Kubernetes Permission for mount nfs 卷被拒绝

Question

以下是使用的k8s定义：

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: nfs-pv-provisioning-demo
labels:
demo: nfs-pv-provisioning
spec:
accessModes: [ "ReadWriteOnce" ]
resources:
requests:
storage: 200Gi
---
apiVersion: v1
kind: ReplicationController
metadata:
name: nfs-server
spec:
securityContext:
runAsUser: 1000
fsGroup: 2000
replicas: 1
selector:
role: nfs-server
template:
metadata:
labels:
role: nfs-server
spec:
containers:
- name: nfs-server
image: k8s.gcr.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
spec:
ports:
- name: nfs
port: 2049
- name: mountd
port: 20048
- name: rpcbind
port: 111
selector:
role: nfs-server
---
apiVersion: v1
kind: PersistentVolume
metadata:
name: nfs
spec:
capacity:
storage: 1Gi
accessModes:
- ReadWriteMany
nfs:
# FIXME: use the right IP
server: nfs-server
path: "/"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: nfs
spec:
accessModes:
- ReadWriteMany
storageClassName: ""
resources:
requests:
storage: 1Gi
---
# This mounts the nfs volume claim into /mnt and continuously
# overwrites /mnt/index.html with the time and hostname of the pod.
apiVersion: v1
kind: ReplicationController
metadata:
name: nfs-busybox
spec:
securityContext:
runAsUser: 1000
fsGroup: 2000
replicas: 2
selector:
name: nfs-busybox
template:
metadata:
labels:
name: nfs-busybox
spec:
containers:
- image: busybox
command:
- sh
- -c
- 'while true; do date > /mnt/index.html; hostname >> /mnt/index.html; sleep $(($RANDOM % 5 + 5)); done'
imagePullPolicy: IfNotPresent
name: busybox
volumeMounts:
# name must match the volume name below
- name: nfs
mountPath: "/mnt"
volumes:
- name: nfs
persistentVolumeClaim:
claimName: nfs

现在 nfs-busybox 中的/mnt 目录应该有 2000 作为 gid(根据文档(。但它仍然将根和根作为用户和组。由于应用程序以 1000/2000 运行，因此无法在/mnt 目录中创建任何日志或数据。

CHMOD可能会解决这个问题，但它看起来像是变通方法。对此有什么永久的解决方案吗？

观察：如果我用其他一些 PVC 替换 nfs，它的工作正常，如文档中所述。

Answer 1

你试过 initContainers 方法吗？它修复了导出目录的权限：

initContainers:
- name: volume-mount-hack
image: busybox
command: ["sh", "-c", "chmod -R 777 /exports"]
volumeMounts:
- name: nfs
mountPath: /exports 

如果您在 Linux 盒子上使用独立的 NFS 服务器，我建议使用no_root_squash选项：

/exports *(rw,no_root_squash,no_subtree_check)

要管理 nfs 服务器上的目录权限，需要更改安全上下文并将其提升到特权模式：

apiVersion: v1
kind: Pod
metadata:
name: nfs-server
labels:
role: nfs-server
spec:
containers:
- name: nfs-server
image: nfs-server
ports:
- name: nfs
containerPort: 2049
securityContext:
privileged: true