mysqld_multi单机环境下启动多个 mysql_MySQL
1.单机启动多个mysql的好处
◆充分利用单机的计算能力
◆可以有效的分配不同的逻辑到不同的mysql提高数据库并行处理能力
◆单机也可以方便的实现主从备份
2.实例: 单机实现两个mysql运行,监听端口分别是3306,3307
实现方式
◆修改my.cnf: 把原来的[mysqld]=>[mysqld1],就实现了第一个默认的mysql参数的1数据库.然后添加一个新的mysql数据库,参数与mysql1类似如下:
以下是引用片段:
[mysqld2]
user = mysql
pid-file = /var/run/mysqld/mysqld2.pid
socket = /var/run/mysqld/mysqld2.sock
port = 3307
datadir = /var/lib/mysql2
bind-address = 127.0.0.1
log = /var/lib/mysql2/log.log
以上就是第二个数据库的配置。当然您可以按自己的要求修改
◆根据mysql2的配置添加相应的路径:因为datadir是用来存放数据库资料的文件夹路径。所以必须建一个相对应的文件夹(注意要让数据库对文件夹有写权限)。您可以先把mysql1的文件夹copy到新的路径下。然后修改文件权限:例如
cp /var/lib/mysql /var/lib/mysql2 -R
chown /var/lib/mysql2 mysql -R
◆使用mysqld_multi进行控制数据库的开启关闭。
mysqld_multi start 1,2 启动1,2两个数据库。
运行后,您可用ps aux|grep mysql 查看相关进程是否存在
mysqld_multi stop 1,2 关闭1,2数据库。
◆使用client查看不同的数据库
你可以用mysql -P3307 -uroot 根据不同的端口来进行访问,如果实验的时候行不通。你可以用
mysql -uroot -S/var/run/mysqld/mysql2.sock访问。
至此两个实例就介绍完了,假如您要运行多个数据库可以同样采用上面的方法。

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