Question

下面是部署yaml，部署后，我可以访问pod 我可以看到mountPath“ / usr / share / nginx / html”，但是找不到 “ / work-dir”应该由initContainer创建。有人可以解释一下原因吗？谢谢和Rgds

apiVersion: v1
kind: Pod
metadata:
 name: init-demo
spec:
 containers:
 - name: nginx
   image: nginx
   ports:
   - containerPort: 80
   volumeMounts:
   - name: workdir
     mountPath: /usr/share/nginx/html
 # These containers are run during pod initialization
 initContainers:
 - name: install
   image: busybox
   command:
   - wget
   - "-O"
   - "/work-dir/index.html"
   - http://kubernetes.io
   volumeMounts:
   - name: workdir
     mountPath: "/work-dir"
 dnsPolicy: Default
 volumes:
 - name: workdir
   emptyDir: {}

Answer 1

“ / work-dir”中的卷由init容器安装，而“ / work-dir”位置仅存在于init容器中。当init容器完成时，其文件系统消失了，因此init容器中的“ / work-dir”目录已“消失”。应用程序（nginx）容器也安装相同的卷（尽管位于不同的位置），从而为两个容器共享其内容提供了机制。

根据docs：

初始化容器可以使用与文件系统不同的视图来运行同一容器中的应用容器。

Answer 2

带有PVC的卷装入允许您共享/work-dir/和/use/share/nginx/html/的内容，但这并不意味着nginx container将具有/work-dir文件夹。鉴于此，您可能认为您可以只安装路径/，该路径将允许您共享下面的所有文件夹。但是，mountPath不适用于/。

那么，您如何解决您的问题？如果您确实需要该文件夹，则可以使用另一个Pod挂载/work-dir/。这是一个示例（带有挂架的pvc和部署）：

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: shared-fs-pvc
  namespace: default
  labels:
    mojix.service: default-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

---
apiVersion: apps/v1
kind: Deployment
metadata:
  namespace: default
  name: shared-fs
  labels:
    mojix.service: shared-fs
spec:
  replicas: 1
  selector:
    matchLabels:
      mojix.service: shared-fs
  template:
    metadata:
      creationTimestamp: null
      labels:
        mojix.service: shared-fs
    spec:
      terminationGracePeriodSeconds: 3
      containers:
      - name: nginx-c
        image: nginx:latest
        volumeMounts:
          - name: shared-fs-volume
            mountPath: /var/www/static/
      - name: alpine-c
        image: alpine:latest
        command: ["/bin/sleep", "10000s"]
        lifecycle:
          postStart:
            exec:
              command: ["/bin/mkdir", "-p", "/work-dir"]
        volumeMounts:
          - name: shared-fs-volume
            mountPath: /work-dir/
      volumes:
      - name: shared-fs-volume
        persistentVolumeClaim:
          claimName: shared-fs-pvc

kubectl pod部署后不存在k8s initContainer mountPath

2 个答案: