node1: 192.168.2.171 master1
node2: 192.168.2.172 slave
node3: 192.168.2.170 master2
node2上执行：
change master to
master_host='192.168.2.171',
master_user='rpl',
master_password='Abcd@1234',
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='Abcd@1234',
master_port=3306,
master_log_file='mysql-bin.000001',
master_log_pos=12 for channel 'master-2';
启动：
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 relay logs for channel 'master-1';
flush relay logs for channel 'master-2';
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