编译安装httpd服务
首先，编译安装http，需要有它的源码包，这里提供官方下载：http://httpd.apache.org
我使用的是httpd-2.4.4.tar.bz2软件包
在进行源码编译安装之前，我们需要设定一下安装环境
1、安装开发包组：
# yum groupinstall "Development tools" "Server Platform Development" "Desktop Platform Development" "Compatibility libraries"
这四个包组，最好都安装下。
2、安装apr
APR(Apache portable Run-time libraries，Apache可移植运行库)的目的如其名称一样，主要为上层的应用程序提供一个可以跨越多操作系统平台使用的底层支持接口库。
因为http2.4版本需要apr的版本是1.4以上，原来1.3的不能用了。
# tar xf apr-1.4.6.tar.bz2
# cd apr-1.4.6
# ./configure --prefix=/usr/local/apr
# make ; make install
# tar xf apr-util-1.5.2.tar.bz2
# cd apr-util-1.5.2
# ./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr/
# make && make install
安装完成
3、安装httpd-2.4.6
# tar xf httpd-2.4.6.tar.bz2
# cd httpd-2.4.6
# ./configure --prefix=/usr/local/apache --sysconfdir=/etc/httpd --enable-so --enable-ssl --enable-cgi --enable-rewrite --with-zlib --with-pcre --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util --enable-modules=most --enable-mpms-shared=all --with-mpm=event
简略解释选项含义：
--enable-so 启用动态支持
--with-zlib 使用zlib压缩库，将数据压缩再传输
--enable-modules=most 启用哪些模块
--enable-mpms-shared=all 把哪些模块做成动态共享模块
--with-mpm=event 默认启用的mpm
安装过程中提示了缺少pcre，故安装了pcre的devel包
# yum -y install pcre-devel
# make && make install
配置初始化参数：
# vim /etc/profile.d/httpd.sh
export PATH=/usr/local/apache/bin:$PATH
# . /etc/profile.d/httpd.sh
# /usr/local/apache/bin/apachectl start
查看已经安装的各个模块：
# httpd -D DUMP_MODULES
Loaded Modules:
core_module (static)
so_module (static)
http_module (static)
authn_file_module (shared)
authn_core_module (shared)
authz_host_module (shared)
authz_groupfile_module (shared)
authz_user_module (shared)
authz_core_module (shared)
access_compat_module (shared)
auth_basic_module (shared)
reqtimeout_module (shared)
filter_module (shared)
mime_module (shared)
log_config_module (shared)
env_module (shared)
headers_module (shared)
setenvif_module (shared)
version_module (shared)
mpm_event_module (shared) event模型
unixd_module (shared)
status_module (shared)
autoindex_module (shared)
dir_module (shared)
alias_module (shared)
httpd服务工作在event模型下的，安装时我们指定的。
4、配置主配置文件
# vim /etc/httpd24/httpd.conf
# Virtual hosts
Include /etc/httpd24/extra/httpd-vhosts.conf
若想启用虚拟主机，先注释
#DocumentRoot "/usr/local/apache/htdocs"
然后启用虚拟主机选项
Include /etc/httpd24/extra/httpd-vhosts.conf
# vim extra/httpd-vhosts.conf
<VirtualHost *:80>
ServerName www.a.com
DocumentRoot "/apache/host1"
CustomLog /var/log/httpd/httpd_a_access_log combined
<Directory "/apache/host1">
Options None
AllowOverride none
Require all granted
</Directory>
</VirtualHost>
然后启动httpd即可，用客户端进行访问。
