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  • kubernetes云平台管理实战:持久化实战(二十)

    一、创建tomcat+mysql集群

    详细过程参考博文:https://www.cnblogs.com/luoahong/p/12917822.html

    未添加数据截图如下

    二、数据库未持久化数据库重启数据丢失

    1、添加数据

    2、删除数据库容器

    [root@master tomcat_demo]# kubectl get pods
    NAME              READY     STATUS    RESTARTS   AGE
    po/mysql-3qkf1    1/1       Running   0          2d
    po/myweb-d338g    1/1       Running   0          1m
    po/myweb1-xxxqs   1/1       Running   0          1d
    [root@master tomcat_demo]# kubectl delete pod mysql-3qkf1
    pod "mysql-3qkf1" deleted
    [root@master tomcat_demo]# kubectl get pods
    NAME           READY     STATUS    RESTARTS   AGE
    mysql-8tmlv    1/1       Running   0          8s
    myweb-s7gm5    1/1       Running   0          8m
    myweb1-xxxqs   1/1       Running   0          1d

    3、再次访问数据丢失啦

    三、创建pv和pvc

    1、创建运行PV

    [root@master tomcat_demo]# cp ../volume/test-pv* .
    [root@master tomcat_demo]# ls
    mysql-rc.yml  mysql-svc.yml  test-pvc.yaml  test-pv.yaml  tomcat-rc.yml  tomcat-svc.yml
    [root@master tomcat_demo]# mv test-pv.yaml mysql-pv.yaml 
    [root@master tomcat_demo]# vim mysql-pv.yaml
    [root@master tomcat_demo]# cat mysql-pv.yaml 
    apiVersion: v1
    kind: PersistentVolume
    metadata:
      name: mysql
      labels:
        type: mysql
    spec:
      capacity:
        storage: 10Gi 
      accessModes:
        - ReadWriteMany 
      persistentVolumeReclaimPolicy: Recycle
      nfs:
        path:  "/data/mysql"
        server: 192.168.118.18
        readOnly: false
    [root@master tomcat_demo]# mkdir /data/mysql
    [root@master tomcat_demo]# kubectl create -f mysql-pv.yaml 
    persistentvolume "mysql" created
    

    2、创建运行PVC

    [root@master tomcat_demo]# mv test-pvc.yaml mysql-pvc.yaml 
    [root@master tomcat_demo]# vim mysql-pvc.yaml 
    [root@master tomcat_demo]# cat mysql-pvc.yaml
    kind: PersistentVolumeClaim
    apiVersion: v1
    metadata:
      name: mysql
    spec:
      accessModes:
        - ReadWriteMany
      resources:
        requests:
          storage: 10Gi
    [root@master tomcat_demo]# kubectl create -f  mysql-pvc.yaml 
    persistentvolumeclaim "mysql" created
    [root@master tomcat_demo]# 
    [root@master tomcat_demo]# kubectl get pvc
    NAME      STATUS    VOLUME    CAPACITY   ACCESSMODES   AGE
    mysql     Bound     mysql     10Gi       RWX           1m
    nfs       Bound     test2     5Gi        RWX           43m
    nfs2      Bound     test      10Gi       RWX           39m

    四、pod使用pvc

    创建mysql-rc-pvc.yaml

    [root@master tomcat_demo]# vim mysql-rc-pvc.yaml 
    [root@master tomcat_demo]# cat mysql-rc-pvc.yaml 
    apiVersion: v1
    kind: ReplicationController
    metadata:
      name: mysql
    spec:
      replicas: 1
      selector:
        app: mysql
      template:
        metadata:
          labels:
            app: mysql
        spec:
          containers:
            - name: mysql
              image: 192.168.118.18:5000/mysql:5.7
              ports:
              - containerPort: 3306
              env:
              - name: MYSQL_ROOT_PASSWORD
                value: '123456'
              volumeMounts:
              - name: data
                mountPath: /var/lib/mysql
          volumes:
          - name: data
            persistentVolumeClaim:
              claimName: mysql
    

     运行检查

    [root@master tomcat_demo]# kubectl apply -f mysql-rc-pvc.yaml 
    replicationcontroller "mysql" configured
    [root@master tomcat_demo]# kubectl get pods
    NAME           READY     STATUS    RESTARTS   AGE
    mysql-8stxt    1/1       Running   0          7s
    myweb-s7gm5    1/1       Running   0          29m
    myweb1-xxxqs   1/1       Running   0          1d

    四、测试持久化

    1、web页面添加数据

    2、查看共享目录

    [root@master tomcat_demo]# ls /data/mysql/
    auto.cnf  HPE_APP  ib_buffer_pool  ibdata1  ib_logfile0  ib_logfile1  ibtmp1  mysql  performance_schema  sys
    [root@master tomcat_demo]# ls /data/mysql/
    auto.cnf  HPE_APP  ib_buffer_pool  ibdata1  ib_logfile0  ib_logfile1  ibtmp1  mysql  performance_schema  sys

    3、删除数据库容器

    [root@master tomcat_demo]# kubectl delete pod mysql-8stxt
    pod "mysql-8stxt" deleted
    [root@master tomcat_demo]# kubectl get all -o wide
    NAME              READY     STATUS    RESTARTS   AGE       IP            NODE
    po/mysql-lfp5h    1/1       Running   1          4s        172.16.60.3   192.168.118.19
    po/myweb-s7gm5    1/1       Running   0          37m       172.16.56.6   192.168.118.18
    po/myweb1-xxxqs   1/1       Running   0          1d        172.16.60.2   192.168.118.19

    4、查看web界面数据依然存在

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  • 原文地址:https://www.cnblogs.com/luoahong/p/12937844.html
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