如何在Google Container Engine上创建Kubernetes NFS卷 [英] How to create an kubernetes NFS volume on Google Container Engine

问题描述

我正在尝试在Google Container Engine(GKE)上创建Kubernetes NFS卷，并将其用于部署。

如此GitHub存储库kubernetes-nfs-volume-on-gke所示，我分几个步骤完成了此操作：

1. 创建GKE集群和GCE持久盘
2. 配置kubectl的上下文以处理GKE集群
3. 创建PersistentVolume(PV)和PersistentVolumeClaim(PVC)
4. 创建NFS服务器
5. 为NFS服务器创建一个服务以公开它(该服务的IP地址用于创建NFS PV和NFS PVC)
6. 创建NFS卷
7. 创建Busybox部署以检查NFS卷是否可访问。

执行这些步骤后，得到的错误如下：

$ kubectl describe pods  nfs-busybox-2762569073-lhb5p
Name:       nfs-busybox-2762569073-lhb5p
Namespace:  default
Node:       gke-mappedinn-cluster-default-pool-f94cb0d4-fmfb/10.240.0.3
Start Time: Wed, 12 Apr 2017 04:12:20 +0400
Labels:     name=nfs-busybox
        pod-template-hash=2762569073
Annotations:    kubernetes.io/created-by={"kind":"SerializedReference","apiVersion":"v1","reference":{"kind":"ReplicaSet","namespace":"default","name":"nfs-busybox-2762569073","uid":"b1e523ae-1f14-11e7-a084-42010a8e0...
        kubernetes.io/limit-ranger=LimitRanger plugin set: cpu request for container busybox
Status:     Pending
IP:     
Controllers:    ReplicaSet/nfs-busybox-2762569073
Containers:
  busybox:
    Container ID:
    Image:      busybox
    Image ID:       
    Port:       
    Command:
      sh
      -c
      while true; do date > /mnt/index.html; hostname >> /mnt/index.html; sleep $(($RANDOM % 5 + 5)); done
    State:      Waiting
      Reason:       ContainerCreating
    Ready:      False
    Restart Count:  0
    Requests:
      cpu:      100m
    Environment:    <none>
    Mounts:
      /mnt from my-pvc-nfs (rw)
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-20n4b (ro)
Conditions:
  Type      Status
  Initialized   True
  Ready     False
  PodScheduled  True
Volumes:
  my-pvc-nfs:
    Type:   PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
    ClaimName:  nfs
    ReadOnly:   false
  default-token-20n4b:
    Type:   Secret (a volume populated by a Secret)
    SecretName: default-token-20n4b
    Optional:   false
QoS Class:  Burstable
Node-Selectors: <none>
Tolerations:    <none>
Events:
  FirstSeen LastSeen    Count   From                                SubObjectPath   Type        Reason      Message
  --------- --------    -----   ----                                -------------   --------    ------      -------
  5m        5m      1   default-scheduler                               Normal      Scheduled   Successfully assigned nfs-busybox-2762569073-lhb5p to gke-mappedinn-cluster-default-pool-f94cb0d4-fmfb
  3m        48s     2   kubelet, gke-mappedinn-cluster-default-pool-f94cb0d4-fmfb           Warning     FailedMount Unable to mount volumes for pod "nfs-busybox-2762569073-lhb5p_default(b1e7c901-1f14-11e7-a084-42010a8e0116)": timeout expired waiting for volumes to attach/mount for pod "default"/"nfs-busybox-2762569073-lhb5p". list of unattached/unmounted volumes=[my-pvc-nfs]
  3m        48s     2   kubelet, gke-mappedinn-cluster-default-pool-f94cb0d4-fmfb           Warning     FailedSync  Error syncing pod, skipping: timeout expired waiting for volumes to attach/mount for pod "default"/"nfs-busybox-2762569073-lhb5p". list of unattached/unmounted volumes=[my-pvc-nfs]
  37s       37s     1   kubelet, gke-mappedinn-cluster-default-pool-f94cb0d4-fmfb           Warning     FailedMount MountVolume.SetUp failed for volume "kubernetes.io/nfs/b1e7c901-1f14-11e7-a084-42010a8e0116-nfs" (spec.Name: "nfs") pod "b1e7c901-1f14-11e7-a084-42010a8e0116" (UID: "b1e7c901-1f14-11e7-a084-42010a8e0116") with: mount failed: exit status 32
Mounting command: /home/kubernetes/bin/mounter
Mounting arguments: 10.247.250.208:/exports /var/lib/kubelet/pods/b1e7c901-1f14-11e7-a084-42010a8e0116/volumes/kubernetes.io~nfs/nfs nfs []
Output: Running mount using a rkt fly container
run: group "rkt" not found, will use default gid when rendering images 

在Kubernetes仪表板中，错误如下：

无法装入Pod"nfs-busybox-2762569073-lhb5p_default(b1e7c901-1f14-11e7-a084-42010a8e0116)"：超时到期的卷等待Pod"Default"/"nfs-busybox-2762569073-lhb5p"的卷附加/装入。已卸载/已卸载卷的列表=[my-pvc-nfs]

同步Pod时出错，正在跳过：等待Pod"default"/"nfs-busybox-2762569073-lhb5p"的卷附加/装载超时。已卸载/已卸载卷的列表=[my-pvc-nfs]

我是否遗漏了什么？

谢谢，

推荐答案

kubernetes的issue中的comment似乎解决了gke上的这个nfs问题。

引用该评论：

编辑examples/volumes/nfs/nfs-pv.yaml将最后一行更改为路径："/"。

编辑examples/volumes/nfs/nfs-server-rc.yaml将映像更改为启用NFSv4映像的映像：gcr.io/google_containers/volume-nfs:0.8

还存在跟踪此问题的其他问题here和here。

这篇关于如何在Google Container Engine上创建Kubernetes NFS卷的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！