[MySQL] MySQL配置主从服务器(一主多从)

当前环境
centos 7.6
mysql 5.7

vim /etc/my.cnf

在 [mysqld] 后面换行追加配置，保存并退出

server-id=1
log-bin=master-bin
log-bin-index=master-bin.index

systemctl restart  mysqld.service
 
# 查看状态
systemctl status mysqld.service

mysql -u root -p
show master status;

vim /etc/my.cnf

在 [mysqld] 后面换行追加配置，保存并退出

server-id=2
relay-log=slave-01-relay-bin
relay-log-index=slave-01-relay-bin.index

systemctl restart  mysqld.service
# 查看状态
systemctl status mysqld.service

vim /etc/my.cnf

在 [mysqld] 后面换行追加配置，保存并退出

server-id=3
relay-log=slave-02-relay-bin
relay-log-index=slave-02-relay-bin.index

systemctl restart  mysqld.service
# 查看状态
systemctl status mysqld.service

登录主机mysql控制台，创建用户，授权并刷新。

mysql -u root -p
 
create user 'repl'@'%' identified by 'mysql57*';
grant replication slave on *.* to 'repl'@'%' identified by 'mysql57*';
flush privileges;

mysql -u root -p
 
# 这里我的主机ip是192.168.1.8
change master to master_host='192.168.1.8',master_port=3306,master_user='repl',master_password='mysql57*',master_log_file='master-bin.000001',master_log_pos=0;
 
start slave;
#停止主从同步
#stop slave;
# \g 表示换行查看
show slave status \g;

若查看主从状态提示the slave i/o thread stops because master and slave have equal mysql server uuids; these uuids must be different for replication to work.请参考常见问题

the slave i/o thread stops because master and slave have equal mysql server uuids; these uuids must be different for replication to work.

找到mysql的uuid，修改一个字符，重启服务，然后登陆mysql控制台，开启主从

find / -name 'auto.cnf'
vim /var/lib/mysql/auto.cnf
systemctl restart  mysqld.service
mysql -u root -p
start slave;
# \g 表示换行查看
show slave status \g;