MySQL -2- 体系结构-多实例模块

0、在已创建mysql,port=3306的数据库前提下

需要删除/etc/.my.cnf再做以下操作 cp /etc/my.cnf /etc/my.cnf.3306

1、mkdir -p /u02/data/{3307,3308,3309}/data
2、chown -R mysql:mysql /u02/data/{3307,3308,3309}/data

3、创建/etc/my.cnf文件（多实例情况下的my.cnf）

[mysqld_multi]
mysqld = /u02/app/mysql/bin/mysqld_safe
mysqladmin = /u02/app/mysql/bin/mysqladmin
#user = root
#password ="root123"

[mysqld3307]
datadir = /u02/data/3307/data
port = 3307
socket = /tmp/mysql3307.sock
#log-bin = /u02/data/3307/data/mysql-bin
pid-file = /u02/data/3307/data/mysql_3307.pid
log-error=/var/log/3307.log


[mysqld3308]
datadir = /u02/data/3308/data
port = 3308
socket = /tmp/mysql3308.sock
#log-bin = /u02/data/3308/data/mysql-bin
pid-file = /u02/data/3308/data/mysql_3308.pid
log-error=/var/log/3308.log


[mysqld3309]
datadir = /u02/data/3309/data
port = 3309
socket = /tmp/mysql3309.sock
#log-bin = /u02/data/3309/data/mysql-bin
pid-file = /u02/data/3309/data/mysql_3309.pid
log-error=/var/log/3309.log

4.初始化,创建基础的数据库文件

mysqld --initialize-insecure --user=mysql --datadir=/u02/data/3307/data --basedir=/u02/app/mysql
mysqld --initialize-insecure --user=mysql --datadir=/u02/data/3308/data --basedir=/u02/app/mysql
mysqld --initialize-insecure --user=mysql --datadir=/u02/data/3309/data --basedir=/u02/app/mysql

5、启动多实例服务

mysqld_multi start --启动全部实例
mysqld_multi start 3307 --启动3307实例
mysqld_multi start 3308 --启动3308实例
start 3309 --启动3309实例
若同时起3306时，/etc/my.cnf已被3306使用，此时多实例为/etc/mysqld_multi.cnf,则登陆时为
mysqld_multti --defaults-extra-file=/etc/mysqld_multi.cnf start 3307

6、初始化密码

mysqladmin -uroot password root3307 -S /tmp/mysql3307.sock
mysqladmin -uroot password root3308 -S /tmp/mysql3308.sock
mysqladmin -uroot password root3309 -S /tmp/mysql3309.sock

7、登录

mysql -uroot -p -S /tmp/mysql3307.sock
Enter password: root3307

mysql> select * from mysql.user;
mysql>show databases;