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

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

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

groupadd mysql #添加mysql用戶組
useradd -g mysql mysql #創建mysql用戶並把它放到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

#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、配置多實例啓動腳本

    從MySQL的源碼中把複製到/etc/init.d/目錄下

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

#修改basedir和bindir爲安裝路徑
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，命令爲：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。

[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、啓動多實例數據庫

將/usr/local/mysql/bin加到$PATH環境變量裏
export PATH=/usr/local/mysql/bin:$PATH

#查看數據庫狀態
mysqld_multi --defaults-extra-file=/etc/mysqld_multi.cnf report
#結果都爲沒有運行
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

#啓動
mysqld_multi --defaults-extra-file=/etc/mysqld_multi.cnf start
#結果爲
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

#啓動具體某一個實例可在start、stop後面加上具體數據1,2,3等

 

8、查看運行結果

#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

#進入端口爲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%';