K8S Strore2:PV与PVC的使用

1. 简介 2. 创建PV池 2.1 创建PV 2.2 运行 2.2 查看 3. PVC创建与绑定 3.1 创建PVC 3.1.1 创建文件 3.1.2 写一份申请书 3.1.3 删除 3.1.4 再次创建申请书 3.2 创建Pod绑定PVC 3.2.1 创建文件 3.2.2 运行文件 3.2.3 查看信息 3.2.4 测试

1. 简介

PV：持久卷（Persistence Volume），将应用需要持久化的数据保存到指定位置

PVC：持久卷申明（Persistence Volume Claim），申明需要使用的持久卷规格

2. 创建PV池


# nfs主节点
mkdir -p /nfs/data/01
mkdir -p /nfs/data/02
mkdir -p /nfs/data/03

2.1 创建PV

创建文件pv.yaml文件，输入如下内容：


apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv01-10m
spec:
  capacity:
    storage: 10M
  accessModes:
    - ReadWriteMany
  storageClassName: nfs
  nfs:
    path: /nfs/data/01
    server: 192.168.92.138
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv02-1gi
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteMany
  storageClassName: nfs
  nfs:
    path: /nfs/data/02
    server: 192.168.92.138
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv03-3gi
spec:
  capacity:
    storage: 3Gi
  accessModes:
    - ReadWriteMany
  storageClassName: nfs
  nfs:
    path: /nfs/data/03
    server: 192.168.92.138

2.2 运行


root@docker01:/home# kubectl apply -f pv.yaml

2.2 查看


 root@docker01:/home# kubectl get persistentvolume
NAME       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM   STORAGECLASS   REASON   AGE
pv01-10m   10M        RWX            Retain           Available           nfs                     2m41s
pv02-1gi   1Gi        RWX            Retain           Available           nfs                     79s
pv03-3gi   3Gi        RWX            Retain           Available           nfs                     79s

3. PVC创建与绑定

3.1 创建PVC

3.1.1 创建文件


root@docker01:/home# vim pvc.yaml


kind: PersistentVolumeClaim
apiVersion: v1
metadata: 
  name: nginx-pvc
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 200Mi
  storageClassName: nfs

3.1.2 写一份申请书


root@docker01:/home# kubectl apply -f pvc.yaml

3.1.3 删除


# 1. 删除
root@docker01:/home# kubectl delete -f pvc.yaml
# 2. 查看
root@docker01:/home# kubectl get pv

查看，在释放资源

3.1.4 再次创建申请书


root@docker01:/home# kubectl apply -f pvc.yaml

查看，由于还在释放，所以绑定了3Gi

3.2 创建Pod绑定PVC

3.2.1 创建文件

deploy-pvc.yaml


apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: nginx-deploy-pvc
  name: nginx-deploy-pvc
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx-deploy-pvc
  template:
    metadata:
      labels:
        app: nginx-deploy-pvc
    spec:
      containers:
      - image: nginx
        name: nginx
        volumeMounts:
        - name: html
          mountPath: /usr/share/nginx/html
      volumes:
        - name: html
          persistentVolumeClaim:
            claimName: nginx-pvc

claimName与申请书空间一样

3.2.2 运行文件


root@docker01:/home# kubectl apply -f deploy-pvc.yaml 
deployment.apps/nginx-deploy-pvc created

3.2.3 查看信息


root@docker01:/home# kubectl get pod
root@docker01:/home# kubectl get pvc,pv

3.2.4 测试

主机写入内容，Pod查看内容同步


root@docker01:/home# cd /nfs/data/
root@docker01:/nfs/data# ls
01  02  03  a  nginx-pv
root@docker01:/nfs/data# cd 03/
root@docker01:/nfs/data/03# ls
root@docker01:/nfs/data/03# echo "Hello,PVC and PV!" > index.html
root@docker01:/nfs/data/03#

Pod中查看，内容同步！

目前这个是PV池静态供应，后续补充PV池动态供应

这种方式适合挂载目录、文件，挂载配置文件推荐是使用ConfigMap