下载编译环境：
yum install gcc bison pkgconfig glib2-devel gettext make httpd-devel gcc-c++ libstdc++-devel

下载并解压源代码:
wget http://ftp.novell.com/pub/mono/sources/mono/mono-2.6.3.tar.bz2
wget http://ftp.novell.com/pub/mono/sources/mod_mono/mod_mono-2.6.3.tar.bz2
wget http://ftp.novell.com/pub/mono/sources/xsp/xsp-2.6.3.tar.bz2
tar -jxvf mono-2.6.3.tar.bz2
tar -jxvf xsp-2.6.3.tar.bz2
tar -jxvf mod_mono-2.6.3.tar.bz2

安装mono环境:
cd /root/mydir/mono-2.6.3
./configure --prefix=/opt/mono; make ; make install
echo export PKG_CONFIG_PATH=/opt/mono/lib/pkgconfig:$PKG_CONFIG_PATH~/.bash_profile
echo export PATH=/opt/mono/bin:$PATH~/.bash_profile
source ~/.bash_profile

安装xsp:
cd /root/mydir/xsp-2.6.3
./configure --prefix=/opt/mono; make ; make install

安装mod_mono:
先用find / -iname apr*config命令查找出“--with-apr-config=/usr/bin/apr-1-config”（不知道--with-apr-config=/usr/bin/apr-1-config有什么用，好像不要也可以，麻烦知道的告诉一下小弟）
再执行下面的命令：
cd /root/mydir/mod_mono-2.6.3
./configure --prefix=/opt/mono --with-mono-prefix=/opt/mono --with-apr-config=/usr/bin/apr-1-config; make ; make install
cp /etc/httpd/conf.d/ /etc/httpd/conf/mod_mono.conf

selinux阻止了httpd对mod-mono-server的访问，所以执行下面的语句：
setsebool -P httpd_disable_trans=1

重启httpd服务器：
service httpd restart

在防火墙中开启80端口，允许同一个Lan的其他机器访问：
方法1.在不使用图形界面工具的时候，通过关闭防火墙来实现允许开放80端口
service iptables stop
（PS：我尝试过下面的方法，
vi /etc/sysconfig/iptables
添加：-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
service iptables restart
虽然在iptables -L中看到http
但无法从其他机器访问该服务器。
如果有谁成功，请告知小弟）：

方法2.在安装有图形界面工具的情况下，用startx进入图形界面，用“Security Level and Firewall”开启80端口。

安装libgdiplus(xsp的测试页面中，有很多都需要libgdiplus):
yum install httpd build-essential gcc bzip bison pkgconfig glib-devel \
glib2-devel httpd-devel libpng-devel libX11-devel freetype fontconfig \
pango-devel ruby ruby-rdoc gtkhtml38-devel wget
wget http://ftp.novell.com/pub/mono/sources/libgdiplus/libgdiplus-2.6.2.tar.bz2
tar -jxvf libgdiplus-2.6.2.tar.bz2
cd /root/mydir/libgdiplus-2.6.2
./configure
make ; make install
echo export LD_LIBRARY_PATH=/usr/local/lib/:$LD_LIBRARY_PATH ~/.bash_profile
source ~/.bash_profile

vi /opt/mono/etc/mono/config
添加节点：<dllmap dll="gdiplus.dll" target="/usr/lib/libgdiplus.so.0" />
否则会出现DllNotFoundException的异常。

测试：
一、测试mono
a.运行mono -V输出：
Mono JIT compiler version 2.6.3 (tarball Fri Apr 2 06:13:46 CST 2010)
Copyright (C) 2002-2010 Novell, Inc and Contributors. http://www.mono-project.com/
TLS: __thread
GC: Included Boehm (with typed GC and Parallel Mark)
SIGSEGV: altstack
Notifications: epoll
Architecture: x86
Disabled: none
b.运行mono-test-install输出：
Active Mono: /opt/mono/bin/mono
Your have a working System.Drawing setup
Your file system watcher is: System.IO.InotifyWatcher

二、测试Asp.Net服务器
a.测试是否能够执行aspx：
在/var/www/html/目录下建一个test.aspx页面，内容为
<%="Hello World!"%>
通过wget http://localhost/test.aspx来下载该页面的内容。

b.测试同一个Lan下其他机器能否访问：
用其他机器的浏览器打开http://ip/test.aspx

c.跑xsp自带的测试程序（多点几个页面，查看是否会出现gdiplus.dll DllNotFoundException的一场）：
1.修改Apache的配置，开放防火墙8080端口
Listen 8080
NameVirtualHost *:8080
<VirtualHost *:8080>
ServerAdmin hlfstephen@gmail.com
DocumentRoot /var/www/test/
ServerName local.mydomain.com
ErrorLog logs/local.mydomain.com-error_log
CustomLog logs/local.mydomain.com common
</VirtualHost>
2.复制/opt/mono/lib/xsp/test目录到var/www/下
3.service httpd restart
4.用浏览器打开http://ip:8080/

参考：
http://blog.rubypdf.com/2009/10/23/how-to-install-mono-2-4-2-3-on-centos-5/
http://blog.rubypdf.com/2009/10/23/how-to-install-xsp-and-integrate-xsp-with-apache-2-under-centos-5/
http://blog.bennyland.com/2010/02/06/serving-asp-net-pages-in-apache-on-centos-5/
http://mingster.com/site/?q=content/mono-2x-centos-5
http://mono-project.com/DllNotFoundException
http://mono-project.com/Config_DllMap