CentOS 5.5 使用yum来安装 LAMP （Apache+Mysql+php5)

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今天用yum方法搭建起了个LAMP环境，中间遇到了很多问题，经过google和各位前辈的帮助，终于将环境搭建起来，现在把完整的步骤记录下来，　　1.  换源，sohu的相当好用。
　　1.1备份CentOS-Base.repo
　　cd /etc/yum.repos.d/
　　cp CentOS-Base.repo CentOS-Base.repo.bak
　　1.2替换源
　　用vi打开CentOS-Base.repo，并将内容清空，然后将下面的内容复制进去，并保存。
　　# CentOS-Base.repo
　　#
　　# This file uses a new mirrorlist system developed by Lance Davis for CentOS.
　　# The mirror system uses the connecting IP address of the client and the
　　# update status of each mirror to pick mirrors that are updated to and
　　# geographically close to the client.  You should use this for CentOS updates
　　# unless you are manually picking other mirrors.
　　#
　　# If the mirrorlist= does not work for you, as a fall back you can try the
　　# remarked out baseurl= line instead.
　　#
　　#
　　[base]
　　name=CentOS-$releasever – Base
　　baseurl=http://mirrors.sohu.com/centos/$releasever/os/$basearch/
　　gpgcheck=1
　　gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5
　　#released updates
　　[updates]
　　name=CentOS-$releasever – Updates
　　baseurl=http://mirrors.sohu.com/centos/$releasever/updates/$basearch/
　　gpgcheck=1
　　gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5

　　#packages used/produced in the build but not>　　[addons]
　　name=CentOS-$releasever – Addons
　　baseurl=http://mirrors.sohu.com/centos/$releasever/addons/$basearch/
　　gpgcheck=1
　　gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5
　　#additional packages that may be useful
　　[extras]
　　name=CentOS-$releasever – Extras
　　baseurl=http://mirrors.sohu.com/centos/$releasever/extras/$basearch/
　　gpgcheck=1
　　gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5
　　#additional packages that extend functionality of existing packages
　　[centosplus]
　　name=CentOS-$releasever – Plus
　　baseurl=http://mirrors.sohu.com/centos/$releasever/centosplus/$basearch/
　　gpgcheck=1
　　enabled=0
　　gpgkey=http://mirrors.sohu.com/centos/RPM-GPG-KEY-CentOS-5
　　1.3更新一下。
　　yum -y update
　　2.  用yum安装Apache,Mysql,PHP.
　　2.1安装Apache
　　yum install httpd httpd-devel
　　安装完成后，用/etc/init.d/httpd start 启动apache
　　设为开机启动:chkconfig httpd on
　　2.2 安装mysql
　　2.2.1 yum install mysql mysql-server mysql-devel
　　同样，完成后，用/etc/init.d/mysqld start 启动mysql
　　2.2.2 设置mysql密码 mysqladmin -uroot password "123aaa"
　　mysql>; USE mysql;
　　mysql>; UPDATE user SET Password=PASSWORD(‘newpassword’) WHERE user=’root’;
　　mysql>; FLUSH PRIVILEGES;
　　2.2.3 允许远程登录
　　mysql -u root -p
　　Enter Password:

　　mysql>GRANT ALL PRIVILEGES ON *.* TO ‘用户名’@'%’>　　完成后就能用mysql-front远程管理mysql了。
　　2.2.4 设为开机启动
　　chkconfig mysqld on
　　3.  安装php
　　yum install php php-mysql php-common php-gd php-mbstring php-mcrypt php-devel php-xml
　　/etc/init.d/httpd start
　　4.  测试一下
　　4.1在/var/www/html/新建个test.php文件，将以下内容写入，然后保存。
　　
　　4.2 防火墙配置
　　a.添加.允许访问端口{21: ftp, 80: http}.
　　iptables -I RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 21 -j ACCEPT
　　iptables -I RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT
　　b.关闭防火墙{不推荐}.
　　service iptables stop
　　c.重置加载防火墙
　　service iptables restart
　　4.3然后在客户端浏览器里打开http://serverip/test.php，若能成功显示，则表示安装成功。
　　至此，安装完毕。