是否可以将不同的 pod 挂载到本地持久卷的同一部分？

Question

基本上，我正在创建一个带有 2 个 pod（单个主机集群）的 StatefulSet 部署，我希望每个 pod 都能够挂载到主机中的基本文件夹以及它下面的子文件夹：

基础文件夹挂载：/mnt/disks/ssd

Pod#1 - /mnt/disks/ssd/pod-1

Pod#2 - /mnt/disks/ssd/pod-2

我只设法将第一个 pod 挂载到基本文件夹，但无法挂载第二个文件夹（因为该卷已被占用）

这是音量：

apiVersion: v1
kind: PersistentVolume
metadata:
  name: example-local-pv
spec:
  capacity:
    storage: 5Gi 
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Delete
  storageClassName: local-storage
  local:
    path: /mnt/disks/ssd
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - ubuntukuber

这是有状态集中的用法：

apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: app
  namespace: test-ns
spec:
  serviceName: app
  replicas: 2
....
....
        volumeMounts:
          - name: data
            mountPath: /var/lib/app/data
volumeClaimTemplates:
    - metadata:
        name: data
      spec:
        accessModes: [ "ReadWriteOnce" ]
        storageClassName: "local-storage"
        resources:
          requests:
            storage: 2Gi

所以，我基本上希望每个副本都使用自己的子文件夹 - 如何实现它？

== 编辑 ==

我已经取得了一些进展，我可以使用以下 YAML 将多个副本挂载到同一个挂载中（我尝试在其上执行此操作的应用程序是 rabbitmq - 所以我将应用程序名称保留为是）

---
kind: PersistentVolume
apiVersion: v1
metadata:
  name: pv-local
  namespace: test-rabbitmq
  labels:
    type: local
spec:
  storageClassName: local
  capacity:
    storage: 6Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/disks"
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: hostpath-pvc
  namespace: test-rabbitmq
spec:
  storageClassName: local
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 3Gi
  selector:
    matchLabels:
      type: local
---

在 StatefulSet 中，我声明了这个卷：

  volumes:
    - name: rabbitmq-data
      persistentVolumeClaim:
        claimName: hostpath-pvc

并安装“rabbitmq-data”。

两个 pod 都挂载到同一个文件夹，但不会创建子文件夹 - 这不是什么可怕的情况，因为默认情况下有 rabbitmq 的子文件夹 - 我会尝试将它扩展到每个 pod 以使用子文件夹

Answer 1

我能够实现上述场景，您需要的是您的 pv 中的“claimRef”来绑定您的 PVC。请看下面的 pv json 和 statefulset json

PV-0.json

{
  "kind": "PersistentVolume",
  "apiVersion": "v1",
  "metadata": {
    "name": "pv-data-vol-0",
    "labels": {
      "type": "local"
    }
  },
  "spec": {
    "capacity": {
      "storage": "10Gi"
    },
    "accessModes": [
      "ReadWriteOnce"
    ],
    "storageClassName": "local-storage",
    "local": {
      "path": "/prafull/data/pv-0"
    },
    "claimRef": {
      "namespace": "default",
      "name": "data-test-sf-0"
    },
    "nodeAffinity": {
      "required": {
        "nodeSelectorTerms": [
          {
            "matchExpressions": [
              {
                "key": "kubernetes.io/hostname",
                "operator": "In",
                "values": [
                  "ip-10-0-1-46.ec2.internal"
                ]
              }
            ]
          }
        ]
      }
    }
  }
}

PV-1.json

{
  "kind": "PersistentVolume",
  "apiVersion": "v1",
  "metadata": {
    "name": "pv-data-vol-1",
    "labels": {
      "type": "local"
    }
  },
  "spec": {
    "capacity": {
      "storage": "10Gi"
    },
    "accessModes": [
      "ReadWriteOnce"
    ],
    "storageClassName": "local-storage",
    "local": {
      "path": "/prafull/data/pv-1"
    },
    "claimRef": {
      "namespace": "default",
      "name": "data-test-sf-1"
    },
    "nodeAffinity": {
      "required": {
        "nodeSelectorTerms": [
          {
            "matchExpressions": [
              {
                "key": "kubernetes.io/hostname",
                "operator": "In",
                "values": [
                  "ip-10-0-1-46.ec2.internal"
                ]
              }
            ]
          }
        ]
      }
    }
  }
}

Statefulset.json

{
  "kind": "StatefulSet",
  "apiVersion": "apps/v1beta1",
  "metadata": {
    "name": "test-sf",
    "labels": {
      "state": "test-sf"
    }
  },
  "spec": {
    "replicas": 2,
    "template": {
      "metadata": {
        "labels": {
          "app": "test-sf"
        },
        "annotations": {
          "pod.alpha.kubernetes.io/initialized": "true"
        }
      }
      ...
      ...
    },
    "volumeClaimTemplates": [
      {
        "metadata": {
          "name": "data"
        },
        "spec": {
          "accessModes": [
            "ReadWriteOnce"
          ],
          "storageClassName": "local-storage",
          "resources": {
            "requests": {
              "storage": "10Gi"
            }
          }
        }
      }
    ]
  }
}

将创建两个 pod，test-sf-0 和 test-sf-1，然后创建两个 PVC data-test-sf-0 和 data-test-sf-1，它们将绑定到 PV分别为 -0 和 Pv-1。因此 test-sf-0 将写入 PV-0 中指定的位置，而 test-sf-1 将写入 PV-1 中指定的位置。希望这会有所帮助。