K8S学习之基础二十五：k8s存储类之storageclass

k8s存储类之StorageClass

​ k8s可以通过StorageClass，动态生成一个pv供k8s的pvc使用

​ 每个StorageClass都包含字段provisioner,parameters和reclaimPolicy

​ 具体来说，StorageClass定义一下两部分：

​ 1、PV属性，比如大小、类型等

​ 2、创建PV需要使用的存储插件，如Ceph、NFS等

​

​ 以NFS为例，需要一个 nfs-client的自动装载程序，称之为provisioner，该程序会使用已经配置好的NFS服务器自动创建持久卷，也就是自动帮我们创建PV

​ raclimPolicy：回收策略，默认删除

​ 安装nfs provisioner，用于配合存储类动态生成pv，这里以pod模式运行

​ 将nfs-subdir-external-provisioner.tar.gz上传到harbor仓库

​ 创建sa，使pod可以操作k8s

vi servieaccount.yaml
serviceaccount.yaml 
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-provisioner

​ 对sa授权

kubectl create clusterrolebinding nfs-provisioner-clusterrolebinding --clusterrole=cluster-admin --serviceaccount=default:nfs-provisioner

​ 安装nfs-provisioner

# 创建目录
mkdir /data/nfs_pro -p
echo '/data/nfs_pro 172.16.80.131/24(rw,no_root_squash)' >> /etc/exports
exportfs -arv

​ 创建storageclass，动态供给pv

vi nfs-storageclass.yaml 
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs
provisioner: example.com/nfs

​ 创建pvc，绑定动态生成的pv

vi claim.yaml
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: test-claim1
spec:
  accessModes: ["ReadWriteMany"]
  resources:
    requests:
      storage: 10Mi
  storageClassName: nfs

​ 创建pod客户端

vi nfs-deployment.yaml 
kind: Deployment
apiVersion: apps/v1
metadata:
  name: nfs-provisioner
spec:
  selector:
    matchLabels:
       app: nfs-provisioner
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: nfs-provisioner
    spec:
      serviceAccount: nfs-provisioner
      containers:
        - name: nfs-provisioner
          image: 172.16.80.140/nfs-subdir-external/nfs-subdir-external-provisioner:4.0.0
          imagePullPolicy: IfNotPresent
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              value: example.com/nfs
            - name: NFS_SERVER
              value: 172.16.80.131
            - name: NFS_PATH
              value: /data/nfs_pro/
      volumes:
        - name: nfs-client-root
          nfs:
            server: 172.16.80.131
            path: /data/nfs_pro/