mysqld_multi 可以管理多个帧听不同Unix套接字文件和TCP/IP端口的连接的mysqld 进程。它可以启动或停止服务器，或报告它们的当前状态。
第一步：手动编写这个多启动配置文件
# vim /usr/local/mysql/etc/mysqld_multi.cnf
[mysqld_multi] --多启动的参数组，不要写错
mysqld=/usr/local/mysql/bin/mysqld_safe --启动时使用的程序
mysqladmin=/usr/local/mysql/bin/mysqladmin --管理程序
user=multi_admin --定义管理用户名
password=multipass --管理用户的密码
[mysqld00]
port=3300
datadir=/data00
pid-file=/var/run/mysqld/mysql00.pid
socket=/var/run/mysqld/mysql00.socket
general_log
general_log_file=/var/log/mysqld/mysql00.log
log-error=/var/log/mysqld/mysql00-err.log
[mysqld01]
port=3301
datadir=/data01
pid-file=/var/run/mysqld/mysql01.pid
socket=/var/run/mysqld/mysql01.socket
general_log
general_log_file=/var/log/mysqld/mysql01.log
log-error=/var/log/mysqld/mysql01-err.log
[mysqld02]
port=3302
datadir=/data02
pid-file=/var/run/mysqld/mysql02.pid
socket=/var/run/mysqld/mysql02.socket
general_log
general_log_file=/var/log/mysqld/mysql02.log
log-error=/var/log/mysqld/mysql02-err.log
第二步：
创建目录，并修改其权限
# mkdir /data00 /data01 /data02 /var/run/mysqld /var/log/mysqld
# chown mysql.mysql /data00 /data01 /data02 /var/run/mysqld /var/log/mysqld /usr/local/mysql/etc/mysqld_multi.cnf
第三步：
初始化要管理的多个数据库
# /usr/local/mysql/bin/mysql_install_db --datadir=/data00/ --user=mysql
# /usr/local/mysql/bin/mysql_install_db --datadir=/data01/ --user=mysql
# /usr/local/mysql/bin/mysql_install_db --datadir=/data02/ --user=mysql
第四步，用mysqld_multi启动多个数据库
# /usr/local/mysql/bin/mysqld_multi --config-file=/usr/local/mysql/etc/mysqld_multi.cnf start 0,1,2
也可以使用下面的命令来启动；--config-file参数将会被--defaults-extra-file参数替代
[root@li ~]# /usr/local/mysql/bin/mysqld_multi --defaults-extra-file=/usr/local/mysql/etc/mysqld_multi.cnf start 0,1,2
# netstat -ntlup |grep 33
tcp 0 0 0.0.0.0:3300 0.0.0.0:* LISTEN 3855/mysqld
tcp 0 0 0.0.0.0:3301 0.0.0.0:* LISTEN 3494/mysqld
tcp 0 0 0.0.0.0:3302 0.0.0.0:* LISTEN 3507/mysqld
报告数据库状态用report
# /usr/local/mysql/bin/mysqld_multi --config-file=/usr/local/mysql/etc/mysqld_multi.cnf report 0,1,2
Reporting MySQL servers
MySQL server from group: mysqld00 is running
MySQL server from group: mysqld01 is running
MySQL server from group: mysqld02 is running
分别使用这多个数据的方法：
就是使用mysql连接时，指定不同的socket
# /usr/local/mysql/bin/mysql --socket=/var/run/mysqld/mysql00.socket
# /usr/local/mysql/bin/mysql --socket=/var/run/mysqld/mysql01.socket
# /usr/local/mysql/bin/mysql --socket=/var/run/mysqld/mysql02.socket
第五步：
授权关闭数据的权限
# /usr/local/mysql/bin/mysqld_multi --config-file=/usr/local/mysql/etc/mysqld_multi.cnf stop 0,1,2
--使用上面命令stop后发现并不能关闭这多个数据库，因为每个数据库还需要对multi_admin用户进行授权
连接第一个数据库授权
# /usr/local/mysql/bin/mysql --socket=/var/run/mysqld/mysql00.socket
mysql> grant shutdown on *.* to 'multi_admin'@'localhost' identified by 'multipass';
mysql> flush privileges;
--每个数据库都要重复做一次上面的操作，都要授权
都授权后，可以很灵活的关闭和开启指定的数据库
# /usr/local/mysql/bin/mysqld_multi --config-file=/usr/local/mysql/etc/mysqld_multi.cnf stop 0,2
# /usr/local/mysql/bin/mysqld_multi --config-file=/usr/local/mysql/etc/mysqld_multi.cnf report 0,1,2
Reporting MySQL servers
MySQL server from group: mysqld00 is not running
MySQL server from group: mysqld01 is running
MySQL server from group: mysqld02 is not running
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上面的程序是没有服务脚本的，要支持chkconfig，就得手动写
