K8s数据持久化

数据持久化 Volume介绍

Volume介绍：Volume是Pad中能够被多个容器访问的共享目录Kubernetes中的Volume不Pad生命周期相同，但不容器的生命周期丌相关Kubernetes支持多种类型的Volume，并且一个Pod可以同时使用任意多个VolumeVolume类型包括:- EmptyDir：Pod分配时创建， K8S自动分配，当Pod被移除数据被清空。用于临时空间等。- hostPath：为Pod上挂载宿主机目录。用于持久化数据。- nfs：挂载相应磁盘资源。

1.EmptyDir实验

EmptyDir实验cat >emptyDir.yaml <> /data/busybox/index.html;sleep 3;done"]  volumes:  - name: cache-volume    emptyDir: {}EOF

2.hostPath实验

hostPath实验1.发现的问题：- 目录必须存在才能创建- POD不固定会创建在哪个Node上，数据不统一2.type类型说明https://kubernetes.io/docs/concepts/storage/volumes/#hostpathDirectoryOrCreate  目录不存在就自动创建Directory   目录必须存在FileOrCreate   文件不存在则创建File   文件必须存在3.根据Node标签选择POD创建在指定的Node上方法1: 直接选择Node节点名称apiVersion: v1kind: Podmetadata:  name: busybox-nodenamespec:  nodeName: node2  containers:  - name: busybox-pod    image: busybox    volumeMounts:    - mountPath: /data/pod/      name: hostpath-volume    command: ["/bin/sh","-c","while true;do echo $(date) >> /data/pod/index.html;sleep 3;done"]  volumes:  - name: hostpath-volume    hostPath:      path: /data/node/      type: DirectoryOrCreate 方法2: 根据Node标签选择Node节点kubectl label nodes node3 disktype=SSDapiVersion: v1kind: Podmetadata:  name: busybox-nodenamespec:  nodeSelector:    disktype: SSD  containers:  - name: busybox-pod    image: busybox    volumeMounts:    - mountPath: /data/pod/      name: hostpath-volume    command: ["/bin/sh","-c","while true;do echo $(date) >> /data/pod/index.html;sleep 3;done"]  volumes:  - name: hostpath-volume    hostPath:      path: /data/node/      type: DirectoryOrCreate 4.实验-编写mysql的持久化deploymentapiVersion: apps/v1kind: Deploymentmetadata:  name: mysql-dp  namespace: defaultspec:  selector:    matchLabels:      app: mysql   replicas: 1  template:     metadata:      name: mysql-pod      namespace: default      labels:        app: mysql    spec:      containers:      - name: mysql-pod        image: mysql:5.7         ports:        - name: mysql-port          containerPort: 3306        env:        - name: MYSQL_ROOT_PASSWORD          value: "123456"         volumeMounts:        - mountPath: /var/lib/mysql          name: mysql-volume      volumes:      - name: mysql-volume        hostPath:          path: /data/mysql          type: DirectoryOrCreate       nodeSelector:        disktype: SSD

3.PV和PVC

PV和PVC1.master节点安装nfsyum install nfs-utils -ymkdir /data/nfs-volume -pvim /etc/exports/data/nfs-volume 10.0.0.0/24(rw,async,no_root_squash,no_all_squash)systemctl start rpcbindsystemctl start nfsshowmount -e 127.0.0.12.所有node节点安装nfsyum install nfs-utils.x86_64 -yshowmount -e 10.0.0.113.编写并创建nfs-pv资源cat >nfs-pv.yaml <mysql-pvc.yaml <mysql-dp.yaml <