MySQL5.7的多源复制
MySQL5.7多源复制的实验环境：
node1:192.168.2.171主库1
node3:192.168.2.170主库2
node2:192.168.2.172归档用的从库
1、node2上需要配置复制过滤掉mysql库：
replicate_wild_ignore_table=mysql.%
replicate_wild_ignore_table=test.%
### 5.7上可以直接使用 stop slave; CHANGE REPLICATION FILTER REPLICATE_WILD_IGNORE_TABLE = ('mysql.%','test.%');start salve;动态修改复制过滤库。
2、先将node1、node3上的备份mysqldump -uxx -pxx -q --single-transaction --master-data=2 导入到node2上。
3、在node2上配置主从复制
node2上执行：
change master to
master_host='192.168.2.171',
master_user='rpl',
master_password='rpl',
master_port=3306,
master_log_file='mysql-bin.000001',
master_log_pos=4 for channel 'master-1';
change master to
master_host='192.168.2.170',
master_user='rpl',
master_password='rpl',
master_port=3306,
master_log_file='mysql-bin.000001',
master_log_pos=12 for channel 'master-2';
启动复制：
start slave for channel 'master-1';
start slave for channel 'master-2';
查看状态：
show slave status for channel 'master-1'\G
show slave status for channel 'master-2'\G
停止：
stop slave for channel 'master-1';
stop slave for channel 'master-2';
清空同步信息和日志：
reset slave for channel 'master-1';
reset slave for channel 'master-2';
刷下relaylog：
flush>
flush>
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