是否可以将不同的Pod安装到本地持久卷的同一部分？

Z时代
2024-01-10
分类：问答

基本上，我要创建一个带有2个Pod（单个主机群集）的StatefulSet部署，我希望每个Pod都可以挂载到主机中的基本文件夹及其下面的子文件夹中：

基本文件夹安装：/ 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，但是第二个文件夹却无法挂载（因为该卷已被占用）

这是卷：

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

这是有状态集合中的用法：

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

因此，我基本上希望每个副本都将使用其自己的子文件夹-如何实现它？

我已经取得了一些进展，我可以使用以下YAML将多个副本装载到同一装载中（我尝试在其上运行的应用是rabbitmq-因此我将其名称保持不变）

--- 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，我声明此卷：

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

并挂载“ rabbitmq-data”。

两个Pod都安装到同一文件夹，但不会创建子文件夹-这不是一个糟糕的情况，因为默认情况下有Rabbitmq的子文件夹-

我将尝试将其扩展到每个Pod中以使用子文件夹

回答：

我能够实现上述情况，您需要在pv中使用“ claimRef”来绑定PVC。请看看下面的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"
            }
          }
        }
      }
    ]
  }
}