Linux安装多个MySQL

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　　1、按照常规安装。

[root@ff_girl mysql5122]# chown -R root .
[root@ff_girl mysql5122]# chown -R mysql data
[root@ff_girl mysql5122]# chgrp -R mysql .
[root@ff_girl mysql5122]# cp support-files/my-small.cnf /etc/my5122.cnf
[root@ff_girl mysql5122]# scripts/mysql_install_db --basedir=/usr/local/mysql5122/ --datadir=/usr/local/mysql5122/data/ --user=mysql
Installing MySQL system tables...
OK
Filling help tables...
OK

To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system

。。。

　　首次启动MYSQL

[root@ff_girl mysql5122]# bin/mysqld_safe --defaults-file=/etc/my5122.cnf &
[1] 13700
[root@ff_girl mysql5122]# 080124 15:01:46 mysqld_safe Logging to '/usr/local/mysql5122/data/localhost.localdomain.err'.
080124 15:01:46 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql5122/data

[root@ff_girl mysql5122]# bin/mysql -uroot -p -S/tmp/mysql5122.sock
Enter password:
Welcome to the MySQL monitor.　Commands end with ; or g.
Your MySQL connection id is 1
Server version: 5.1.22-rc MySQL Community Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql show databases;
+--------------------+
| Database　　　　　 |
+--------------------+
| information_schema |
| mysql　　　　　　　|
| test　　　　　　　 |
+--------------------+
3 rows in set (0.00 sec)

　　给MYSQLD_MULTI赋SHUTDOWN权限。

mysql grant shutdown on *.* to multi_admin@'localhost' identified by '123456';
Query OK, 0 rows affected (0.00 sec)

mysql flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql exit
Bye

　　停掉MYSQL服务。

[root@ff_girl ~]# /usr/local/mysql5122/bin/mysqladmin -uroot -p -S/tmp/mysql5122.sock shutdown
Enter password:
[root@ff_girl ~]#

　　拷贝元数据。

[root@ff_girl mysql5122]# cp data data2
[root@ff_girl mysql5122]# mv data data1
[root@ff_girl mysql5122]# chown -R mysql data2
[root@ff_girl mysql5122]# chgrp -R mysql .

　　示例配置文件

　　[
root@ff_girl mysql5122]# cat /etc/my5122.cnf
[mysqld_multi]
mysqld　　 = /usr/local/mysql5122/bin/mysqld_safe
mysqladmin = /usr/local/mysql5122/bin/mysqladmin
user　　　 = multi_admin
password　 = 123456
# The MySQL server
[mysqld1]
socket　　 = /tmp/mysql1.sock
port　　　 = 3307
pid-file　 = /usr/local/mysql5122/data1/david_yeung.pid1
datadir　　= /usr/local/mysql5122/data1
language　 = /usr/local/mysql5122/share/mysql/english
user　　　 = mysql
# The MySQL server
[mysqld2]
port　　　　　　= 3308
socket　　　　　= /tmp/mysql2.sock
pid-file　 = /usr/local/mysql5122/data2/david_yeung.pid2
datadir　　= /usr/local/mysql5122/data2
language　 = /usr/local/mysql5122/share/mysql/english
user　　　 = mysql
。。。
[isamchk]
key_buffer = 8M
sort_buffer_size = 8M

[myisamchk]
key_buffer = 8M
sort_buffer_size = 8M

[mysqlhotcopy]
interactive-timeout
[root@ff_girl mysql5122]#

　　启动两个MYSQL服务

[root@ff_girl mysql5122]# /usr/local/mysql5122/bin/mysqld_multi --config-file=/etc/my5122.cnf start 1-2
[root@ff_girl mysql5122]# netstat -an | grep 3307
tcp　　　　0　　　0 0.0.0.0:3307　　　　　　　　0.0.0.0:*　　　　　　　　　 LISTEN　　　
[root@ff_girl mysql5122]# netstat -an | grep 3308
tcp　　　　0　　　0 0.0.0.0:3308　　　　　　　　0.0.0.0:*　　　　　　　　　 LISTEN　　　
[root@ff_girl mysql5122]# /usr/local/mysql/bin/mysql -uroot -p -S/tmp/mysql1.sock
Enter password:
Welcome to the MySQL monitor.　Commands end with ; or g.
Your MySQL connection id is 1
Server version: 5.1.22-rc-log MySQL Community Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql q
Bye
[root@ff_girl mysql5122]# /usr/local/mysql/bin/mysql -uroot -p -S/tmp/mysql2.sock
Enter password:
Welcome to the MySQL monitor.　Commands end with ; or g.
Your MySQL connection id is 1
Server version: 5.1.22-rc-log MySQL Community Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql q
Bye
[root@ff_girl mysql5122]#

　　2、另外一种。

[root@ff_girl mysql512]# chown -R root .
[root@ff_girl mysql512]# chown -R mysql data
[root@ff_girl mysql512]# chgrp -R mysql .
[root@ff_girl mysql512]# scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql512/ --datadir=/usr/local/mysql512/data/
[root@ff_girl mysql512]# cp support-files/my-huge.cnf /etc/my512.cnf

　　并且修改如下部分。

[client]
port　　　　　　= 3308
socket　　　　　= /tmp/mysql512.sock

# The MySQL server
[mysqld]
user=mysql
basedir=/usr/local/mysql512
datadir=/usr/local/mysql512/data
port　　　　　　= 3308
socket　　　　　= /tmp/mysql512.sock

[root@ff_girl mysql512]# /usr/local/mysql512/bin/mysqld_safe --defaults-file=/etc/my512.cnf &
[root@ff_girl mysql512]# /usr/local/mysql/bin/mysql -uroot -p -S/tmp/mysql512.sock
Enter password:
Welcome to the MySQL monitor.　Commands end with ; or g.
Your MySQL connection id is 1
Server version: 5.1.22-rc-log MySQL Community Server (GPL)

Type 'help;' or 'h' for help. Type 'c' to clear the buffer.

mysql show databases;
+--------------------+
| Database　　　　　 |
+--------------------+
| information_schema |
| mysql　　　　　　　|
| test　　　　　　　 |
+--------------------+
3 rows in set (0.00 sec)

mysql q
Bye

　　确定3308端口是否在运行。

[root@ff_girl mysql512]# netstat -an |grep 3308
tcp　　　　0　　　0 0.0.0.0:3308　　　　　　　　0.0.0.0:*　　　　　　　　　 LISTEN　

　　把脚本写到启动文件里：

/usr/local/mysql512/bin/mysqld_safe --defaults-file=/etc/my512.cnf