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利用docker制作mysql8.0 1主3从

作者站长头像
站长
· 阅读数 24

拉取镜像

docker pull mysql:8.0.23

启动容器(master)

docker run -d -p 3340:3306  --restart always --name mysql-master -e MYSQL_ROOT_PASSWORD=123456 -v /data/mysql-master/conf:/etc/mysql -v /data/mysql-master/data:/var/lib/mysql -v /data/mysql-master/log:/var/log/mysql -v /data/mysql-master/mysql-files:/var/lib/mysql-files mysql:8.0.23

启动容器(slave)

docker run -d -p 3341:3306 --restart always --name mysql-slave1 -e MYSQL_ROOT_PASSWORD=123456 -v /data/mysql-slave1/conf:/etc/mysql -v /data/mysql-slave1/data:/var/lib/mysql -v /data/mysql-slave1/log:/var/log/mysql -v /data/mysql-slave1/mysql-files:/var/lib/mysql-files mysql:8.0.23

docker run -d -p 3342:3306 --restart always --name mysql-slave2 -e MYSQL_ROOT_PASSWORD=123456 -v /data/mysql-slave2/conf:/etc/mysql -v /data/mysql-slave2/data:/var/lib/mysql -v /data/mysql-slave2/log:/var/log/mysql -v /data/mysql-slave2/mysql-files:/var/lib/mysql-files mysql:8.0.23

docker run -d -p 3343:3306 --restart always --name mysql-slave3 -e MYSQL_ROOT_PASSWORD=123456 -v /data/mysql-slave3/conf:/etc/mysql -v /data/mysql-slave3/data:/var/lib/mysql -v /data/mysql-slave3/log:/var/log/mysql -v /data/mysql-slave3/mysql-files:/var/lib/mysql-files mysql:8.0.23

配置Master(主)

1.进入mysql-master容器

docker exec -it mysql-master bash

1.1.进入/etc/mysql目录;配置my.cnf配置文件;

注意:vi my.cnf(这条命令在docker里面会报一个错误:bash: vi: command not found) 解决办法就是:就是更新本地vim,从新安装一下vim;分别执行以下命令

apt-get update
apt-get install vim

1.2.开始配置my.cnf文件

[mysqld]
## 同一局域网内注意要唯一
server-id=1
## 开启二进制日志功能
log-bin=mysql-bin

1.3进入mysql

mysql -uroot -p 123456

# 在主节点创建slave账号;密码为:123456
CREATE USER 'slave'@'%' IDENTIFIED BY '123456';

# 给账号slave赋予权限
GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'slave'@'%';

# 修改mysql密码认证方式;8.0以前的加密方式mysql_native_password;8.0之后的加密方式:caching_sha2_password
ALTER USER 'slave'@'%' IDENTIFIED WITH mysql_native_password BY '123456';

2 重启主节点容器

docker restart mysql-master

配置Slave(从)

1. 进入slave从节点容器

docker exec -it mysql-slave1 bash

1.1.进入/etc/mysql目录;配置my.cnf配置文件;

注意:vi my.cnf(这条命令在docker里面会报一个错误:bash: vi: command not found) 解决办法就是:就是更新本地vim,从新安装一下vim;分别执行以下命令

apt-get update
apt-get install vim

1.2.开始配置my.cnf文件

[mysqld]
## 同一局域网内注意要唯一
server-id=2
## 开启二进制日志功能
log-bin=mysql-bin

1.3进入mysql

# 在主节点创建slave账号;密码为:123456
CREATE USER 'slave'@'%' IDENTIFIED BY '123456';

# 给账号slave赋予权限
GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'slave'@'%';

# 修改mysql密码认证方式;8.0以前的加密方式mysql_native_password;8.0之后的加密方式:caching_sha2_password
ALTER USER 'slave'@'%' IDENTIFIED WITH mysql_native_password BY '123456';

2.重启从节点容器

docker restart mysql-slave

配置主从同步

1.进入主节点容器,进入mysql数据库,执行如下命令

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 |      1011|              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

注意:File和Position字段的值后面将会用到,在后面的操作完成之前,需要保证Master库不能做任何操作,否则将会引起状态变化,File和Position字段的值变化

2.进入从节点容器,进入mysql数据库,执行如下命名

change master to master_host='172.17.0.4', master_user='slave', master_password='123456', master_port=3306, master_log_file='mysql-bin.000001', master_log_pos= 1011, master_connect_retry=30;

2.1命令参数说明

master_host :Master的地址,指的是容器的独立ip,可以通过docker inspect --format='{{.NetworkSettings.IPAddress}}' mysql-master
master_port:Master的端口号,指的是容器的端口号
master_user:用于数据同步的用户
master_password:用于同步的用户的密码
master_log_file:指定 Slave 从哪个日志文件开始复制数据,即上文中提到的 File 字段的值
master_log_pos:从哪个 Position 开始读,即上文中提到的 Position 字段的值
master_connect_retry:如果连接失败,重试的时间间隔,单位是秒,默认是60秒
在Slave 中的mysql终端执行show slave status \G;用于查看主从同步状态。

2.2 开始启动同步

start slave;

2.3 查看slave节点状态

mysql> show slave status \G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.17.0.4
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 30
              Master_Log_File: mysql-bin.000001
          Read_Master_Log_Pos: 146913
               Relay_Log_File: edu-mysql-relay-bin.000004
                Relay_Log_Pos: 146226
        Relay_Master_Log_File: mysql-bin.000001
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 0
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 146913
              Relay_Log_Space: 146607
              Until_Condition: None
               Until_Log_File: 
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File: 
           Master_SSL_CA_Path: 
              Master_SSL_Cert: 
            Master_SSL_Cipher: 
               Master_SSL_Key: 
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error: 
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 100
                  Master_UUID: 280f389e-2154-11ee-ba18-0242ac110004
             Master_Info_File: mysql.slave_master_info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 
                Auto_Position: 0
         Replicate_Rewrite_DB: 
                 Channel_Name: 
           Master_TLS_Version: 
       Master_public_key_path: 
        Get_master_public_key: 0
            Network_Namespace: 
1 row in set, 1 warning (0.01 sec)

ERROR: 
No query specified

2.3 节点同步成功标识

Slave_IO_Running: Yes
Slave_SQL_Running: Yes

说明:节点slave2和节点slave3 操作步骤都和节点slave1一样,唯一不同就是my.cnf里面的server-id=2的值更改就行

转载自:https://juejin.cn/post/7255334045077078071
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