\u542f\u52a8\u5e94\u7528\u5bb9\u5668\u4e4b\u524d\u7b49\u4e00\u6bb5\u65f6\u95f4\uff0c\u4f7f\u7528 sleep 60 \u3002<\/li>\n
          • \u514b\u9686 Git \u4ed3\u5e93\u5230 Volume\u3002<\/li>\n
          • \u5c06\u914d\u7f6e\u503c\u653e\u5230\u914d\u7f6e\u6587\u4ef6\u4e2d\uff0c\u8fd0\u884c\u6a21\u677f\u5de5\u5177\u4e3a\u4e3b\u5e94\u7528\u5bb9\u5668\u52a8\u6001\u5730\u751f\u6210\u914d\u7f6e\u6587\u4ef6\u3002\u4f8b\u5982\uff0c\u5728\u914d\u7f6e\u6587\u4ef6\u4e2d\u5b58\u653e POD_IP \u503c\uff0c\u5e76\u4f7f\u7528 Jinja \u751f\u6210\u4e3b\u5e94\u7528\u914d\u7f6e\u6587\u4ef6\u3002<\/li>\n<\/ul>\n
            \u4f7f\u7528 Init \u5bb9\u5668<\/strong><\/h3>\n
            \u4e0b\u9762\u7684\u4f8b\u5b50\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5177\u6709 2 \u4e2a Init \u5bb9\u5668\u7684\u7b80\u5355 Pod\u3002\u7b2c\u4e00\u4e2a\u7b49\u5f85 myservice \u542f\u52a8\uff0c\u7b2c\u4e8c\u4e2a\u7b49\u5f85 mydb \u542f\u52a8\u3002\u4e00\u65e6\u8fd9\u4e24\u4e2a Init\u5bb9\u5668 \u90fd\u542f\u52a8\u5b8c\u6210\uff0cPod \u5c06\u542f\u52a8spec\u533a\u57df\u4e2d\u7684\u5e94\u7528\u5bb9\u5668\u3002
            \napiVersion: v1 kind: Pod metadata: name: myapp-pod labels: app: myapp spec: containers: – name: myapp-container image: busybox:1.28 command: [\\’sh\\’, \\’-c\\’, \\’echo The app is running! && sleep 3600\\’] initContainers: – name: init-myservice image: busybox:1.28 command: [\\’sh\\’, \\’-c\\’, \\”until nslookup myservice.$(cat \/var\/run\/secrets\/kubernetes.io\/serviceaccount\/namespace).svc.cluster.local; do echo waiting for myservice; sleep 2; done\\”] – name: init-mydb image: busybox:1.28 command: [\\’sh\\’, \\’-c\\’, \\”until nslookup mydb.$(cat \/var\/run\/secrets\/kubernetes.io\/serviceaccount\/namespace).svc.cluster.local; do echo waiting for mydb; sleep 2; done\\”]
            \n\u4ee5\u4e0b yaml \u6587\u4ef6\u5c55\u793a\u4e86 mydb \u548c myservice \u4e24\u4e2a Service\uff1a<\/p>\n
            kind: Service\napiVersion: v1\nmetadata:\n  name: myservice\nspec:\n  ports:\n    - protocol: TCP\n      port: 80\n      targetPort: 9376\n---\nkind: Service\napiVersion: v1\nmetadata:\n  name: mydb\nspec:\n  ports:\n    - protocol: TCP\n      port: 80\n      targetPort: 9377<\/pre>\n
            <\/code>\u8981\u542f\u52a8\u8fd9\u4e2a Pod\uff0c\u53ef\u4ee5\u6267\u884c\u5982\u4e0b\u547d\u4ee4\uff1a<\/p>\n
            kubectl apply -f myapp.yaml\npod\/myapp-pod created<\/pre>\n
            \u8981\u68c0\u67e5\u5176\u72b6\u6001\uff1a<\/p>\n
            kubectl get -f myapp.yaml\nNAME        READY     STATUS     RESTARTS   AGE\nmyapp-pod   0\/1       Init:0\/2   0          6m<\/pre>\n
            <\/code><\/pre>\n
            \u5982\u9700\u66f4\u8be6\u7ec6\u7684\u4fe1\u606f\uff1a<\/p>\n
            kubectl describe -f myapp.yaml\n<\/pre>\n
