如何更改 Kubernetes hostpath-provisioner 挂载路径？

Question

使用 MicroK8s 的存储附加组件，持久卷声明默认在主机系统上的 /var/snap/microk8s/common/default-storage 下提供存储。怎么改？

查看hostpath-provisioner pod 的声明，显示有一个名为PV_DIR 的环境设置指向/var/snap/microk8s/common/default-storage - 似乎是我想要更改的内容，但怎么做？

不确定我是在问 MicroK8s 的具体问题，还是一般来说这是否适用于 Kubernetes？

$ microk8s.kubectl describe -n kube-system pod/hostpath-provisioner-7b9cb5cdb4-q5jh9

Name:         hostpath-provisioner-7b9cb5cdb4-q5jh9
Namespace:    kube-system
Priority:     0
Node:         ...
Start Time:   ...
Labels:       k8s-app=hostpath-provisioner
              pod-template-hash=7b9cb5cdb4
Annotations:  <none>
Status:       Running
IP:           ...
IPs:
  IP:           ...
Controlled By:  ReplicaSet/hostpath-provisioner-7b9cb5cdb4
Containers:
  hostpath-provisioner:
    Container ID:   containerd://0b74a5aa06bfed0a66dbbead6306a0bc0fd7e46ec312befb3d97da32ff50968a
    Image:          cdkbot/hostpath-provisioner-amd64:1.0.0
    Image ID:       docker.io/cdkbot/hostpath-provisioner-amd64@sha256:339f78eabc68ffb1656d584e41f121cb4d2b667565428c8dde836caf5b8a0228
    Port:           <none>
    Host Port:      <none>
    State:          Running
      Started:      ...
    Last State:     Terminated
      Reason:       Unknown
      Exit Code:    255
      Started:      ...
      Finished:     ...
    Ready:          True
    Restart Count:  3
    Environment:
      NODE_NAME:   (v1:spec.nodeName)
      PV_DIR:     /var/snap/microk8s/common/default-storage
    Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from microk8s-hostpath-token-nsxbp (ro)
      /var/snap/microk8s/common/default-storage from pv-volume (rw)
Conditions:
  Type              Status
  Initialized       True 
  Ready             True 
  ContainersReady   True 
  PodScheduled      True 
Volumes:
  pv-volume:
    Type:          HostPath (bare host directory volume)
    Path:          /var/snap/microk8s/common/default-storage
    HostPathType:  
  microk8s-hostpath-token-nsxbp:
    Type:        Secret (a volume populated by a Secret)
    SecretName:  microk8s-hostpath-token-nsxbp
    Optional:    false
QoS Class:       BestEffort
Node-Selectors:  <none>
Tolerations:     node.kubernetes.io/not-ready:NoExecute for 300s
                 node.kubernetes.io/unreachable:NoExecute for 300s
Events:          <none>

Answer 1

主机路径

如果您想将自己的路径添加到您的 persistentVolume 您可以使用spec.hostPath.path 值

示例 yamls

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: base                 
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: Immediate

apiVersion: v1
kind: PersistentVolume
metadata:
  name: task-pv-volume
  labels:
    type: local
spec:
  storageClassName: base
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: task-pv-claim
spec:
  storageClassName: base
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3Gi

温馨提示

根据安装方法，您的 Kubernetes 集群可能会使用标记为默认的现有 StorageClass 进行部署。然后，此默认 StorageClass 用于为不需要任何特定存储类的 PersistentVolumeClaims 动态配置存储。详情请见PersistentVolumeClaim documentation。

您可以使用

检查您的存储类

kubectl get storageclass

如果没有<your-class-name>(default)，则表示您需要自己创建默认存储类。

将 StorageClass 标记为默认值：

kubectl patch storageclass <your-class-name> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'

在你默认storageClass之后你可以使用那些yamls来创建pv和pvc

apiVersion: v1
kind: PersistentVolume
metadata:
  name: task-pv-volume3
  labels:
    type: local
spec:
  storageClassName: ""
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data2"

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: task-pv-claim3
spec:
  storageClassName: ""
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3Gi

每个 pvc 一个 pv

基于kubernetes documentation

一旦绑定，PersistentVolumeClaim 绑定是独占的，无论它们是如何绑定的。 PVC 到 PV 的绑定是一对一的映射。