httpd：是一个提供网站服务的程序
监听端口：80
环境准备：
Linux CentOS7.3系统
使用一台服务端，一台客户端即可；
一、安装httpd
1：安装
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# setensorce 0
[root@localhost ~]# rpm -e httpd –nodeps #卸载系统自带的httpd
[root@localhost ~]# mkdir /media/cdrom #创建挂载点文件夹
[root@localhost ~]# mount /dev/cdrom /media/cdrom #挂载光盘
[root@localhost ~]# yum -y install gcc* apr-devel apr-util-devel pcre-devel #安装开发包
[root@localhost ~]# tar zxvf httpd-2.4.25.tar.gz #解压缩包
[root@localhost ~]# cd httpd-2.4.25
[root@localhost httpd-2.4.25]# ./configure --prefix=/usr/local/httpd --enable-so --enable-rewrite --enable-charset-lite --enable-cgi
注释：
--prefix：制定程序的安装目录
--enable-so：启用动态加载模块DSO的支持，使httpd具备进一步扩展功能的能力
--enable-rewrite：启用网页地址重写功能，用于网站优化
--enable-charset-lite：启动字符集支持，以便支持使用各种字符集编码的网页
--enable-cgi：启用cgi脚本程序支持，扩展网站的应用访问能力
[root@localhost httpd-2.4.25]# make && make install
[root@localhost httpd-2.4.25]# ls /usr/local/httpd
[root@localhost httpd-2.4.25]# /usr/local/httpd/bin/apachectl start
[root@localhost httpd-2.4.25]# netstat -anpt |grep httpd
[root@localhost httpd-2.4.25]# /usr/local/httpd/bin/apachectl stop
[root@localhost httpd-2.4.25]# netstat -anpt |grep httpd
2：优化执行路径
[root@localhost httpd-2.4.25]# ln -s /usr/local/httpd/bin/* /usr/local/bin/
[root@localhost httpd-2.4.25]# ls -l /usr/local/bin/httpd /usr/local/bin/apachectl
#查看软连接
[root@localhost httpd-2.4.25]# httpd -v
[root@localhost httpd-2.4.25]# apachectl start
[root@localhost httpd-2.4.25]# netstat -anpt |grep httpd
[root@localhost httpd-2.4.25]# apachectl stop
[root@localhost httpd-2.4.25]# netstat -anpt |grep httpd
3：添加httpd系统服务
使用chkconfig添加为系统服务
[root@localhost httpd-2.4.25]# cp /usr/local/httpd/bin/apachectl /etc/init.d/httpd #复制配置文件
[root@localhost httpd-2.4.25]# vi /etc/init.d/httpd //编辑配置文件
添加：
#!/bin/sh
#chkconfig:35 85 21
#description:httpd server
[root@localhost httpd-2.4.25]# chkconfig --add httpd &nb