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MySQL多实例讲解

Jun 07, 2016 pm 05:12 PM
database

mysql多实例,每个MySQL多实例讲解实例的datadir,pid,port,socket应该是不同的,在Unix中,在你启动客户端之前,设置MYSQL_UNIX_P

mysql多实例,每个实例的datadir,pid,port,socket应该是不同的

一、基础,很重要

每个实例应该在自己的datadir下配置my.cnf文件。
首先说下配置文件的查找顺序
第一搜,首先读取/etc/my.cnf
第二搜,$datadir/my.cnf,在data目录下寻找此配置文件,每个实例应该在自己的datadir下配置my.cnf文件。
第三搜,defaultfile=/path/my.cnf 通常写在命令行上,mysqld_safe defaultfile=/tmp/my.cnf &等执行。
第四搜,~/my.cnf 当前用户下的配置文件。


二、为各个实例配置datadir(例子中利用默认实例数据)

停掉mysql默认的服务(防止出现损坏默认实例数据库的情况):service mysql

stop

复制datadir
[root@localhost lib]# cp -r mysql /var/lib/mysql_3301
[root@localhost lib]# cp -r mysql /var/lib/mysql_3302

把mysql设置为owner
[root@localhost lib]# chown -R mysql.mysql mysql_3301
[root@localhost lib]# chown -R mysql.mysql mysql_3302

把mysql设置为文件夹内文件的owner
[root@localhost lib]# cd mysql_3301
[root@localhost mysql_3301]# chown -R mysql.mysql *
[root@localhost mysql_3301]# cd ../mysql_3302
[root@localhost mysql_3302]# chown -R mysql.mysql *

注释:
开始失败的原因在于mysql_3301与mysql_3302文件夹下的文件没有赋权于mysql用

户,,导致错误
cd mysql_3301
chown -R mysql.mysql *
cd ../mysql_3302
chown -R mysql.mysql *

三、配置文件选项:

[root@localhost mysql_3302]# cd /usr/local
[root@localhost local]# vi my_multi.cnf

[mysqld_multi]
mysqld     = /usr/bin/mysqld_safe
mysqladmin = /usr/bin/mysqladmin
user       = root

[mysqld1]
socket     = /tmp/mysql_3301.sock
port       = 3301
pid-file   = /var/lib/mysql_3301/hostname.pid
datadir    = /var/lib/mysql_3301/
log        = /var/lib/mysql_3301/hostname.log
user       = mysql


[mysqld2]
socket     = /tmp/mysql_3302.sock
port       = 3302
pid-file   = /var/lib/mysql_3302/hostname.pid
datadir    = /var/lib/mysql_3302/
log        = /var/lib/mysql_3302/hostname.log
user       = mysql

linux

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