文章目录
确保从数据库与主数据库里的数据一样
在主数据库里创建一个同步账号授权给从数据库使用
注意：需要在最开始就完成账号的创建与授权，不能在备份完数据库之后在给账户权限
mysql> create user 'repl'@'192.168.220.10' identified by 'repl123!';
mysql> grant replication slave on *.* to 'repl'@'192.168.220.10';
mysql> flush privileges;
配置主数据库
[root@localhost ~]# vim /etc/my.cnf
[root@localhost ~]# cat /etc/my.cnf
[mysqld]
basedir = /usr/local/mysql
datadir = /opt/data
socket = /tmp/mysql.sock
port = 3306
pid-file = /opt/data/mysql.pid
user = mysql
skip-name-resolve
log-bin = mysql_bin
server-id = 10
[root@localhost ~]# service mysqld restart
Shutting down MySQL.. SUCCESS!
Starting MySQL.. SUCCESS!
查看库的状态
mysql> show master status\G
*************************** 1. row ***************************
File: mysql_bin.000001
Position: 154
Binlog_Do_DB:
Binlog_Ignore_DB:
Executed_Gtid_Set:
配置从数据库
[root@localhost ~]# vim /etc/my.cnf
[root@localhost ~]# cat /etc/my.cnf
[mysqld]
basedir = /usr/local/mysql
datadir = /opt/data
socket = /tmp/mysql.sock
port = 3306
pid-file = /opt/data/mysql.pid
user = mysql
skip-name-resolve
relay-log = mysql_relay
server-id = 20
[root@localhost ~]# service mysqld restart
mysql> change master to
-> master_host='192.168.220.20',
-> master_user='repl',
-> master_password='repl123!',
-> master_log_file='mysql_bin.000001',
-> master_log_pos=154;
mysql> start slave;
两项必须为yes
mysql> show slave status \G
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
主从同步
锁主库
mysql> flush tables with read lock;
mysql> insert student value(4,'sfdgs',23);
ERROR 1223 (HY000): Can't execute the query because you have a conflicting read lock
备份主库并将备份文件传送到从库
[root@localhost ~]# mysqldump -uroot -p123456 --all-databases > alldatabases.sql
[root@localhost ~]# scp alldatabases.sql root@192.168.220.30:/root/
在从库上恢复主库的备份并查看从库有哪些库，确保与主库一致
[root@localhost ~]# mysql -uroot -p123456 < alldatabases.sql
解除主锁
推出mysql即可解锁
查看状态
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql_bin.000001 | 1578 | | | |
+------------------+----------+--------------+------------------+-------------------+
从库操作跟之前一样
查看数据库当前的进程
mysql> show processlist\G
*************************** 1. row ***************************
Id: 8
User: root
Host: localhost
db: NULL
Command: Query
Time: 0
State: starting
Info: show processlist
1 row in set (0.01 sec)
来源：CSDN
作者：您懂linux马
链接：https://blog.csdn.net/hzw199788/article/details/103694936