MYSQL使用经验(八)-在线主从复制集群的配置与恢复及主主配置
MYSQL使用心得(八)----在线主从复制集群的配置与恢复及主主配置 在线执行主从配置 FLUSH TABLES WITH READ LOCK; UNLOCK TABLES; 在从库数据文件夹下，有个master.info文件，是从机器上特有的。 重置从库：用于让从属服务器忘记其在主服务器的二进制日志中的
MYSQL使用心得(八)----在线主从复制集群的配置与恢复及主主配置在线执行主从配置
FLUSH TABLES WITH READ LOCK;
UNLOCK TABLES;
在从库数据文件夹下，有个master.info文件，是从机器上特有的。
重置从库：用于让从属服务器忘记其在主服务器的二进制日志中的复制位置, 它会删除master.info和relay-log.info文件，以及所有的中继日志，并启动一个新的中继日志,当你不需要主从的时候可以在从上执行这个操作。
reset slave;
重新配置主库（删除binlog）
reset master;
查看复制日志
show binlog events in 'mysql-bin.000004' \G;
主主配置
需要注意配置
[mysqld]
# 步进值
auto_increment_increment=2
# 起始偏移量
auto_increment_offset=1
# 使从服务器把复制的事件记录到自己的二进制日志中
log_slave_updates=1
自动删除binlog
设置自动清理MySQL binlog日志，配置my.cnf：
expire_logs_days = 10
在线进行主从恢复
1）首先要锁主库的表
FLUSH TABLES WITH READ LOCK;
2）然后复制主库的物理文件到从库上，保持数据文件一致。（建议使用mysqldump，可以保证数据的一致性）
3）记录下主库的
master_log_file
master_log_pos
4）解锁主库的表，此时虽然从库没有完成配置，但是写入数据也没有关系，我们已经记录下了bin-log的偏移位置。
UNLOCK TABLES;
5）从库新配置主从
附加阅读
在从库数据文件夹下，有个master.info文件，是从机器上特有的。
重置从库：用于让从属服务器忘记其在主服务器的二进制日志中的复制位置, 它会删除master.info和relay-log.info文件，以及所有的中继日志，并启动一个新的中继日志,当你不需要主从的时候可以在从上执行这个操作。
RESET SLAVE;
在线进行主主复制恢复
同上，锁表，拷贝相同的物理文件（建议使用mysqldump，可以保证数据的一致性），同时记录下2
master_log_file
master_log_pos
然后解锁
配置主从同步
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