master：server-id：3
slave：server-id：4
master开启binlog
#master授权：
grant replication slave on *.* to 'rep'@'192.168.1.%' identified by 'xxxxx';
1、主库备份时（定时任务）：
mysqldump -uroot -p -A --events -B -x --master-data=1|gzip >/opt/$(date +%F).sql.gz
2、从库上（白天搞即可）：
gzip -d 2019-11-27.sql.gz
mysql -uroot -p <2019-11-27.sql
3、查看2019-11-27.sql
第一条是这个：CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=657262842;
4、登录slave的数据库
CHANGE MASTER TO
MASTER_HOST='192.168.1.55',
MASTER_PORT=3306,
MASTER_USER='rep',
MASTER_PASSWORD='xxxxx',
MASTER_LOG_FILE='mysql-bin.000001',
MASTER_LOG_POS=657262842;
start slave;
show slave statusG