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准备工作
创建三个文件夹，分别对应三个网站
[root@centos7 ~]#mkdir /data/{a,b,c}site
[root@centos7 ~]#echo www.a.com > /data/asite/index.html
[root@centos7 ~]#echo www.b.com > /data/bsite/index.html
[root@centos7 ~]#echo www.c.cn > /data/csite/index.html
添加一个IP地址
[root@centos7 ~]#ip a a 192.168.245.18 dev ens33
三个IP分别对应a,b,c三个网站
192.168.245.17
192.168.245.18
172.18.134.14
1>基于IP地址不同，创建三个虚拟主机
vim /etc/httpd/conf.d/test.conf 配置文件中加入授权及IP地址对应的目录，日志文件分别存放
<virtualhost 192.168.245.17:80>
DocumentRoot "/data/asite"
<Directory /data/asite>
Require all granted
</Directory>
</virtualhost>
customlog /var/log/httpd/access_a.log teselog
<virtualhost 192.168.245.18:80>
DocumentRoot "/data/bsite"
<Directory /data/bsite>
Require all granted
</Directory>
</virtualhost>
customlog /var/log/httpd/access_b.log teselog
<virtualhost 172.18.134.14:80>
DocumentRoot "/data/csite"
<Directory /data/csite>
Require all granted
</Directory>
</virtualhost>
customlog /var/log/httpd/access_c.log teselog
systemctl restart httpd 重启服务
分别输入三个地址
可以看到三个虚拟主机已分离
2>基于端口号不同，创建三个虚拟主机
vim /etc/httpd/conf.d/test.conf 配置文件中加入授权及IP地址对应的目录，日志文件分别存放
listen 81
listen 82
listen 83
<virtualhost *:81>
DocumentRoot "/data/asite"
<Directory /data/asite>
Require all granted
</Directory>
</virtualhost>
customlog /var/log/httpd/access_a.log teselog
<virtualhost *:82>
DocumentRoot "/data/bsite"
<Directory /data/bsite>
Require all granted
</Directory>
</virtualhost>
customlog /var/log/httpd/access_b.log teselog
<virtualhost *:83>
DocumentRoot "/data/csite"
<Directory /data/csite>
Require all granted
</Directory>
</virtualhost>
systemctl restart httpd 重启服务
注：listen监听三个端口，用*代表所有IP地址，即此主机上的所有IP都可，用81，82，83三个端口号分别代表a,b,c三个网站
可以看到三个虚拟主机已基于端口号分离
3>基于FQDN不同，创建三个虚拟主机，基于域名解析，常用
vim /etc/httpd/conf.d/test.conf 配置文件中加入授权及IP地址对应的目录，日志文件分别存放
<virtualhost *:80>
servername www.a.com
DocumentRoot "/data/asite"
<Directory /data/asite>
Require all granted
</Directory>
</virtualhost>
customlog /var/log/httpd/access_a.log teselog
<virtualhost *:80>
servername www.b.com
DocumentRoot "/data/bsite"
<Directory /data/bsite>
Require all granted
</Directory>
</virtualhost>
customlog /var/log/httpd/access_b.log teselog
<virtualhost *:80>
servername www.c.cn
DocumentRoot "/data/csite"
<Directory /data/csite>
Require all granted
</Directory>
</virtualhost>
systemctl restart httpd 重启服务
分别加入servername，去掉listen，把端口号统一
注：另外找一台虚拟机，如192.168.245.37，修改hosts，和DNS原理相同，模拟DNS解析
vim /etc/hosts 加入三个域名
192.168.245.17 www.a.com www.b.com www.c.cn
在192.168.245.37上curl
[root@centos7 ~]#curl www.a.com
www.a.com
[root@centos7 ~]#curl www.b.com
www.b.com
[root@centos7 ~]#curl www.c.cn
www.c.cn
在37主机上telnet连接测试，输入host后连续敲两次回车
[root@centos7 ~]#telnet 192.168.245.17 80
Trying 192.168.245.17...
Connected to 192.168.245.17.
Escape character is '^]'.
GET /index.html HTTP/1.1
HOST: WWW.C.CN
HTTP/1.1 200 OK
Date: Sun, 16 Dec 2018 20:59:10 GMT
Server: Apache/2.4.6 (CentOS)
Last-Modified: Sun, 16 Dec 2018 19:52:33 GMT
ETag: "9-57d2901560e36"
Accept-Ranges: bytes
Content-Length: 9
Content-Type: text/html; charset=UTF-8
www.c.cn
Connection closed by foreign host.
