K8s數據持久化

數據持久化 Volume介紹

Volume介紹：Volume是Pad中能夠被多個容器訪問的共享目錄Kubernetes中的Volume不Pad生命周期相同，但不容器的生命周期丌相關Kubernetes支持多種類型的Volume，并且一個Pod可以同時使用任意多個VolumeVolume類型包括:- EmptyDir：Pod分配時創建， K8S自動分配，當Pod被移除數據被清空。用于臨時空間等。- hostPath：為Pod上掛載宿主機目錄。用于持久化數據。- nfs：掛載相應磁盤資源。

1.EmptyDir實驗

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

2.hostPath實驗

hostPath實驗1.發現的問題：- 目錄必須存在才能創建- POD不固定會創建在哪個Node上，數據不統一2.type類型說明https://kubernetes.io/docs/concepts/storage/volumes/#hostpathDirectoryOrCreate  目錄不存在就自動創建Directory   目錄必須存在FileOrCreate   文件不存在則創建File   文件必須存在3.根據Node標簽選擇POD創建在指定的Node上方法1: 直接選擇Node節點名稱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: 根據Node標簽選擇Node節點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.實驗-編寫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節點安裝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節點安裝nfsyum install nfs-utils.x86_64 -yshowmount -e 10.0.0.113.編寫并創建nfs-pv資源cat >nfs-pv.yaml <mysql-pvc.yaml <mysql-dp.yaml <