可以在Azure Kubernetes中将一个共享Azure磁盘挂载到多个Pod/节点上吗？ [英] Is it possible to mount a shared Azure disk in Azure Kubernetes to multiple PODs/Nodes?

问题描述

我要基于以下内容将Azure共享磁盘装载到多个部署/节点： https://docs.microsoft.com/en-us/azure/virtual-machines/disks-shared

因此，我在Azure门户中创建了一个共享磁盘，尝试将其挂载到Kubernetes中的部署时出现错误：

卷"；azuredisk"；卷的多连接错误已被Pod使用...

Kubernetes中可以使用共享磁盘吗？如果是这样的话，是怎么做的？ 谢谢你的提示。

推荐答案

Yes, you can，能力为GA。

Azure共享磁盘可以挂载为ReadWriteMany，这意味着您可以将其挂载到多个节点和Pod。它需要Azure Disk CSI driver，但需要注意的是，目前仅支持原始数据块卷，因此应用程序负责管理共享磁盘上的写、读、锁定、缓存、装载和隔离控制，共享磁盘公开为原始数据块设备。这意味着您将原始块设备(磁盘)作为volumeDevice而不是volumeMount挂载到Pod容器。

The documentation examples主要指向如何创建存储类来动态配置静态Azure共享磁盘，但我也静态创建了一个并将其挂载到不同节点上的多个Pod。

动态配置共享Azure磁盘

1. 创建存储类和PVC

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: managed-csi
provisioner: disk.csi.azure.com
parameters:
  skuname: Premium_LRS  # Currently shared disk only available with premium SSD
  maxShares: "2"
  cachingMode: None  # ReadOnly cache is not available for premium SSD with maxShares>1
reclaimPolicy: Delete
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: pvc-azuredisk
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 256Gi  # minimum size of shared disk is 256GB (P15)
  volumeMode: Block
  storageClassName: managed-csi

2. 创建具有2个副本的部署，并在Spec中指定volumeDevices、devicePath

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx
  name: deployment-azuredisk
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
      name: deployment-azuredisk
    spec:
      containers:
        - name: deployment-azuredisk
          image: mcr.microsoft.com/oss/nginx/nginx:1.17.3-alpine
          volumeDevices:
            - name: azuredisk
              devicePath: /dev/sdx
      volumes:
        - name: azuredisk
          persistentVolumeClaim:
            claimName: pvc-azuredisk

使用静态调配的Azure共享磁盘

使用通过ARM、Azure门户或Azure CLI配置的Azure共享磁盘。

1. 定义引用DiskURI和DiskName的PersistentVolume(PV)：

apiVersion: v1
kind: PersistentVolume
metadata:
  name: azuredisk-shared-block
spec:
  capacity:
    storage: "256Gi" # 256 is the minimum size allowed for shared disk
  volumeMode: Block # PV and PVC volumeMode must be 'Block'
  accessModes:
    - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  azureDisk:
    kind: Managed
    diskURI: /subscriptions/<subscription>/resourcegroups/<group>/providers/Microsoft.Compute/disks/<disk-name>
    diskName: <disk-name>
    cachingMode: None # Caching mode must be 'None'
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-azuredisk-managed
spec:
  resources:
    requests:
      storage: 256Gi
  volumeMode: Block
  accessModes:
    - ReadWriteMany
  volumeName: azuredisk-shared-block # The name of the PV (above)

对于动态配置的共享磁盘和静态配置的共享磁盘，挂载此PVC是相同的。引用上面的部署。

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