• 主1
 vi /etc/my.cnf
 ======================================================================
 server-id=1 #主机ID(根据需求自行设置)
 log-bin=mysql-bin # 启用二进制日志
 auto-increment-increment = 2 #每次增长2
 auto-increment-offset = 1 #设置自动增长的字段的偏移量
 #两个可选参数(2选1):
 binlog-do-db=test1 #需要同步的库
 binlog-ignore-db=mysql,information_schema,performation_schema,sys #忽略不同步的库
 ======================================================================
 重启mysql服务
 /etc/init.d/mysqld restart
 ======================================================================
 登录mysql
 mysql -uroot -p
 grant replication slave on *.* to 用户名@'主2IP' identified by '密码';
 flush privileges;
 show master status;(或show master status \G)#记录下二进制日志文件名和位置
进入主2进行操作
 ======================================================================
主2设置成功后
 stop slave;
 change master to master_host='主2IP',master_user='用户名',master_password='密码',master_log_file='mysql-bin.000001',master_log_pos=613;
 (master_log_file和master_log_pos填上刚才记录下主1的二进制日志文件名和位置)
 start slave;
 show slave status\G(出现Slave_IO_Running: Yes Slave_SQL_Running: Yes 标识主1设置成功,即可测试主主复制)
 ======================================================================
 主主复制配置成功,
 注:主1和主2库要保持一致,主1备份还原到主2• 主2
 vi /etc/my.cnf
 ======================================================================
 server-id=2 #主机ID(根据需求自行设置)
 log-bin=mysql-bin # 启用二进制日志
 auto-increment-increment = 2 #每次增长2
 auto-increment-offset = 1 #设置自动增长的字段的偏移量
 #两个可选参数(2选1):
 binlog-do-db=test1 #需要同步的库
 binlog-ignore-db=mysql,information_schema,performation_schema,sys #忽略不同步的库
 ======================================================================
 重启mysql服务
 /etc/init.d/mysqld restart
 ======================================================================
 登录mysql
 mysql -uroot -p
 grant replication slave on *.* to 用户名@'主1IP' identified by '密码';
 flush privileges;
 show master status;(或show master status \G)#记录下二进制日志文件名和位置
 stop slave;
 change master to master_host='主1IP',master_user='用户名',master_password='密码',master_log_file='mysql-bin.000001',master_log_pos=613;
 (master_log_file和master_log_pos填上刚才记录下主1的二进制日志文件名和位置)
 start slave;
 show slave status\G(出现Slave_IO_Running: Yes Slave_SQL_Running: Yes 标识主2设置成功)
返回主1进行操作
 ======================================================================• 一从
 vi /etc/my.cnf
 ======================================================================
 [mysqld]
 #追加以下内容
 lower_case_table_names = 1 # 表名不区分大小写
 server-id = 134
 master_info_repository = table
 relay_log_info_repository = table
 ======================================================================
 重启mysql服务
 /etc/init.d/mysqld restart
 ======================================================================
 mysql -uroot -p

 CHANGE MASTER TO
 MASTER_HOST='主1IP',
 MASTER_PORT=3306, MASTER_USER='用户',
 MASTER_PASSWORD='密码',
 MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=886 for channel '主1标识';
 (master_log_file和master_log_pos填上刚才记录下主1的二进制日志文件名和位置)

 CHANGE MASTER TO
 MASTER_HOST='主2IP',
 MASTER_PORT=3306, MASTER_USER='用户',
 MASTER_PASSWORD='密码',
 MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=154 for channel '主2标识';
 (master_log_file和master_log_pos填上刚才记录下主2的二进制日志文件名和位置)

 flush privileges;
 start slave;
 show slave status\G(出现Slave_IO_Running: Yes Slave_SQL_Running: Yes 标识主2设置成功)• 测试
 进入随意主库,创建表,插入一条数据
 CREATE TABLE `t_user` (
 `id` varchar(32) NOT NULL COMMENT '主键ID',
 `name` varchar(32) CHARACTER SET utf8mb4 NULL COMMENT '用户名称',
 `code` varchar(32) CHARACTER SET utf8mb4 NULL COMMENT '用户编码',
 `phone_number` varchar(300) CHARACTER SET utf8mb4 NULL COMMENT '电话号码',
 `create_date` datetime NULL COMMENT '创建时间',
 `update_date` datetime NULL COMMENT '修改时间',
 PRIMARY KEY (`id`)
 ) COMMENT = '用户信息表';
 INSERT INTO t_user (`id`, `name`, `code`, `phone_number`, `create_date`, `update_date`)
 VALUES ('userId_4', '张三', '123456789', '123456789632', '2020-04-27 22:05:00', '2020-04-27 22:05:00');

 从库查询,发现数据保持一致,表示主从复制成功
 另一主库查询,发现数据保持一致,表示主主复制成功
 以上都成功,表示两主一从搭建成功(使用方式可以选择两主中的一主对外进行写入,另外一主进行查询,一从作为备份)