            Name:          myapp-pod\nNamespace:     default\n[...]\nLabels:        app=myapp\nStatus:        Pending\n[...]\nInit Containers:\n  init-myservice:\n[...]\n    State:         Running\n[...]\n  init-mydb:\n[...]\n    State:         Waiting\n      Reason:      PodInitializing\n    Ready:         False\n[...]\nContainers:\n  myapp-container:\n[...]\n    State:         Waiting\n      Reason:      PodInitializing\n    Ready:         False\n[...]\nEvents:\n  FirstSeen    LastSeen    Count    From                      SubObjectPath                           Type          Reason        Message\n  ---------    --------    -----    ----                      -------------                           --------      ------        -------\n  16s          16s         1        {default-scheduler }                                              Normal        Scheduled     Successfully assigned myapp-pod to 172.17.4.201\n  16s          16s         1        {kubelet 172.17.4.201}    spec.initContainers{init-myservice}     Normal        Pulling       pulling image \\\"busybox\\\"\n  13s          13s         1        {kubelet 172.17.4.201}    spec.initContainers{init-myservice}     Normal        Pulled        Successfully pulled image \\\"busybox\\\"\n  13s          13s         1        {kubelet 172.17.4.201}    spec.initContainers{init-myservice}     Normal        Created       Created container with docker id 5ced34a04634; Security:[seccomp=unconfined]\n  13s          13s         1        {kubelet 172.17.4.201}    spec.initContainers{init-myservice}     Normal        Started       Started container with docker id 5ced34a04634<\/pre>\n
            \u5982\u9700\u67e5\u770bPod\u5185 Init \u5bb9\u5668\u7684\u65e5\u5fd7\uff0c\u8bf7\u6267\u884c:<\/p>\n
            $ kubectl logs myapp-pod -c init-myservice # Inspect the first init container\n$ kubectl logs myapp-pod -c init-mydb      # Inspect the second init container<\/pre>\n
            \u8fd9\u65f6 Init \u5bb9\u5668\u5c06\u4f1a\u7b49\u5f85\u81f3\u53d1\u73b0\u540d\u79f0\u4e3amydb\u548cmyservice\u7684 Service\u3002
            \n\u521b\u5efa Service \u7684\u914d\u7f6e\u6587\u4ef6\uff1a<\/p>\n
            ---\napiVersion: v1\nkind: Service\nmetadata:\n  name: myservice\nspec:\n  ports:\n  - protocol: TCP\n    port: 80\n    targetPort: 9376\n---\napiVersion: v1\nkind: Service\nmetadata:\n  name: mydb\nspec:\n  ports:\n  - protocol: TCP\n    port: 80\n    targetPort: 9377<\/pre>\n
            \u521b\u5efa mydb \u548c myservice \u7684 service \u547d\u4ee4\uff1a<\/p>\n
            $ kubectl create -f services.yaml\nservice \\\"myservice\\\" createdservice \\\"mydb\\\" created<\/pre>\n
            \u5f53 Init\u5bb9\u5668 \u6267\u884c\u5b8c\u6bd5\uff0c\u968f\u540emy-app\u7684Pod\u8f6c\u79fb\u8fdb\u5165 Running \u72b6\u6001\uff1a<\/p>\n
            $ kubectl get -f myapp.yaml\nNAME        READY     STATUS    RESTARTS   AGE\nmyapp-pod   1\/1       Running   0          9m<\/pre>\n
            \u542f\u52a8 mydb \u548c myservice \u8fd9\u4e24\u4e2a Service\uff0c\u80fd\u591f\u770b\u5230 Init \u5bb9\u5668\u5b8c\u6210\uff0c\u5e76\u4e14 myapp-pod \u88ab\u521b\u5efa\uff1a<\/p>\n
            \u00a0 \u00a0\u5177\u4f53\u884c\u4e3a<\/h2>\n
