#我的新年Flag#K8s PVC

Posted 2023-02-14

PV

PersistentVolume: 集群中的一块存储，由管理员配置或使用存储类动态配置。 

PVC

PersistentVolumeClaim: 是一个持久化存储卷，我们在创建pod时
可以定义这个类型的存储卷。

nfs 创建共享目录

[root@k8smaster5 /]# mkdir /data/volume_test/v1,2,3,4,5,6,7,8,9,10 -p

共享目录导入nfs配置文件

[root@k8smaster5 etc]# vi exports
/data/volumes *(rw,no_root_squash)
/data/volumes_test/v1 *(rw,no_root_squash)
/data/volumes_test/v2 *(rw,no_root_squash)
/data/volumes_test/v3 *(rw,no_root_squash)
/data/volumes_test/v4 *(rw,no_root_squash)
/data/volumes_test/v5 *(rw,no_root_squash)
/data/volumes_test/v6 *(rw,no_root_squash)
/data/volumes_test/v7 *(rw,no_root_squash)
/data/volumes_test/v8 *(rw,no_root_squash)
/data/volumes_test/v9 *(rw,no_root_squash)
/data/volumes_test/v10 *(rw,no_root_squash)

nfs配置生效

[root@k8smaster5 etc]# exportfs -arv
exporting *:/data/volume_test/v10
exporting *:/data/volume_test/v9
exporting *:/data/volume_test/v8
exporting *:/data/volume_test/v7
exporting *:/data/volume_test/v6
exporting *:/data/volume_test/v5
exporting *:/data/volume_test/v4
exporting *:/data/volume_test/v3
exporting *:/data/volume_test/v2
exporting *:/data/volume_test/v1
exporting *:/data/volumes

创建PV Yaml

[root@k8smaster4 dir]# cat pv.yaml 
apiVersion: v1
kind: PersistentVolume
metadata:
  name: v1
  labels:
    app: v1
spec:
  nfs:
    server: 192.168.0.220
    path: /data/volume_test/v1
  accessModes: ["ReadWriteOnce"]
  capacity:
    storage: 1Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: v2
  labels:
    app: v2
spec:
  nfs:
    server: 192.168.0.220
    path: /data/volume_test/v2
  accessModes: ["ReadOnlyMany"]
  capacity:
    storage: 2Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: v3
  labels:
    app: v3
spec:
  nfs:
    server: 192.168.0.220
    path: /data/volume_test/v3
  accessModes: ["ReadWriteMany"]
  capacity:
    storage: 1Gi

查看创建结果

[root@k8smaster4 dir]# kubectl get pv
NAME   CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM   STORAGECLASS   REASON   AGE
v1     1Gi        RWO            Retain           Available                                   65s
v2     2Gi        ROX            Retain           Available                                   65s
v3     1Gi        RWX            Retain           Available                                   65s

创建PVC Yaml

[root@k8smaster4 dir]# cat pvc.yaml 
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-v1
spec:
  accessModes: ["ReadWriteOnce"]
  selector:
    matchLabels:
      app: v1
  resources:
    requests: 1Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-v2
spec:
  accessModes: ["ReadOnlyMany"]
  selector:
    matchLabels:
      app: v2
  resources:
    requests: 2Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-v3
spec:
  accessModes: ["ReadWriteMany"]
  selector:
    matchLabels:
      app: v3
  resources:
    requests: 1Gi

查看PVC创建结果

[root@k8smaster4 dir]# kubectl get pvc
NAME     STATUS   VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
pvc-v1   Bound    v1       1Gi        RWO                           5s
pvc-v2   Bound    v2       2Gi        ROX                           5s
pvc-v3   Bound    v3       1Gi        RWX                           5s

Pod挂载PVC

[root@k8smaster4 dir]# cat pod-pvc.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  name: pvc-test
spec:
  replicas: 3
  selector:
    matchLabels:
      cunchu: pvc
  template:
    metadata:
      labels:
        cunchu: pvc
    spec:
      containers:
      - name: test-pvc
        image: docker.io/library/nginx
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
          protocol: TCP
        volumeMounts:
        - name: nginx-html
          mountPath: /usr/share/nginx/html
      volumes:
      - name: nginx-html
        persistentVolumeClaim: 
          claimName: pvc-v1