vim /etc/init.d/mysqld_multi
#!/bin/bash
# chkconfig: - 86 16
# description: start and stop the mysqld_multi service.
start () {
/usr/local/mysql/bin/mysqld_multi --config-file=/usr/local/mysql/etc/mysqld_multi.cnf start 0,1,2
}
stop () {
/usr/local/mysql/bin/mysqld_multi --config-file=/usr/local/mysql/etc/mysqld_multi.cnf stop 0,1,2
}
case "$1" in
start )
start
sleep 2
echo " ...........................[OK]"
;;
stop )
stop
sleep 2
echo " ...........................[OK]"
;;
restart )
stop
sleep 5
start
echo ".........................[OK]"
;;
* )
echo "USAGE:start|stop|restart"
;;
esac
# chmod 755 /etc/init.d/mysqld_multi
==========================================================
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MySQL实例管理器(IM)是通过TCP/IP端口运行的后台程序，用来监视和管理MySQL数据库服务器实例。MySQL实例管理器 适合Unix-类操作系统和Windows。
rpm 版默认也支持，源码版需要在编译时加上--withmysqlmanager
# /usr/local/mysql/libexec/mysqlmanager --启动程序
第一步：
手动编写配置文件
# vim /usr/local/mysql/etc/mysqlmanager.cnf
[manager]
default-mysqld-path=/usr/local/mysql/libexec/mysqld
socket=/var/run/mysqld/manager.socket
pid-file=/var/run/mysqld/manager.pid
password-file=/usr/local/mysql/etc/my.passwd --定义密码文件
monitoring-interval=2 --监控时间间隔
port=1999 --管理端口
bind-address=2.2.2.10 --管理IP
[mysqld03]
port=3303
datadir=/data03
socket=/var/run/mysqld/mysql03.socket
pid-file=/var/run/mysqld/mysql03.pid
general_log
general_log_file=/var/log/mysqld/mysql03.log
log-error=/var/log/mysqld/mysql03-err.log
user=mysql --这一句不加启动会报错
[mysqld04]
port=3304
datadir=/data04
socket=/var/run/mysqld/mysql04.socket
pid-file=/var/run/mysqld/mysql04.pid
general_log
general_log_file=/var/log/mysqld/mysql04.log
log-error=/var/log/mysqld/mysql04-err.log
user=mysql
[mysqld05]
port=3305
datadir=/data05
socket=/var/run/mysqld/mysql05.socket
pid-file=/var/run/mysqld/mysql05.pid
general_log
general_log_file=/var/log/mysqld/mysql05.log
log-error=/var/log/mysqld/mysql05-err.log
user=mysql
第二步：
创建相关目录，修改权限
# mkdir /data03 /data04 /data05 /var/log/mysqld /var/run/mysqld/
# chown mysql.mysql /data03 /data04 /data05 /var/log/mysqld /var/run/mysqld/ /usr/local/mysql/etc/mysqlmanager.cnf
第三步：
初始化数据库
# /usr/local/mysql/bin/mysql_install_db --datadir=/data03 --user=mysql
# /usr/local/mysql/bin/mysql_install_db --datadir=/data04 --user=mysql
# /usr/local/mysql/bin/mysql_install_db --datadir=/data05 --user=mysql
第四步：创建密码文件
# /usr/local/mysql/libexec/mysqlmanager --passwd >> /usr/local/mysql/etc/my.passwd
# cat /usr/local/mysql/etc/my.passwd
li:*23AE809DDACAF96AF0FD78ED04B6A265E05AA257
--因为mysql5.1.x版本上面的mysqlmanager程序有BUG，不能生成，所以就用rpm版mysqlmanager程序来替代生成
# /usr/libexec/mysqlmanager --passwd > /usr/local/mysql/etc/my.passwd
Creating record for new user.
Enter user name: li
Enter password:
Re-type password:
第五步：启动数据库
# /usr/local/mysql/libexec/mysqlmanager --defaults-file=/usr/local/mysql/etc/mysqlmanager.cnf &
第六步：通过管理IP地址登录
# /usr/local/mysql/bin/mysql -h 2.2.2.10 -P 1999 -u li -p123
mysql> show instances;
mysql> show instance status mysqld03;
mysql> stop instance mysqld03;
mysql> start instance mysqld03;
mysql> show instance options mysqld03;
mysql> show mysqld1 log files;