            \u5728 Pod \u542f\u52a8\u8fc7\u7a0b\u4e2d\uff0c\u6bcf\u4e2aInit \u5bb9\u5668\u5728\u7f51\u7edc\u548c\u6570\u636e\u5377\u521d\u59cb\u5316\u4e4b\u540e\u4f1a\u6309\u987a\u5e8f\u542f\u52a8\u3002\u6bcf\u4e2a Init\u5bb9\u5668 \u6210\u529f\u9000\u51fa\u540e\u624d\u4f1a\u542f\u52a8\u4e0b\u4e00\u4e2a Init\u5bb9\u5668\u3002\u5982\u679c\u56e0\u4e3a\u8fd0\u884c\u6216\u9000\u51fa\u65f6\u5931\u8d25\u5f15\u53d1\u5bb9\u5668\u542f\u52a8\u5931\u8d25\uff0c\u5b83\u4f1a\u6839\u636e Pod \u7684 restartPolicy \u7b56\u7565\u8fdb\u884c\u91cd\u8bd5\u3002\u7136\u800c\uff0c\u5982\u679c Pod \u7684 restartPolicy \u8bbe\u7f6e\u4e3a Always\uff0cInit \u5bb9\u5668\u5931\u8d25\u65f6\u4f1a\u4f7f\u7528 restartPolicy \u7684 OnFailure \u7b56\u7565\u3002<\/p>\n
            \u5728\u6240\u6709\u7684 Init \u5bb9\u5668\u6ca1\u6709\u6210\u529f\u4e4b\u524d\uff0cPod \u5c06\u4e0d\u4f1a\u53d8\u6210 Ready \u72b6\u6001\u3002Init \u5bb9\u5668\u7684\u7aef\u53e3\u5c06\u4e0d\u4f1a\u5728 Service \u4e2d\u8fdb\u884c\u805a\u96c6\u3002\u6b63\u5728\u521d\u59cb\u5316\u4e2d\u7684 Pod \u5904\u4e8e Pending \u72b6\u6001\uff0c\u4f46\u4f1a\u5c06\u6761\u4ef6 Initializing \u8bbe\u7f6e\u4e3a true\u3002<\/section>\n
            \u5982\u679c Pod \u91cd\u542f\uff0c\u6240\u6709 Init \u5bb9\u5668\u5fc5\u987b\u91cd\u65b0\u6267\u884c\u3002<\/section>\n
            \u5bf9 Init \u5bb9\u5668 spec \u7684\u4fee\u6539\u4ec5\u9650\u4e8e\u5bb9\u5668\u7684 image \u5b57\u6bb5\u3002\u66f4\u6539 Init \u5bb9\u5668\u7684 image \u5b57\u6bb5\uff0c\u7b49\u540c\u4e8e\u91cd\u542f\u8be5 Pod\u3002<\/section>\n
            \u56e0\u4e3a Init \u5bb9\u5668\u53ef\u80fd\u4f1a\u88ab\u91cd\u542f\u3001\u91cd\u8bd5\u6216\u8005\u91cd\u65b0\u6267\u884c\uff0c\u6240\u4ee5 Init \u5bb9\u5668\u7684\u4ee3\u7801\u5e94\u8be5\u662f\u5e42\u7b49\u7684\u3002\u7279\u522b\u5730\uff0c\u57fa\u4e8e EmptyDirs \u5199\u6587\u4ef6\u7684\u4ee3\u7801\uff0c\u5e94\u8be5\u5bf9\u8f93\u51fa\u6587\u4ef6\u53ef\u80fd\u5df2\u7ecf\u5b58\u5728\u505a\u597d\u51c6\u5907\u3002<\/section>\n
            Init \u5bb9\u5668\u5177\u6709\u5e94\u7528\u5bb9\u5668\u7684\u6240\u6709\u5b57\u6bb5\u3002\u7136\u800c Kubernetes \u7981\u6b62\u4f7f\u7528 readinessProbe\uff0c\u56e0\u4e3a Init \u5bb9\u5668\u4e0d\u80fd\u5b9a\u4e49\u4e0d\u540c\u4e8e\u5b8c\u6210\uff08completion\uff09\u7684\u5c31\u7eea\uff08readiness\uff09\u3002\u8fd9\u4e00\u70b9\u4f1a\u5728\u6821\u9a8c\u65f6\u5f3a\u5236\u6267\u884c\u3002<\/section>\n
            \u5728 Pod \u4e0a\u4f7f\u7528 activeDeadlineSeconds\u548c\u5728\u5bb9\u5668\u4e0a\u4f7f\u7528 livenessProbe \u53ef\u4ee5\u907f\u514d Init \u5bb9\u5668\u4e00\u76f4\u91cd\u590d\u5931\u8d25\u3002activeDeadlineSeconds \u65f6\u95f4\u5305\u542b\u4e86 Init \u5bb9\u5668\u542f\u52a8\u7684\u65f6\u95f4\u3002<\/section>\n
            \u5728 Pod \u4e2d\u7684\u6bcf\u4e2a\u5e94\u7528\u5bb9\u5668\u548c Init \u5bb9\u5668\u7684\u540d\u79f0\u5fc5\u987b\u552f\u4e00\uff1b\u4e0e\u4efb\u4f55\u5176\u5b83\u5bb9\u5668\u5171\u4eab\u540c\u4e00\u4e2a\u540d\u79f0\uff0c\u4f1a\u5728\u6821\u9a8c\u65f6\u629b\u51fa\u9519\u8bef\u3002<\/section>\n
            <\/h3>\n
            \u8d44\u6e90<\/strong><\/h3>\n
            \u5b9aInit \u5bb9\u5668\u7684\u6267\u884c\u987a\u5e8f\u4e0b\uff0c\u8d44\u6e90\u4f7f\u7528\u9002\u7528\u4e8e\u5982\u4e0b\u89c4\u5219\uff1a<\/p>\n