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mysql主从复制原则

2024-07-24 12:34:33
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  环境:
 
  3306 主库
 
  3307 从库
 
  1 设置server-id值并开启binlog功能参数
 
  编辑mysql的配置文件/data/3306/my.cnf
 
  [mysqld]
 
  server-id = 6              ----用于同步的每台机器或实例sever-id都不能相同
 
  log_bin =/data/3306/mysql-bin  ----可以省略
 
  重启服务
 
  /data/3306/mysql restart
 
  检查思路一
 
  [root@db02 data]# egrep "log_bin|server-id" 330*/my.cnf
 
  3306/my.cnf:log_bin = /data/3306/mysql-bin
 
  3306/my.cnf:server-id = 6
 
  3307/my.cnf:server-id = 7
 
  检查思路二:
 
  检查思路2:
 
  登录:
 
  [root@db02 data]# mysql -S /data/3306/mysql.sock
 
  查看变量:
 
  mysql> show variables like 'log_bin%';
 
  +---------------------------------+----------------------------+
 
  | Variable_name                   | Value                      |
 
  +---------------------------------+----------------------------+
 
  | log_bin                         | ON                         |
 
  | log_bin_basename                | /data/3306/mysql-bin       |
 
  | log_bin_index                   | /data/3306/mysql-bin.index |
 
  | log_bin_trust_function_creators | OFF                        |
 
  | log_bin_use_v1_row_events       | OFF                        |
 
  +---------------------------------+----------------------------+
 
  5 rows in set (0.00 sec)
 
  2 建账号授权【主库】
 
  grant replication slave on *.* to 'rep'@'172.16.1.%' identified by 'oldboy123';
 
  flush privileges;
 
  3锁表导出数据
 
  mysql> flush table with read lock;
 
  Query OK, 0 rows affected (0.00 sec)
 
  查看位置:
 
  mysql> show master status;
 
  +------------------+----------+--------------+------------------+-------------------+
 
  | File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
 
  +------------------+----------+--------------+------------------+-------------------+
 
  | mysql-bin.000001 |      405 |              |                  |                   |
 
  +------------------+----------+--------------+------------------+-------------------+
 
  1 row in set (0.00 sec)
 
  新开窗口备份:
 
  mysqldump -uroot -p'oldboy123' -S /data/3306/mysql.sock -A -B |gzip >/server/backup/mysql_bak.$(date +%F).sql.gz
 
  原窗口解锁:
 
  mysql> show master status;
 
  +------------------+----------+--------------+------------------+-------------------+
 
  | File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
 
  +------------------+----------+--------------+------------------+-------------------+
 
  | mysql-bin.000001 |      405 |              |                  |                   |
 
  +------------------+----------+--------------+------------------+-------------------+
 
  1 row in set (0.00 sec)
 
  mysql> unlock tables;
 
  Query OK, 0 rows affected (0.01 sec)
 
  如下命令可替代3的所有步骤
 
  mysqldump -uroot -p'oldboy123' --master-data=2 -S /data/3306/mysql.sock -A -B
 
  4、将数据导入到从库
 
  [root@db02 backup]# mysql -S /data/3307/mysql.sock <mysql_bak.2017-05-04.sql
 
  5、让从库从主库锁表时刻记录的binlog位置点开始向下同步
 
  CHANGE MASTER TO  
 
  MASTER_HOST='172.16.1.52',
 
  MASTER_PORT=3306,
 
  MASTER_USER='rep',
 
  MASTER_PASSWORD='oldboy123',
 
  MASTER_LOG_FILE='mysql-bin.000001',
 
  MASTER_LOG_POS=405;

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