Kubernetes yaml部署-无法创建符号链接

Question

我正在尝试进行nginx部署，在容器创建过程中，我希望创建多个符号链接。但由于某种原因，它不能工作，集装箱崩溃。

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: tcc
    component: nginx
  name: tcc-nginx-deployment
  namespace: dev2
spec:
  replicas: 1
  selector:
    matchLabels:
      app: tcc
      component: nginx
  template:
    metadata:
      labels:
        app: tcc
        component: nginx
    spec:
      containers:
      - image: nginx
        name: nginx
        command:
              - /bin/sh
              - -c
              - |
                ln -s /shared/apps/ /var/www
                rm -r /etc/nginx/conf.d
                ln -s /shared/nginx-config/ /etc/nginx/conf.d

        ports:
        - containerPort: 80
          protocol: TCP
        volumeMounts:
        - mountPath: /shared
          name: efs-pvc
      volumes:
      - name: efs-pvc
        persistentVolumeClaim:
          claimName: tcc-efs-storage-claim

Answer 1

容器没有运行，因为在执行command块之后，容器就退出了，这是预期的行为。

与其在yaml模板中使用command中的符号链接(这不是最佳实践解决方案)，为什么不使用解决方案内置的Kubernetes，而且根本不使用command块？

你应该使用subPath which is designed to share directories from one volume for multiple, different directories on the single pod

有时候，在一个

中共享一个卷用于多个用途是很有用的。volumeMounts.subPath属性指定引用卷内的子路径，而不是根.

在您的例子中，部署yaml应该如下所示：

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: tcc
    component: nginx
  name: tcc-nginx-deployment
  namespace: dev2
spec:
  replicas: 1
  selector:
    matchLabels:
      app: tcc
      component: nginx
  template:
    metadata:
      labels:
        app: tcc
        component: nginx
    spec:
      containers:
      - image: nginx
        name: nginx
        ports:
        - containerPort: 80
          protocol: TCP
        volumeMounts:
        - mountPath: /shared
          name: efs-pvc
        - mountPath: /etc/nginx/conf.d
          name: efs-pvc
          subPath: nginx-config
        - mountPath: /var/www
          name: efs-pvc
          subPath: apps
      volumes:
      - name: efs-pvc
        persistentVolumeClaim:
          claimName: tcc-efs-storage-claim

另外，如果您只想为NGINX挂载配置文件，您可以使用ConfigMap而不是卷检查this answer来获取更多信息。

Answer 2

• ，这是因为您只要求容器创建符号链接。所以一旦那些

创建了符号链接，容器正在退出。

• 以避免添加"nginx" "-g" "daemon off;"，如下所示：

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: tcc
    component: nginx
  name: tcc-nginx-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: tcc
      component: nginx
  template:
    metadata:
      labels:
        app: tcc
        component: nginx
    spec:
      containers:
      - image: nginx
        name: nginx
        imagePullPolicy: IfNotPresent
        command:
              - /bin/sh
              - -c
              - |
                ln -s /shared/apps/ /var/www
                rm -r /etc/nginx/conf.d
                ln -s /shared/nginx-config/ /etc/nginx/conf.d
                "nginx" "-g" "daemon off;" ; # after creating above symbolic links it will start nginx daemon 
        ports:
        - containerPort: 80
          protocol: TCP
        volumeMounts:
        - mountPath: /shared
          name: efs-pvc
      volumes:
      - name: efs-pvc
        persistentVolumeClaim:
          claimName: tcc-efs-storage-claim