mysql主从复制安装详解

1、环境准备：两台Linux6.8服务器，（可以通过yum安装mysql：yum install mysql mysql-server -y，
安装的版本可能比较低，对于练手来说够用了 ）
主库ip：192.168.0.2，从库ip：192.168.0.3

2、主库操作
[root@localhost ~]# vim /etc/my.cnf
[mysqld] #在mysqld下增加server-id和log-bin日志目录
server-id = 1 #主server-id为1，不能重复
log-bin=/var/lib/mysql/mysql-bin #log-bin目录

[root@localhost ~]# service mysqld restart # 重启服务

mysql> show variables like 'log_bin'; # 查看是否打开 binlog 日志
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_bin | ON |
+---------------+-------+

mysql> grant replication slave on *.* to 'rep'@'192.168.0.%' identified by 'rep'; # 建立从库复制账号密码 rep/rep
mysql> flush privileges;
mysql> show master status; # 主库当前日志文件和当前偏移量，下面会用到这两个值
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000001 | 100 | | |
+------------------+----------+--------------+------------------+

3、从库操作
[root@localhost ~]# vim /etc/my.cnf
server-id = 2 #只添加server-id即可

[root@localhost ~]# service mysqld restart # 重启数据库

#执行下面命令，将相关复制信息导入从库
mysql << EOF
CHANGE MASTER TO
MASTER_HOST='192.168.0.2', # 主库 IP
MASTER_PORT=3306, # 主库端口
MASTER_USER='rep', # 复制用户
MASTER_PASSWORD='rep', # 用户密码
MASTER_LOG_FILE='mysql-bin.000001', # 上面看到的日志文件名
MASTER_LOG_POS=100; # 上面看到的日志偏移量
EOF

[root@localhost ~]# mysql -e "start slave"; # 启动主从复制
[root@localhost ~]# mysql -e "show slave status"; # 查看主从复制是否成功

4、测试
[root@localhost ~]# mysql -e "create database rep"; #主库执行
[root@localhost ~]# mysql -e "show databases like 'rep'"; #从库执行
+----------------+
| Database (rep) |
+----------------+
| rep |
+----------------+