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本文講利用MySQL源碼安裝MySQL并用mysqld_multi配置多實例。

1、下載MySQL源碼安裝版本

到MySQL官網查找到相應版本下載，本文下載的是5.1版本

代碼如下:

wget -c ftp://ftp.mirrorservice.org/sites/ftp.mysql.com/Downloads/MySQL-5.1/mysql-5.1.60.tar.gz

2、解壓安裝

代碼如下:

tar -zxv -f mysql-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 && make install

3、添加用戶和用戶組

代碼如下:

groupadd mysql #添加mysql用戶組

useradd -g mysql mysql #創建mysql用戶并把它放到mysql組下

chown -R root:mysql /usr/local/mysql #修改mysql文件屬性

4、初始化數據目錄

代碼如下:

#把用到的工具添加到/usr/bin目錄

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

#初始化四個數據目錄

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

#修改屬性

chown -R mysql /usr/local/var/mysql1

chown -R mysql /usr/local/var/mysql2

chown -R mysql /usr/local/var/mysql3

chown -R mysql /usr/local/var/mysql4

5、配置多實例啟動腳本

從MySQL的源碼中把復制到/etc/init.d/目錄下

代碼如下:

cp /usr/local/src/mysql-5.1.60/support-files/mysqld_multi.server /etc/init.d/mysqld_multi.server

#修改basedir和bindir為安裝路徑

basedir=/usr/local/mysql

bindir=/usr/local/mysql/bin

6、配置多實例數據庫配置文件

用mysqld_multi工具查看該配置文件的模板方法，命令為：mysqld_multi --example

在/etc/目錄下創建創建文件/etc/mysqld_multi.cnf，把mysqld_multi --example產生的文件粘進去，修改相應屬性，如：mysqld,mysqladmin,socket,port,pid-file,datadir,user等。

代碼如下:

[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、啟動多實例數據庫

代碼如下:

將/usr/local/mysql/bin加到$PATH環境變量里

export PATH=/usr/local/mysql/bin:$PATH

#查看數據庫狀態

mysqld_multi --defaults-extra-file=/etc/mysqld_multi.cnf report

#結果都為沒有運行

Reporting MySQL servers

MySQL server from group: mysqld1 is not running

MySQL server from group: mysqld2 is not running

MySQL server from group: mysqld3 is not running

MySQL server from group: mysqld4 is not running

#啟動

mysqld_multi --defaults-extra-file=/etc/mysqld_multi.cnf start

#結果為

Reporting MySQL servers

MySQL server from group: mysqld1 is not running

MySQL server from group: mysqld2 is not running

MySQL server from group: mysqld3 is not running

MySQL server from group: mysqld4 is not running

#啟動具體某一個實例可在start、stop后面加上具體數據1,2,3等

8、查看運行結果

代碼如下:

#查看相應端口是否已經被監聽

netstat -tunlp

#查看是否有活動進程

ps -aux|grep mysql

9、登錄相應數據庫

代碼如下:

#進入端口為3306的數據庫

mysql -uroot -p -h127.0.0.1 -P3306

#通過sock文件登錄

mysql -uroot -p -S /usr/local/var/mysql1/mysql1.sock

#查看socket文件

mysql> SHOW VARIABLES LIKE 'socket';

#查看pid文件

mysql> SHOW VARIABLES LIKE '%pid%';

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