安装phpmyadmin,遇到几个问题，，记录一下要点：
安装phpmyadmin
解压到/var/www
配置apache
listen 8030
documentroot /var/www/phpmyadmin
cp config.sample.inc.php config.inc.php
vi config.inc.php
修改以下段
/*
* first server
*/
$i++;
/* authentication type */
$cfg['servers'][$i]['auth_type'] = 'cookie';
/* server parameters */
$cfg['servers'][$i]['host'] = 'localhost';
$cfg['servers'][$i]['connect_type'] = 'tcp';
$cfg['servers'][$i]['compress'] = false;
/* select mysqli if your server has it */
$cfg['servers'][$i]['extension'] = 'mysql';
$cfg['servers'][$i]['allownopassword'] = false;
连接多个host，复制上面一段，改变一下$cfg['servers'][$i]['host']即可，
在登录的时候会多亿个host选择框。
redhat php升级到5.2
搜到一个简单的方法
wget -q -o - | sh
yum update php
重启apache
service httpd restart
mysql安装
./configure && make && make install
安装基本库
scripts/mysql_install_db
[按提示设置root密码]
选择配置文件
cp support-files/my-huge.cnf /etc/my.cnf
vi /etc/my.cnf 增加以下内容
[client]
default-character-set=utf8
default-character-set=utf8
[mysqld]
datadir = /opt/mysql_data
default-character-set=utf8
增加mysql用户
adduser mysql
赋权限给mysql用户
chown -r mysql.mysql /opt/mysql_data
设置自启动
cp support-files/mysql.server /etc/init.d/mysql
赋执行权限
chomd +x /etc/init.d/mysql
启动mysql
service mysql restart