mysql主从复制

Posted 2021-02-05 侯志清-江西南昌

1、模拟生产数据
create database prod;
create table test1(id int,name varchar(20));
insert into test1 values(1,‘user1‘);
insert into test1 values(2,‘user2‘);

2、备份主库
mysqldump -S /app/mysql/mysql.sock --single-transaction --master-data=2 --databases prod > /backup/hellodb_`date +%F`.sql

insert into test1 values(3,‘user3‘);

3、从库导入数据
mysql -S /app/mysql/mysql.sock < /root/hellodb_2018-08-20.sql 
查看导入的pos号，开启同步的时候需要用到
cat hellodb_2018-08-20.sql |grep MASTER_LOG_FILE
-- CHANGE MASTER TO MASTER_LOG_FILE=‘mysql-bin.000004‘, MASTER_LOG_POS=154;


4、在主库创建同步用户
CREATE USER ‘sync_user‘@‘192.168.0.99‘ IDENTIFIED BY ‘sync_user‘;
GRANT REPLICATION SLAVE ON *.* TO ‘sync_user‘@‘192.168.0.99‘;
flush privileges;

5、重启备库
删除/data/3306/auto.cnf
rm /data/3306/auto.cnf
mysqladmin -S /app/mysql/mysql.sock shutdown
bin/mysqld_safe --basedir = /app/mysql --datadir=/data/3306 --pid-file=/app/mysql/mysql.pid &


5、从库开启同步，同步pos号请看第3步骤
 CHANGE MASTER TO
         MASTER_HOST=‘192.168.0.98‘,
         MASTER_USER=‘sync_user‘,
         MASTER_PASSWORD=‘sync_user‘,
         MASTER_LOG_FILE=‘mysql-bin.000004‘,
         MASTER_LOG_POS=154;
         
start slave;
show slave statusG;     
            Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
上述输出表明同步成功。
            
6、数据对比
insert into test1 values(4,‘user4‘);

select * from prod.test1;