CHANGE MASTER TO
MASTER_HOST='10.10.30.34',
MASTER_PORT=3306,
MASTER_USER='slave',
MASTER_PASSWORD='slave',
MASTER_LOG_FILE='MySQL-bin.000148',
MASTER_LOG_POS=154;
从数据库变为主库
stop slave;
reset slave;
reset master;
从库变为刚才的主库（由从库变为主库的数据库）
vim /etc/my.cnf
log-bin=mysql-bin #并重启数据库，主库开启binlog日志
主库操作:show master status
主库操作:scp -r /var/lib/mysql/* 10.10.50.34:/var/lib/mysql/
从库:chown -R mysql.mysql /var/lib/mysql/
从库:systemctl restart mysqld
CHANGE MASTER TO
MASTER_HOST='172.16.1.51',
MASTER_PORT=3306,
MASTER_USER='rep',
MASTER_PASSWORD='123456',
MASTER_LOG_FILE='mysql-bin.000001',
MASTER_LOG_POS=335;
进入数据:start slave;
中间报错：
1.IO进程一直处于connnecting中
slave 用户的密码写错
2.show slave status;报错
Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file name in binary log index file'
解决办法：
主库：flush logs；
从库：
stop slave；
CHANGE MASTER TO MASTER_LOG_FILE='mysqld-bin.000011',MASTER_LOG_POS=106;
start slave；
当前题目：mysql5.7迁移以及从库提升为主库
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