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挂载子目录

如何在 Kubernetes 中挂载子目录

本文档展示了如何在 Kubernetes 中使用子目录挂载。

使用 subPath

社区版和云服务版的使用方式一致。

您可以在 PV 中使用 subPath：

apiVersion: v1
kind: PersistentVolume
metadata:
  name: juicefs-pv
  labels:
    juicefs-name: ten-pb-fs
spec:
  capacity:
    storage: 10Pi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  csi:
    driver: csi.juicefs.com
    volumeHandle: test-bucket
    fsType: juicefs
    nodePublishSecretRef:
      name: juicefs-secret
      namespace: default
    volumeAttributes:
      subPath: fluentd

部署 PVC 和示例 pod：

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: juicefs-pvc
  namespace: default
spec:
  accessModes:
    - ReadWriteMany
  volumeMode: Filesystem
  storageClassName: ""
  resources:
    requests:
      storage: 10Pi
  selector:
    matchLabels:
      juicefs-name: ten-pb-fs
---
apiVersion: v1
kind: Pod
metadata:
  name: juicefs-app-subpath
  namespace: default
spec:
  containers:
    - args:
        - -c
        - while true; do echo $(date -u) >> /data/out.txt; sleep 5; done
      command:
        - /bin/sh
      image: centos
      name: app
      volumeMounts:
        - mountPath: /data
          name: data
      resources:
        requests:
          cpu: 10m
  volumes:
    - name: data
      persistentVolumeClaim:
        claimName: juicefs-pvc

应用配置后，验证 pod 是否正在运行：

kubectl get pods juicefs-app-subpath

确认数据被正确地写入 JuiceFS 文件系统中：

kubectl exec -ti juicefs-app-subpath -- tail -f /data/out.txt

使用 subdir

如果您使用的是云服务版，且所用 token 只有子目录的权限，可以使用以下方式，只需要在 mountOptions 中指定 subdir=xxx：

apiVersion: v1
kind: PersistentVolume
metadata:
  name: juicefs-pv
  labels:
    juicefs-name: ten-pb-fs
spec:
  capacity:
    storage: 10Pi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  csi:
    driver: csi.juicefs.com
    volumeHandle: test-bucket
    fsType: juicefs
    nodePublishSecretRef:
      name: juicefs-secret
      namespace: default
  mountOptions:
    - subdir=/test

部署 PVC 和示例 pod：

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: juicefs-pvc
  namespace: default
spec:
  accessModes:
    - ReadWriteMany
  volumeMode: Filesystem
  storageClassName: ""
  resources:
    requests:
      storage: 10Pi
  selector:
    matchLabels:
      juicefs-name: ten-pb-fs
---
apiVersion: v1
kind: Pod
metadata:
  name: juicefs-app-subpath
  namespace: default
spec:
  containers:
    - args:
        - -c
        - while true; do echo $(date -u) >> /data/out.txt; sleep 5; done
      command:
        - /bin/sh
      image: centos
      name: app
      volumeMounts:
        - mountPath: /data
          name: data
      resources:
        requests:
          cpu: 10m
  volumes:
    - name: data
      persistentVolumeClaim:
        claimName: juicefs-pvc