在同一台机器上运行多个 MySQL 服务器

Mysql中的mysqld_multi命令，可用于在一台物理服务器运行多个Mysql服务

一、准备工作

1.MySQL源码安装

[root@localhost ~]# tar zxvf mysql-5.0.80.tar.gz        
[root@localhost ~]# cd mysql-5.0.80    
[root@localhost mysql-5.0.80]# ./configure --prefix=/usr/local/mysql    
[root@localhost mysql-5.0.80]# make    
[root@localhost mysql-5.0.80]# make install

2.建立帐户

[root@localhost mysql-5.0.80]# adduser mysql
[root@localhost mysql-5.0.80]# chown -R mysql:root /usr/local/mysql

3.初始化授权表

[root@localhost mysql]# su mysql
[root@localhost mysql]# cd /usr/local/mysql
[root@localhost mysql]# ./bin/mysql_install_db

二、多个MySQL服务

创建my.cnf　

[root@localhost mysql]# touch /etc/my.cnf
[root@localhost mysql]#vi /etc/my.cnf

my.cnf的内容如下

[mysqld_multi]
mysqld=/usr/local/mysql/bin/mysqld_safe
mysqladmin=/usr/local/mysql/bin/mysqladmin
user = mysql
password = d3.zone
[mysqld1]
port = 3306
socket = /tmp/mysql.sock1
pid-file=/usr/local/mysql/var1/db-app1.pid
log=/usr/local/mysql/var1/db-app.log
datadir = /usr/local/mysql/var1
user = mysql
[mysqld2]
port = 3307
socket = /tmp/mysql.sock2
pid-file = /usr/local/mysql/var2/db-app2.pid
datadir = /usr/local/mysql/var2
log=/usr/local/local/var2/db-app.log
user = mysql
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout

配置中不同mysql 服务建立各自文件夹和初始数据库等

[root@localhost mysql]# cd /usr/local/mysql
[root@localhost mysql]# mv var ./var1
[root@localhost mysql]# cp var1 ./var2 -R

现在，可以通过mysqld_multi的参数来启动mysqld_multi

[root@localhost mysql]#    /usr/local/mysql/bin/mysqld_multi --config-file=/etc/my.cnf start 1-2　

用report参数查看运行状态

 

至此，我们的两个mysql服务就启动了，可以根据需要添加更多的mysql服务，这里我就不在��嗦了。

在客户端访问通过mysqld_multi启动的mysql服务时，需要指定相应的mysql服务端口

在服务器本机上，还可以通过mysql的socket来指定相应mysql服务

[root@localhost mysql]# mysql --socket=/tmp/mysql.sock1 -uroot -p