kubernetes持久化存储卷PersistentVolume、持久化存储卷声明PersistentVolumeClaim的使用

准备一台机器安装nfs

#安装nfs-utils
yum -y install nfs-utils
systemctl start nfs
systemctl enable nfs

# 创建目录
mkdir /data/volumes -pv
cd /data/volumes
mkdir v{1,2,3,4,5}

配置共享文件

vim /etc/exports
/data/volumes/v1 192.168.1.0/24(rw,sync,no_root_squash)
/data/volumes/v2 192.168.1.0/24(rw,sync,no_root_squash)
/data/volumes/v3 192.168.1.0/24(rw,sync,no_root_squash)
/data/volumes/v4 192.168.1.0/24(rw,sync,no_root_squash)
/data/volumes/v5 192.168.1.0/24(rw,sync,no_root_squash)

# 重新挂载/etc/exports的设置
exportfs -arv

# 显示主机的/etc/exports所共享的目录数据
showmount -e

在k8s所有的node节点上安装nfs
yum -y install nfs-utils
systemctl start nfs
systemctl enable nfs

测试下nfs功能是否正常
mkdir /v1
echo test v1 >> /v1/test.txt
#192.168.1.190是nfs主机ip
mount -t nfs 192.168.1.190:/data/volumes/v1 /v1
echo test v1 >> /v1/test.txt

# nfs节点
cat /data/volumes/v1/test.txt

node节点上的test.txt已经同步到nfs节点，No problem。

#卸载node节点上的/v1测试目录
umount /v1

在master节点上创建PersistentVolume、PersistentVolumeClaim、Pod

vim pv.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv1
  labels:
    name: pv1
spec:
  nfs:
# path 挂载路径
    path: /data/volumes/v1
# server nfs机器的ip
    server: 192.168.1.190
# ReadWriteOnce能以读写模式被加载到一个节点上
  accessModes: ["ReadWriteOnce"]
  capacity:
    storage: 2Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv2
  labels:
    name: pv2
spec:
  nfs:
    path: /data/volumes/v2
    server: 192.168.1.190
# ReadOnlyMany以只读模式加载到多个节点上
  accessModes: ["ReadOnlyMany"]
  capacity:
    storage: 5Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv3
  labels:
    name: pv3
spec:
  nfs:
    path: /data/volumes/v3
    server: 192.168.1.190
# ReadWriteMany以读写模式被加载到多个节点上    
  accessModes: ["ReadWriteMany", "ReadWriteOnce"]
  capacity:
    storage: 10Gi
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv4
  labels:
    name: pv4
spec:
  nfs:
    path: /data/volumes/v4
    server: 192.168.1.190
  accessModes: ["ReadWriteMany", "ReadWriteOnce"]
  capacity:
    storage: 10Gi

vim pod-pvc.yaml

apiVersion: v1
# 存储卷声明
kind: PersistentVolumeClaim
metadata:
  name: pvc-myapp
  namespace: default
spec:
  accessModes: ["ReadWriteMany"]
  resources:
    requests:
      storage: 1Gi
---
apiVersion: v1
kind: Pod
metadata:
  name: pod-myapp
  namespace: default
spec:
  volumes:
  - name: html
#   使用pvc-myapp存储卷声明
    persistentVolumeClaim:
      claimName: pvc-myapp
  containers:
  - name: myapp
    image: ikubernetes/myapp:v1
    volumeMounts:
    - name: html
      mountPath: /usr/share/nginx/html

部署

kubectl apply -f pv.yaml
kubectl apply -f pod-pvc.yaml

查看pv

kubectl get pv