七层负载均衡

七层负载均衡:
	根据url 调度不同的集群   url.oldxu.com
	10.0.0.5
	10.0.0.7		/pass
	10.0.0.8		/user
	
	
1.web01和web02配置  (只不过代码不一样)
[root@web01 conf.d]# cat url.oldxu.com.conf 
server {
	listen 80;
	server_name url.oldxu.com;
	root /code;

	location / {
		index index.html;
	}
}

2.lb配置
[root@lb01 conf.d]# cat proxy_url.oldxu.com.conf 
upstream user {
	server 172.16.1.8;
}
upstream pass {
	server 172.16.1.7;
}

server {
	listen 80;
	server_name url.oldxu.com;
	location / {
		proxy_pass http://user;
		include proxy_params;
	}
	location /user {
                proxy_pass http://user;
                include proxy_params;
	}
	location /pass {
                proxy_pass http://pass;
                include proxy_params;
	}
}
[root@lb01 conf.d]# systemctl restart nginx
	
	PS: 在使用proxy_pass反向代理时,最后结尾添加/和不添加/有什么区别?
	
	1.不添加 / 
		用户如果请求:    http://url.oldxu.com/user
		会被代理至后端:  http://url.oldxu.com/user
	
	1.添加 / 
		用户如果请求: http://url.oldxu.com/user
		会被代理至后端:  http://url.oldxu.com/
	
	
	根据设备调度不同的集群   			( 浏览器 )  ( 手机 )
	10.0.0.5
	10.0.0.7		pc
	10.0.0.8		phone
	
1.所有的web都需要配置   ( 代码不一样)
[root@web01 conf.d]# cat /etc/nginx/conf.d/agent.oldxu.com.conf 
server {
	listen 80;
	server_name agent.oldxu.com;
	root /code;

	location / {
		index index.html;
	}

}

2.代理的配置
[root@lb01 conf.d]# cat proxy_agent.oldxu.com.conf 
upstream pc {
	server 172.16.1.7:80;
}

upstream phone {
	server 172.16.1.8:80;
}

server {
	listen 80;
	server_name agent.oldxu.com;
	location / {
		#默认都走pc
		proxy_pass http://pc;
		include proxy_params;
		default_type text/html;
		charset utf-8;

		#如果是安卓或iphone,则走phone
		if ( $http_user_agent ~* "android|iphone|iPad" ) {
			proxy_pass http://phone;
		}

		#如果是IE浏览器,要么拒绝,要么返回一个好的浏览器下载页面
		if ( $http_user_agent ~*  "MSIE" ) {
			return 200 '<a href="http://download.xuliangwei.com/gitlab-ce-8.3.4-ce.0.el7.x86_64.rpm" target="_blank">点击下载正版浏览器google.exe</a>';
		}
	}
}