搭建mysql主从复制(主主复制)

1：设主库允许远程连接(注意：设置账号密码必须使用的插件是mysql_native_password，其他的会连接失败) #切换到mysql这个数据库，修改user表中的host，使其可以实现远程连接 mysql>use mysql; mysql>update user set host ="%" where user ="root"; #改完之后一定要刷新信息 mysql>flush privileges; 2：主库开启bin-log日志在my f的[mysqld]下添加 #修改主服务器Master #修改配置文件 vim /etc/my f #主服务器唯一ID，这个id可以随便修改，只要不跟从服务器重复,注意连接是-,不是_ server-id=1 #启用二进制日志 log-bin=mysql-bin 2-1：重启主库mysql [root@localhost ~]# systemctl retart mysql 2-2：查看主库server 相关信息 mysql> show global variables like '%server%'; +---------------------------------+--------------------------------------+ | Variable_name | Value | +---------------------------------+--------------------------------------+ | character_set_server | utf8mb4 | | collation_server | utf8mb4_0900_ai_ci | | innodb_dedicated_server | OFF | | innodb_ft_server_stopword_table | | | server_id | 1 | | server_id_bits | 32 | | server_uuid | b434ab49-df79-11ee-9c39-0242ac110002 | +---------------------------------+--------------------------------------+ 7 rows in set (0.00 sec) mysql> 2-2：查看主库是否开启bin-log日志 mysql> show global variables like '%log%';

2-3：查看主库的最新状态 mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000004 | 157 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec) mysql> FLUSH LOGS; Query OK, 0 rows affected (0.01 sec) mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000005 | 157 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec) mysql> 2-4：查看全部的二进制文件，可以选择一步一步恢复 mysql> SHOW BINARY LOGS; +------------------+-----------+-----------+ | Log_name | File_size | Encrypted | +------------------+-----------+-----------+ | mysql-bin.000001 | 204 | No | | mysql-bin.000002 | 204 | No | | mysql-bin.000003 | 204 | No | | mysql-bin.000004 | 204 | No | | mysql-bin.000005 | 157 | No | +------------------+-----------+-----------+ 5 rows in set (0.00 sec) mysql> 3：从库开启bin-log日志在my f的[mysqld]下添加 #修改从服务器slave 修改配置文件：vim /etc/my f #从服务器唯一ID,注意连接是-,不是_ server-id=2 #启用中继日志 relay-log=mysql-relay 3-1：查看主库是否开启bin-log日志，从库也是一样 mysql> show global variables like '%log%';

4：在主库创建一个账号slave，密码123456，并且授权连接 mysql>GRANT REPLICATION SLAVE ON *.* to 'slave'@'%' identified by '123456'; 4-1：在从库指定主库(添加 主节点主机，访问主节点的用户名及密码，主节点二进制文件信息，注意：主节点的二进制文件一定要是二进制列表中的最后一个二进制文件。如果需要设置主主就是主库也执行如下的命令，ip，账号，密码换成从库的) mysql> change master to master_host='192.168.11.47',master_user='root',master_password='root',master_log_file='mysql-bin.000005',master_log_pos=157; Query OK, 0 rows affected, 8 warnings (0.01 sec) 5：检查从库复制功能状态（注意：Slave_IO_Running，Slave_SQL_Running，两个线程必须为yes状态，否则主从复制搭建不成功） show slave status \G; 5-1：先停止从库的复制功能 mysql>stop slave; 5-2： 如果报错，异常原因，从库已经存在之前的relay log mysql> start slave; ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository 5-3：解决方案，使用reset slave语句，清除master信息和relay日志信息，并创建全新的中继日志. mysql> stop slave; Query OK, 0 rows affected, 2 warnings (0.00 sec) mysql> reset slave; Query OK, 0 rows affected, 1 warning (0.01 sec) mysql> change master to master_host='192.168.11.47',master_user='root',master_password='root',master_log_file='mysql-bin.000005',master_log_pos=157; Query OK, 0 rows affected, 8 warnings (0.02 sec) mysql> start slave; Query OK, 0 rows affected, 1 warning (0.01 sec) 5-4：再启动从库的复制功能 mysql>start slave; 5-5：再查看从库的状态 show slave status \G;

6：keepAlived的配置文件权限必须是644