2.3.1. PV/PVC定义和使用-Kubernets合辑7-存储

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准备NFS存储

```
[root@hdss7-200 volume]# showmount -e 
Export list for hdss7-200.host.com:
/tmp/data/websit/03 10.4.7.0/24
/tmp/data/websit/02 10.4.7.0/24
/tmp/data/websit/01 10.4.7.0/24
```

定义PV

```
[root@hdss7-200 volume]# cat /data/k8s-yaml/base_resource/volume/pv.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-pv001
  labels:
    type: SSD
    fs: nfs
    speed: fast
spec:
  accessModes:
  - ReadWriteMany
  - ReadWriteOnce
  - ReadOnlyMany
  capacity:
    storage: 5Gi
  nfs:
    server: hdss7-200
    path: /tmp/data/websit/01
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-pv002
  labels:
    type: SSD
    fs: nfs
    speed: slow
spec:
  accessModes:
  - ReadWriteMany
  - ReadOnlyMany
  capacity:
    storage: 5Gi
  nfs:
    server: hdss7-200
    path: /tmp/data/websit/02
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-pv003
  labels:
    type: SSD
    fs: nfs
    speed: slow
spec:
  accessModes:
  - ReadWriteMany
  - ReadWriteOnce
  capacity:
    storage: 10Gi
  nfs:
    server: hdss7-200
    path: /tmp/data/websit/03
```

定义PVC和deployment

```
[root@hdss7-200 volume]# cat /data/k8s-yaml/base_resource/volume/pvc-depolyment.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: website-root-pvc
  namespace: app
  labels:
    tier: website
    type: nfs
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 5Gi
  selector:
    matchLabels:
      fs: nfs
      speed: fast
---
apiVersion: apps/v1
kind: Deployment
metadata: 
  name: pvc-deploy
  namespace: app
  labels:
    tier: volume
    role: nfs
spec:
  replicas: 2
  selector:
    matchLabels:
      tier: volume
      role: nfs
  template:
    metadata: 
      labels:
        tier: volume
        role: nfs
    spec:
      containers:
      - name: main-container
        image: harbor.od.com/public/busybox:v1.31.1
        volumeMounts:
        - name: web-root
          mountPath: /data/web/html
        command:
        - httpd
        args:
        - -f
        - -h 
        - "/data/web/html"
      volumes:
      - name: web-root
        persistentVolumeClaim: 
          claimName: website-root-pvc

```

创建

```
[root@hdss7-21 ~]# kubectl apply -f http://k8s-yaml.od.com/base_resource/volume/pv.yaml
[root@hdss7-21 ~]# kubectl apply -f http://k8s-yaml.od.com/base_resource/volume/pvc-depolyment.yaml
[root@hdss7-21 ~]# kubectl get pv --show-labels
NAME        CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM                  STORAGECLASS   REASON   AGE   LABELS
nfs-pv001   5Gi        RWO,ROX,RWX    Retain           Bound       app/website-root-pvc                           25m   fs=nfs,speed=fast,type=SSD
nfs-pv002   5Gi        ROX,RWX        Retain           Available                                                  25m   fs=nfs,speed=slow,type=SSD
nfs-pv003   10Gi       RWO,RWX        Retain           Available                                                  25m   fs=nfs,speed=slow,type=SSD
[root@hdss7-21 ~]# kubectl get pvc -n app
NAME               STATUS   VOLUME      CAPACITY   ACCESS MODES   STORAGECLASS   AGE
website-root-pvc   Bound    nfs-pv001   5Gi        RWO,ROX,RWX                   13m
[root@hdss7-21 ~]# kubectl get pod -l tier=volume -n app -o wide
NAME                          READY   STATUS    RESTARTS   AGE     IP            NODE                NOMINATED NODE   READINESS GATES
pvc-deploy-86847c7b6b-mqvm5   1/1     Running   0          14m     172.7.21.11   hdss7-21.host.com   <none>           <none>
pvc-deploy-86847c7b6b-x4p6m   1/1     Running   0          8m56s   172.7.22.8    hdss7-22.host.com   <none>           <none>
```

测试

```
[root@hdss7-21 ~]# kubectl exec pvc-deploy-86847c7b6b-mqvm5 -n app -- /bin/sh -c "echo 'hello world' > /data/web/html/index.html"
[root@hdss7-21 ~]# curl -s 172.7.21.11;curl -s 172.7.22.8  # 主页文件已生成
hello world
hello world
[root@hdss7-21 ~]# kubectl delete pod pvc-deploy-86847c7b6b-mqvm5 pvc-deploy-86847c7b6b-x4p6m -n app
pod "pvc-deploy-86847c7b6b-mqvm5" deleted
pod "pvc-deploy-86847c7b6b-x4p6m" deleted
[root@hdss7-21 ~]# kubectl get pod -l tier=volume -n app -o wide 
NAME                          READY   STATUS    RESTARTS   AGE   IP            NODE                NOMINATED NODE   READINESS GATES
pvc-deploy-86847c7b6b-7gqqs   1/1     Running   0          62s   172.7.21.12   hdss7-21.host.com   <none>           <none>
pvc-deploy-86847c7b6b-drm28   1/1     Running   0          62s   172.7.22.11   hdss7-22.host.com   <none>           <none>
[root@hdss7-21 ~]# curl -s 172.7.21.12; curl -s 172.7.22.11 # Pod删除重建后，文件依旧存在
hello world
hello world
```

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