用yum安装MySql
打入如下命令：
[root@mysql ~]# yum -y install mysql-server //自动从网上搜索资源并自动下载安装
[root@mysql ~]# chkconfig mysqld on //设置开机启动MySql服务
检查是否为开机启动
打入命令：[root@mysql ~]# chkconfig –list
看到：mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off 即表示已设置为开机启动，2、3、4、5为on
启动MySql服务
/etc/rc.d/init.d/mysqld start //从文件启动MySql服务
service mysqld start //以服务名方式启动
MySql初始化环境设置（一）
设置MySQL的root用户设置密码，因为MySQL被安装时，它的root用户时没有设置密码的。
[root@mysql ~]# mysql -u root
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.1.61 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>
2. 如上，默认是不需要密码就可以进入数据库操作，下面查看MySQL数据库用户信息
MySql初始化环境设置（二）
打入命令：select user,host,password from mysql.user; //可以看到密码都为空
+------+-----------+----------+
| user | host | password |
+------+-----------+----------+
| root | localhost | |
| root | mysql | |
| root | 127.0.0.1 | |
| | localhost | |
本栏目更多精彩内容：http://www.bianceng.cn/database/MySQL/
| | mysql | |
+------+-----------+----------+
5 rows in set (0.00 sec)
set password for root@localhost=password(‘123456789’); //设置root用户密码为123456789
MySql初始化环境设置（三）
打入命令：select user,host,password from mysql.user; //查看刚设置的密码，可以看到密码已经经过加密处理
+------+-----------+-------------------------------------------+
| user | host | password |
+------+-----------+-------------------------------------------+
| root | localhost | *CC67043C7BCFF5EEA5566BD9B1F3C74FD9A5CF5D |
| root | mysql | |
| root | 127.0.0.1 | |
| | localhost | |
| | mysql | |
+------+-----------+-------------------------------------------+
5 rows in set (0.00 sec)
打入exit命令退出数据库连接，测试root密码是否生效