使用rancher2.3.6部署mysql集群

布满荆棘的人生 2023-02-17 02:35 43阅读 0赞

> 作者：lizhonglin  
> github: https://github.com/Leezhonglin/  
> blog: https://leezhonglin.github.io

首先需要具备能够提供动态存储的存储类，我这里使用的是应用商店的`nfs-provisioner`.安装使用默认设置就行.安装好之后就能在启动这个服务的容器机器中有一个 `/srv` 目录。到时候存储的数据就都在这个文件夹中.  
安装NFS  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMTk2ODE0_size_16_color_FFFFFF_t_70_pic_center]  
准备的镜像：

gcr.azk8s.cn/google-samples/xtrabackup:1.0
    192.169.0.247:5000/dasp/mysql:5.7

> `gcr.azk8s.cn/google-samples/xtrabackup:1.0` 这个镜像国内访问不了可以使用`dockerhub`上面的`twoeo/gcr.io-google-samples-xtrabackup:1.0` 重新tag代替.

#### 1.部署`ConfigMap` ####

apiVersion: v1
    kind: ConfigMap
    metadata:
      name: mysql57
      labels:
        app: mysql57
    data:
      master.cnf: | # Apply this config only on the master. [mysqld] log-bin
      slave.cnf: | # Apply this config only on slaves. [mysqld] super-read-only

通过下图：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMTk2ODE0_size_16_color_FFFFFF_t_70_pic_center 1]  
通过如图 执行`kubectl`命令行。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMTk2ODE0_size_16_color_FFFFFF_t_70_pic_center 2]  
进入这个界面执行

kubectl describe configmap mysql57

会看到如下结果：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMTk2ODE0_size_16_color_FFFFFF_t_70_pic_center 3]

#### 2.部署Services ####

service1:

# Headless service for stable DNS entries of StatefulSet members.
    apiVersion: v1
    kind: Service
    metadata:
      name: mysql57
      labels:
        app: mysql57
    spec:
      ports:
      - name: mysql57
        port: 3306
      clusterIP: None
      selector:
        app: mysql57

service2:

# Client service for connecting to any MySQL instance for reads.
    # For writes, you must instead connect to the master: mysql-0.mysql.
    apiVersion: v1
    kind: Service
    metadata:
      name: mysql57-read
      labels:
        app: mysql57
    spec:
      ports:
      - name: mysql57
        port: 3306
      selector:
        app: mysql57

执行完成后再服务发现里面就能看见刚才添加的两个服务。

同样执行如下命令也是可以查询到的

kubectl get svc | grep mysql57

#### 3.**部署`StatefulSet`** ####

apiVersion: apps/v1
    kind: StatefulSet
    metadata:
      name: mysql57
    spec:
      selector:
        matchLabels:
          app: mysql57
      serviceName: mysql57
      replicas: 3
      template:
        metadata:
          labels:
            app: mysql57
        spec:
          initContainers:
          - name: init-mysql57
            image: 192.169.0.247:5000/dasp/mysql:5.7
            command:
            - bash
            - "-c"
            - | set -ex # Generate mysql server-id from pod ordinal index. [[ `hostname` =~ -([0-9]+)$ ]] || exit 1 ordinal=${BASH_REMATCH[1]} echo [mysqld] > /mnt/conf.d/server-id.cnf # Add an offset to avoid reserved server-id=0 value. echo server-id=$((100 + $ordinal)) >> /mnt/conf.d/server-id.cnf # Copy appropriate conf.d files from config-map to emptyDir. if [[ $ordinal -eq 0 ]]; then cp /mnt/config-map/master.cnf /mnt/conf.d/ else cp /mnt/config-map/slave.cnf /mnt/conf.d/ fi
            volumeMounts:
            - name: conf
              mountPath: /mnt/conf.d
            - name: config-map
              mountPath: /mnt/config-map
          - name: clone-mysql57
            image: gcr.azk8s.cn/google-samples/xtrabackup:1.0
            command:
            - bash
            - "-c"
            - | set -ex # Skip the clone if data already exists. [[ -d /var/lib/mysql/mysql ]] && exit 0 # Skip the clone on master (ordinal index 0). [[ `hostname` =~ -([0-9]+)$ ]] || exit 1 ordinal=${BASH_REMATCH[1]} [[ $ordinal -eq 0 ]] && exit 0 # Clone data from previous peer. ncat --recv-only mysql57-$(($ordinal-1)).mysql57 3307 | xbstream -x -C /var/lib/mysql # Prepare the backup. xtrabackup --prepare --target-dir=/var/lib/mysql
            volumeMounts:
            - name: mysql57-data
              mountPath: /var/lib/mysql
              subPath: mysql
            - name: conf
              mountPath: /etc/mysql/conf.d
          containers:
          - name: mysql57
            image: 192.169.0.247:5000/dasp/mysql:5.7
            #command: ['/bin/bash','-c','docker-entrypoint.sh mysqld']
            env:
            - name: MYSQL_ALLOW_EMPTY_PASSWORD
              value: "1"
            ports:
            - name: mysql57
              containerPort: 3306
            - containerPort: 3306
              hostPort: 3306
              name: 3306tcp33060
              protocol: TCP
            volumeMounts:
            - name: mysql57-data
              mountPath: /var/lib/mysql
              subPath: mysql
            - name: conf
              mountPath: /etc/mysql/conf.d
            resources:
              requests:
                cpu: 500m
                memory: 1Gi
            livenessProbe:
              exec:
                command: ["mysqladmin", "ping"]
              initialDelaySeconds: 30
              periodSeconds: 10
              timeoutSeconds: 5
            readinessProbe:
              exec:
                # Check we can execute queries over TCP (skip-networking is off).
                command: ["mysql", "-h", "127.0.0.1", "-e", "SELECT 1"]
              initialDelaySeconds: 5
              periodSeconds: 2
              timeoutSeconds: 1
          - name: xtrabackup
            image: gcr.azk8s.cn/google-samples/xtrabackup:1.0
            ports:
            - name: xtrabackup
              containerPort: 3307
            command:
            - bash
            - "-c"
            - | set -ex cd /var/lib/mysql
    
