Multiple Volume mounts with Kubernetes: one works, one doesn't

问题

I am trying to create a Kubernetes pod with a single container which has two external volumes mounted on it. My .yml pod file is:

apiVersion: v1
kind: Pod
metadata:
  name: my-project
  labels:
    name: my-project
spec:
  containers:
    - image: my-username/my-project
      name: my-project
      ports:
        - containerPort: 80
          name: nginx-http
        - containerPort: 443
          name: nginx-ssl-https
      imagePullPolicy: Always
      volumeMounts:
        - mountPath: /home/projects/my-project/media/upload
          name: pd-data
        - mountPath: /home/projects/my-project/backups
          name: pd2-data
  imagePullSecrets:
    - name: vpregistrykey
  volumes:
    - name: pd-data
      persistentVolumeClaim:
        claimName: pd-claim
    - name: pd2-data
      persistentVolumeClaim:
        claimName: pd2-claim

I am using Persistent Volumes and Persisten Volume Claims, as such: PV

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pd-disk
  labels:
    name: pd-disk
spec:
  capacity:
    storage: 250Gi
  accessModes:
    - ReadWriteOnce
  gcePersistentDisk:
    pdName: "pd-disk"
    fsType: "ext4"

PVC

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: pd-claim
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 250Gi

I have initially created my disks using the command: $ gcloud compute disks create --size 250GB pd-disk Same goes for the second disk and second PV and PVC. Everything seems to work ok when I create the pod, no errors are thrown. Now comes the weird part: one of the paths is being mounted correctly (and is therefor persistent) and the other one is being erased every time I restart the pod...

I have tried re-creating everything from scratch, but nothing changes. Also, from the pod description, both volumes seem to be correctly mounted:

$ kubectl describe pod my-project
Name:       my-project
...
Volumes:
  pd-data:
    Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
    ClaimName:  pd-claim
    ReadOnly: false
  pd2-data:
    Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
    ClaimName:  pd2-claim
    ReadOnly: false

Any help is appreciated. Thanks.

回答1:

The Kubernetes documentation states:

Volumes can not mount onto other volumes or have hard links to other volumes

I had the same issue and in my case the problem was that both volume mounts had overlapping mountPaths, i.e. both started with /var/.

They mounted without issues after fixing that.

回答2:

I do not see any direct problem for which such behavior as explained above has occurred! But what I can rather ask you to try is to use a "Deployment" instead of a "Pod" as suggested by many here, especially when using PVs and PVCs. Deployment takes care of many things to maintain the "Desired State". I have attached my code below for your reference which works and both the volumes are persistent even after deleting/terminating/restarting as this is managed by the Deployment's desired state.

Two difference which you would find in my code from yours are:

1. I have a deployment object instead of pod
2. I am using GlusterFs for my volume.

Deployment yml.

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: nginx
  namespace: platform
  labels:
    component: nginx
spec:
  replicas: 2
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxSurge: 1
      maxUnavailable: 1
  template:
    metadata:
      labels:
        component: nginx
    spec:
      nodeSelector:
        role: app-1
      containers:
        - name: nginx
          image: vip-intOAM:5001/nginx:1.15.3
          imagePullPolicy: IfNotPresent
          volumeMounts:
          - mountPath: "/etc/nginx/conf.d/"
            name: nginx-confd
          - mountPath: "/var/www/"
            name: nginx-web-content
      volumes:
      - name: nginx-confd
        persistentVolumeClaim:
          claimName: glusterfsvol-nginx-confd-pvc
      - name: nginx-web-content
        persistentVolumeClaim:
          claimName: glusterfsvol-nginx-web-content-pvc

One of my PV

apiVersion: v1
kind: PersistentVolume
metadata:
  name: glusterfsvol-nginx-confd-pv
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  glusterfs:
    endpoints: gluster-cluster
    path: nginx-confd
    readOnly: false
  persistentVolumeReclaimPolicy: Retain
  claimRef:
    name: glusterfsvol-nginx-confd-pvc
    namespace: platform

PVC for the above

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: glusterfsvol-nginx-confd-pvc
  namespace: platform
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi

来源：https://stackoverflow.com/questions/35443649/multiple-volume-mounts-with-kubernetes-one-works-one-doesnt