6.2.2. 创建初始容器

流程

1. 为初始容器创建 YAML 文件：

   apiVersion: v1
   kind: Pod
   metadata:
     name: myapp-pod
     labels:
       app: myapp
   spec:
     containers:
     - name: myapp-container
       image: registry.access.redhat.com/ubi8/ubi:latest
       command: ['sh', '-c', 'echo The app is running! && sleep 3600']
     initContainers:
     - name: init-myservice
       image: registry.access.redhat.com/ubi8/ubi:latest
       command: ['sh', '-c', 'until getent hosts myservice; do echo waiting for myservice; sleep 2; done;']
     - name: init-mydb
       image: registry.access.redhat.com/ubi8/ubi:latest
       command: ['sh', '-c', 'until getent hosts mydb; do echo waiting for mydb; sleep 2; done;']

   Copy to Clipboard Toggle word wrap

2. 为 myservice 服务创建 YAML 文件。

   kind: Service
   apiVersion: v1
   metadata:
     name: myservice
   spec:
     ports:
     - protocol: TCP
       port: 80
       targetPort: 9376

   Copy to Clipboard Toggle word wrap

3. 为 mydb 服务创建 YAML 文件。

   kind: Service
   apiVersion: v1
   metadata:
     name: mydb
   spec:
     ports:
     - protocol: TCP
       port: 80
       targetPort: 9377

   Copy to Clipboard Toggle word wrap

4. 运行以下命令来创建 myapp-pod：

   $ oc create -f myapp.yaml

   Copy to Clipboard Toggle word wrap

   输出示例

   pod/myapp-pod created

   Copy to Clipboard Toggle word wrap

5. 查看 pod 的状态：

   $ oc get pods

   Copy to Clipboard Toggle word wrap

   输出示例

   NAME                          READY     STATUS              RESTARTS   AGE
   myapp-pod                     0/1       Init:0/2            0          5s

   Copy to Clipboard Toggle word wrap

   注意 pod 状态指出它正在等待

6. 运行以下命令来创建上述服务：

   $ oc create -f mydb.yaml

   Copy to Clipboard Toggle word wrap

   $ oc create -f myservice.yaml

   Copy to Clipboard Toggle word wrap

7. 查看 pod 的状态：

   $ oc get pods

   Copy to Clipboard Toggle word wrap

   输出示例

   NAME                          READY     STATUS              RESTARTS   AGE
   myapp-pod                     1/1       Running             0          2m

   Copy to Clipboard Toggle word wrap