mysql多实例配置

在实际的开发过程中，可能会需要在一台服务器上部署多个MYSQL实例，那建议使用MYSQL官方的解决方案 mysqld_multi

1.修改my.cnf

如一个定义两个实例的参考配置：

[mysqld_multi] 
mysqld = /usr/local/mysql/bin/mysqld_safe 
mysqladmin = /usr/local/mysql/bin/mysqladmin 
user = your_user 
password = your_password 
[mysqld1] 
datadir = /data/db/my1 
#连接 
port = 3306 
socket = /tmp/mysql3306.sock 
#binlog 
log-bin=/data/db/mylog1/mysql-bin 
binlog_format=mixed 
binlog_cache_size = 32M 
expire_logs_days = 30 
[mysqld2] 
datadir = /data/db/my2 
#连接 
port = 3307 
socket = /tmp/mysql3307.sock 
#binlog 
log-bin=/data/db/mylog2/mysql-bin 
binlog_format=mixed 
binlog_cache_size = 32M 
expire_logs_days = 3 

 

2.创建数据目录

mkdir -p /data/db/my21 
mkdir -p /data/db/my2 
chown mysql.mysql /data/db/my1 -R 
chown mysql.mysql /data/db/my2 -R 

3.初始化DB

/usr/local/mysql/scripts/mysql_install_db --datadir=/data/db/my1/ -uroot (mysql_install_db也是MYSQL官方自带工具) 
/usr/local/mysql/scripts/mysql_install_db --datadir=/data/db/my2/ -uroot 
chown mysql.mysql /data/db/my1/ -R 
chown mysql.mysql /data/db/my2/ -R 

4. 安装工具

cp /usr/local/mysql/bin/my_print_defaults /usr/bin/ 
cp /usr/local/mysql/bin/mysqld_multi /usr/bin/ 

5.创建、授权用户

CREATE USER "your_user"@"192.168.45.127%" IDENTIFIED BY 'your_password'; 
GRANT ALL PRIVILEGES ON *.* TO "your_user"@"192.168.1.%"; 
flush privileges; 

 

至此，mysql多实例配置已经完毕。我们看到多个不同的MYSQL实例是共用my.cnf的。多实例命令行管理：

1.mysql启动

mysqld_multi start 1 启动实例1 
mysqld_multi start 1-2 启动实例1,2

2.mysql重启

mysqld_multi restart 1 重启实例1 
mysqld_multi restart 1-2 重启实例1,2 

3.mysql关闭

mysqld_multi stop 1 关闭实例1 
mysqld_multi stop 1-2 关闭实例1,2 

4.命令行登陆实例2

mysql -u your_user -p your_password -P3307 -S /tmp/mysql3307.sock