使用mysqld_multi实现单系统中配置多个MySQL服务器实例
本文讲利用MySQL源码安装MySQL并用mysqld_multi配置多实例。
1、下载MySQL源码安装版本
到MySQL官网查找到相应版本下载，本文下载的是5.1版本
wget-cftp://ftp.mirrorservice.org/sites/ftp.mysql.com/Downloads/MySQL-5.1/mysql-5.1.60.tar.gz
2、解压安装
tar-zxv-fmysql-5.1.60.tar.gz ./configure--prefix=/usr/local/mysql--with-charset=utf8 --with-extra-charset=all--enable-thread-safe-client--enable-assembler --with-readline--with-big-tables --with-named-curses-libs=/usr/lib/libncursesw.so.5 make&&makeinstall
3、添加用户和用户组
groupaddmysql#添加mysql用户组 useradd-gmysqlmysql#创建mysql用户并把它放到mysql组下 chown-Rroot:mysql/usr/local/mysql#修改mysql文件属性
4、初始化数据目录
#把用到的工具添加到/usr/bin目录 ln-s/usr/local/mysql/bin/mysqld_multi/usr/bin/mysqld_multi ln-s/usr/local/mysql/bin/mysql_install_db/usr/bin/mysql_install_db #初始化四个数据目录 mysql_install_db--datadir=/usr/local/var/mysql1--user=mysql mysql_install_db--datadir=/usr/local/var/mysql2--user=mysql mysql_install_db--datadir=/usr/local/var/mysql3--user=mysql mysql_install_db--datadir=/usr/local/var/mysql4--user=mysql #修改属性 chown-Rmysql/usr/local/var/mysql1 chown-Rmysql/usr/local/var/mysql2 chown-Rmysql/usr/local/var/mysql3 chown-Rmysql/usr/local/var/mysql4
5、配置多实例启动脚本
从MySQL的源码中把复制到/etc/init.d/目录下
cp/usr/local/src/mysql-5.1.60/support-files/mysqld_multi.server/etc/init.d/mysqld_multi.server #修改basedir和bindir为安装路径 basedir=/usr/local/mysql bindir=/usr/local/mysql/bin
6、配置多实例数据库配置文件
用mysqld_multi工具查看该配置文件的模板方法，命令为：mysqld_multi--example
在/etc/目录下创建创建文件/etc/mysqld_multi.cnf，把mysqld_multi--example产生的文件粘进去，修改相应属性，如：mysqld,mysqladmin,socket,port,pid-file,datadir,user等。
[mysqld_multi] mysqld =/usr/local/mysql/bin/mysqld_safe mysqladmin=/usr/local/mysql/bin/mysqladmin #user =mysql #password =my_password [mysqld1] socket =/usr/local/var/mysql1/mysql1.sock port =3306 pid-file =/usr/local/var/mysql1/mysql1.pid datadir =/usr/local/var/mysql1 #language =/usr/local/mysql/share/mysql/english user =mysql [mysqld2] socket =/usr/local/var/mysql2/mysql2.sock port =3307 pid-file =/usr/local/var/mysql2/mysql2.pid datadir =/usr/local/var/mysql2 #language =/usr/local/mysql/share/mysql/english user =mysql [mysqld3] socket =/usr/local/var/mysql3/mysql3.sock port =3308 pid-file =/usr/local/var/mysql3/mysql3.pid datadir =/usr/local/var/mysql3 #language =/usr/local/mysql/share/mysql/english user =mysql [mysqld4] socket =/usr/local/var/mysql4/mysql4.sock port =3309 pid-file =/usr/local/var/mysql4/mysql4.pid datadir =/usr/local/var/mysql4 #language =/usr/local/mysql/share/mysql/english user =mysql
7、启动多实例数据库
将/usr/local/mysql/bin加到$PATH环境变量里 exportPATH=/usr/local/mysql/bin:$PATH #查看数据库状态 mysqld_multi--defaults-extra-file=/etc/mysqld_multi.cnfreport #结果都为没有运行 ReportingMySQLservers MySQLserverfromgroup:mysqld1isnotrunning MySQLserverfromgroup:mysqld2isnotrunning MySQLserverfromgroup:mysqld3isnotrunning MySQLserverfromgroup:mysqld4isnotrunning #启动 mysqld_multi--defaults-extra-file=/etc/mysqld_multi.cnfstart #结果为 ReportingMySQLservers MySQLserverfromgroup:mysqld1isnotrunning MySQLserverfromgroup:mysqld2isnotrunning MySQLserverfromgroup:mysqld3isnotrunning MySQLserverfromgroup:mysqld4isnotrunning #启动具体某一个实例可在start、stop后面加上具体数据1,2,3等
8、查看运行结果
#查看相应端口是否已经被监听 netstat-tunlp #查看是否有活动进程 ps-aux|grepmysql
9、登录相应数据库
#进入端口为3306的数据库 mysql-uroot-p-h127.0.0.1-P3306 #通过sock文件登录 mysql-uroot-p-S/usr/local/var/mysql1/mysql1.sock #查看socket文件 mysql>SHOWVARIABLESLIKE'socket'; #查看pid文件 mysql>SHOWVARIABLESLIKE'%pid%';