操作系统：CentOS 5.5（1）安装MySQL在该操作系统上安装MySQL最方便的方法是使用yum进行安装：[root@localhost yum.repos.d]# yu

操作系统：CentOS 5.5

（1）安装MySQL

在该操作系统上安装MySQL最方便的方法是使用yum进行安装：

[root@localhost yum.repos.d]# yum install mysql-server(有时网络比较慢的话，会花费较多的时间，如何配置本地yum源的方法，我将在另一篇blog上做详细的介绍)

（2）查看MySQL是否启动

安装完MySQL以后，可以查看一下当前mysql是否已经启动：

[root@localhost yum.repos.d]# netstat -tl | grep mysql

tcp 0 0 *:mysql *:* LISTEN

如果是像上面这样的输出，说明mysql已经成功启动了。如果没有输出，说明mysql还没有启动。
（3）启动MySQL
可以使用如下命令启动MySQL.
[root@localhost yum.repos.d]# /etc/init.d/mysqld start
Initializing MySQL database: Installing MySQL system tables...
110301 13:23:14 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295
110301 13:23:14 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295
OK
Filling help tables...
110301 13:23:14 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295
110301 13:23:14 [Warning] option 'max_join_size': unsigned value 18446744073709551615 adjusted to 4294967295
OK
To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system
PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:
/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h localhost.localdomain password 'new-password'
Alternatively you can run:
/usr/bin/mysql_secure_installation
which will also give you the option of removing the test
databases and anonymous user created by default. This is
strongly recommended for production servers.
See the manual for more instructions.
You can start the MySQL daemon with:
cd /usr ; /usr/bin/mysqld_safe &
You can test the MySQL daemon with mysql-test-run.pl
cd mysql-test ; perl mysql-test-run.pl
Please report any problems with the /usr/bin/mysqlbug script!
The latest information about MySQL is available on the web at

Support MySQL by buying support/licenses at [ OK ]
Starting MySQL: [ OK ]
（4）设置root密码
首次进入mysql是不需要密码的，，
[root@localhost yum.repos.d]# mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.0.77 Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> Bye
使用mysqladmin设置root密码:
[root@localhost yum.repos.d]# mysqladmin -uroot password yourpassword
重新登录
[root@localhost yum.repos.d]# mysql -uroot -p
Enter password: