MySQL多实例配置

创建MySQL数据存放目录

[root@  localhost   data]# cd /data
[root@localhost data]# mkdir mysql-3306
[root@localhost data]# mkdir mysql-3307
[root@localhost data]# chown mysql:mysql mysql-3306 mysql-3307 -R
[root@localhost data]# /usr/local/mysql/scripts/mysql_install_db --user=mysql --datadir=/data/mysql-3306 --basedir=/usr/local/mysql
[root@localhost data]# /usr/local/mysql/scripts/mysql_install_db --user=mysql --datadir=/data/mysql-3307 --basedir=/usr/local/mysql
[root@localhost data]# cp /usr/local/mysql/support-files/mysqld_multi.server /etc/init.d/mysqld_multi

编辑my.cnf配置文件，添加/修改如下节点

[root@localhost data]# vim /etc/my.cnf

[mysqld_multi]
mysqld = /usr/local/mysql/bin/mysqld_safe
mysqladmin = /usr/local/mysql/bin/mysqladmin

[mysqld3306]
socket = /tmp/mysql-3306.sock
port = 3306
pid-file = /usr/local/mysql/var/mysql-3306.pid
datadir = /data/mysql-3306

[mysqld3307]
socket = /tmp/mysql-3307.sock
port = 3307
pid-file = /usr/local/mysql/var/mysql-3307.pid
datadir = /data/mysql-3307

启动MySQL

[root@localhost data]# /etc/init.d/mysqld_multi start
WARNING: my_print_defaults command not found.
Please make sure you have this command available and
in your path. The command is available from the latest
MySQL distribution.
ABORT: Can't find command 'my_print_defaults'.
This command is available from the latest MySQL
distribution. Please make sure you have the command
in your PATH.

[root@localhost data]# export PATH=/usr/local/mysql/bin:$PATH
[root@localhost data]# /etc/init.d/mysqld_multi start

验证配置

[root@localhost tmp]# /usr/local/mysql/bin/mysql -h127.0.0.1 -P3306
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 34
Server version: 5.5.22-log Source distribution

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

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

mysql> SHOW VARIABLES LIKE 'socket';
+---------------+----------------------+
| Variable_name | Value                |
+---------------+----------------------+
| socket        | /tmp/mysql-3306.sock |
+---------------+----------------------+
1 row in set (0.00 sec)


[root@localhost data]# /usr/local/mysql/bin/mysql -h127.0.0.1 -P3307
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 34
Server version: 5.5.22-log Source distribution

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

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

mysql> SHOW VARIABLES LIKE 'socket';
+---------------+----------------------+
| Variable_name | Value                |
+---------------+----------------------+
| socket        | /tmp/mysql-3307.sock |
+---------------+----------------------+
1 row in set (0.00 sec)