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无法通过服务端点访问 Kubernetes NFS 服务器

tag-icon • tag-icon kubernetes nfs
无法通过服务端点访问 Kubernetes NFS 服务器

我已经使用以下清单部署了 NFS 服务器

---

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: nfs-pv-provisioning-demo
  namespace: nfs
  labels:
    role: nfs-server
spec:
  storageClassName: aws-gp3
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nfs-server
  namespace: nfs
spec:
  replicas: 1
  selector:
    matchLabels:
      role: nfs-server
  template:
    metadata:
      labels:
        role: nfs-server
    spec:
      containers:
      - name: nfs-server
        image: registry.k8s.io/volume-nfs:0.8
        ports:
          - name: nfs
            containerPort: 2049
          - name: mountd
            containerPort: 20048
          - name: rpcbind
            containerPort: 111
        securityContext:
          privileged: true
        volumeMounts:
          - mountPath: /exports
            name: mypvc
      volumes:
        - name: mypvc
          persistentVolumeClaim:
            claimName: nfs-pv-provisioning-demo

---

kind: Service
apiVersion: v1
metadata:
  name: nfs-server
  namespace: nfs
spec:
  ports:
    - name: nfs
      port: 2049
    - name: mountd
      port: 20048
    - name: rpcbind
      port: 111
  selector:
    role: nfs-server

---

但当我将其用作nfs-server.nfs.svc.cluster.local服务器名称时，它无法解析它。当我将 Cluster IP 用作服务端点时，它就可以正常工作。

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs
  namespace: nfs
spec:
  capacity:
    storage: 1Mi
  accessModes:
    - ReadWriteMany
  nfs:
    server: nfs-server.nfs.svc.cluster.local
    # server: 172.20.144.30
    path: "/"
  mountOptions:
    - nfsvers=4.2

知道这个设置有什么问题吗？

答案1

这是 Kubernetes 中的一个已知错误：可能是在 pod 能够访问内部 DNS 之前设置 NFS 服务器的初始化问题。

肮脏的解决方案：如果你想保留，你可以在每个节点上使用IP 旁边的nfs-server.nfs.svc.cluster.local/etc/hosts 文件进行编辑：nfs-server.nfs.svc.cluster.local

$ cat /etc/hosts
##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost
255.255.255.255 broadcasthost
::1             localhost
172.20.144.30   nfs-server.nfs.svc.cluster.local

您可以在这里找到更多信息：https://github.com/kubernetes/minikube/issues/3417或通过谷歌搜索server: nfs-server.nfs.svc.cluster.local

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