在同一台机启动多个MySQL服务
此功能给我带来的很大的方便，现在简要总结出来，以便给朋友们有所帮助。在同一台机启动多个MySQL服务，多个服务可以是不同版本，同时运行。
以下给出一个简单的例子，只做个思路引导，在Linux平台中同时运行MySQL5.0和MySQL6.0两个服务，需要注意的是在安装时需要用MySQL的non RPM packages包的类型安装，方便安装到不同的目录中，可以从http://dev.mysql.com/downloads/mysql/5.0.html#linux得到下载包。
服务启动1、启动MySQL5.0(默认的方式，正常启动)
2、登陆MySQL5.0
# mysql -S /opt/lampp/var/mysql/mysql.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.0.45 Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql>
3、启动MySQL6.0
# bin/mysqld_safe --datadir=/usr/local/mysql/data --basedir=/usr/local/mysql --socket=/tmp/my.sock --port=3307&
5237
# Starting mysqld daemon with databases from /usr/local/mysql/data
4、登陆MySQL6.0
# mysql -S /tmp/my.sock
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 6.0.2-alpha MySQL Community Server (GPL)
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> 监控和查看MySQL运行情况1、查看进程
ps -ef|grep mysql
netstat -nl
2、查看端口
# netstat -nl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:3307 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:858 0.0.0.0:* LISTEN
tcp 0 0 :::22 :::* LISTEN
udp 0 0 0.0.0.0:68 0.0.0.0:*
udp 0 0 0.0.0.0:852 0.0.0.0:*
udp 0 0 0.0.0.0:855 0.0.0.0:*
udp 0 0 0.0.0.0:111 0.0.0.0:*
udp 0 0 0.0.0.0:631 0.0.0.0:*
......远程登陆这两个MySQL服务的方法1、先在服务器上设置远程登陆的帐号及权限
mysql> grant all on *.* to 'root'@'%' identified by 'xxxx';
Query OK, 0 rows affected (0.02 sec)
2、远程登陆（需要任意MySQL客户端）
C:\>mysql -uroot -proot -h192.168.0.5 -P 3306
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4 to server version: 5.0.45
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql>
C:\>mysql -uroot -proot -192.168.0.5 -P 3307
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4 to server version: 6.0.2-alpha
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> 如果服务器繁忙，可以用来部署负载均衡...
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