              # Determine binlog position of cloned data, if any.
              if [[ -f xtrabackup_slave_info && "x$(<xtrabackup_slave_info)" != "x" ]]; then
                # XtraBackup already generated a partial "CHANGE MASTER TO" query
                # because we're cloning from an existing slave. (Need to remove the tailing semicolon!)
                cat xtrabackup_slave_info | sed -E 's/;$//g' > change_master_to.sql.in
                # Ignore xtrabackup_binlog_info in this case (it's useless).
                rm -f xtrabackup_slave_info xtrabackup_binlog_info
              elif [[ -f xtrabackup_binlog_info ]]; then
                # We're cloning directly from master. Parse binlog position.
                [[ `cat xtrabackup_binlog_info` =~ ^(.*?)[[:space:]]+(.*?)$ ]] || exit 1
                rm -f xtrabackup_binlog_info xtrabackup_slave_info
                echo "CHANGE MASTER TO MASTER_LOG_FILE='${ BASH_REMATCH[1]}',\
                      MASTER_LOG_POS=${ BASH_REMATCH[2]}" > change_master_to.sql.in
              fi
    
              # Check if we need to complete a clone by starting replication.
              if [[ -f change_master_to.sql.in ]]; then
                echo "Waiting for mysqld to be ready (accepting connections)"
                until mysql -h 127.0.0.1 -e "SELECT 1"; do sleep 1; done
    
                echo "Initializing replication from clone position"
                mysql -h 127.0.0.1 \
                      -e "$(<change_master_to.sql.in), \
                              MASTER_HOST='mysql57-0.mysql57', \
                              MASTER_USER='root', \
                              MASTER_PASSWORD='', \
                              MASTER_CONNECT_RETRY=10; \
                            START SLAVE;" || exit 1
                # In case of container restart, attempt this at-most-once.
                mv change_master_to.sql.in change_master_to.sql.orig
              fi
    
              # Start a server to send backups when requested by peers.
              exec ncat --listen --keep-open --send-only --max-conns=1 3307 -c \
                "xtrabackup --backup --slave-info --stream=xbstream --host=127.0.0.1 --user=root"
            volumeMounts:
            - name: mysql57-data
              mountPath: /var/lib/mysql
              subPath: mysql
            - name: conf
              mountPath: /etc/mysql/conf.d
            resources:
              requests:
                cpu: 100m
                memory: 100Mi
          volumes:
          - name: conf
            emptyDir: { }
          - name: config-map
            configMap:
              name: mysql57
      volumeClaimTemplates:
      - metadata:
          name: mysql57-data
        spec:
          accessModes: ["ReadWriteOnce"]
          storageClassName: "nfs-provisioner"
          resources:
            requests:
              storage: 10Gi

> `volumeClaimTemplates`: 要配置成自己的
> 
> `volumes`: 要配置成自己的

#### 4.检查是否完成 ####

kubectl get pods -l app=mysql57 --watch

>kubectl get pods -l app=mysql57 --watch
    NAME               READY   STATUS    RESTARTS   AGE
    mysql57-0   2/2     Running   0          89m
    mysql57-1   2/2     Running   0          90m
    mysql57-2   2/2     Running   0          91m

至此mysql集群主从复制就在rancher上面部署好了.

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