使用mysqld_multi实现单系统中配置多个MySQL服务器实例

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

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  

groupadd mysql #添加mysql用户组  
useradd -g mysql mysql #创建mysql用户并把它放到mysql组下  
chown -R root:mysql /usr/local/mysql #修改mysql文件属性  

#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 -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   

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  

[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  

将/usr/local/mysql/bin加到$PATH环境变量里  
export PATH=/usr/local/mysql/bin:$PATH  
  
#查看数据库状态  
mysqld_multi --defaults-extra-file=/etc/mysqld_multi.cnf report  
#结果都为没有运行  
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  
  
#启动  
mysqld_multi --defaults-extra-file=/etc/mysqld_multi.cnf start  
#结果为  
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  
  
#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  

#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|grep mysql  

#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> SHOW VARIABLES LIKE 'socket';  
  
#查看pid文件  
mysql> SHOW VARIABLES LIKE '%pid%';