nginx代理和负载均衡

• web节点

[[email protected] ~]# cat /etc/nginx/conf.d/web.oldxu.com.conf 
server {
	listen 8080;
	server_name web.oldxu.com;
	root /web;

	location / {
		index index.html;
	}
}

• 代理配置

[[email protected] ~]# cat /etc/nginx/conf.d/proxy_web.oldxu.com.conf 
server {
	listen 80;
	server_name web.oldxu.com;

	location / {
		proxy_pass http://10.0.0.7:8080;
	}
}

代理参数

[[email protected] ~]# cat /etc/nginx/conf.d/proxy_web.oldxu.com.conf 
server {
	listen 80;
	server_name web.oldxu.com;

	location / {
		proxy_pass http://10.0.0.7:80;
		include proxy_params;
		
	}
}
[[email protected] ~]# cat /etc/nginx/proxy_params 
proxy_set_header Host $http_host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_http_version 1.1;
proxy_set_header Connection "";

proxy_connect_timeout 30;
proxy_send_timeout 60;
proxy_read_timeout 60;

proxy_buffering on;
proxy_buffer_size 32k;
proxy_buffers 4 128k;

负载均衡

[[email protected] ~]# cat  /etc/nginx/conf.d/proxy_web.oldxu.com.conf 
upstream web {
	server 10.0.0.7:8000;
	server 10.0.0.8:8000;
}

server {
	listen 80;
	server_name web.oldxu.com;

	location / {
		proxy_pass http://web;
		include proxy_params;
		
	}
}

后端web配置 (所有的web都需要配置一致)

[[email protected] conf.d]# cat web.oldxu.com.conf 
server {
	listen 8000;
	server_name web.oldxu.com;
	root /web;

	location / {
		index index.html;
	}
}

[[email protected] conf.d]# cat web.oldxu.com.conf 
server {
	listen 8000;
	server_name web.oldxu.com;
	root /web;

	location / {
		index index.html;
	}
}

blog zh 集成
1.确保所有的web节点都安装好了blog或者zh 并得确保是能正常访问的
2.接入负载均衡

如果出现问题:
	将负载均衡--->代理到指定的一台服务器   测试     在换一台  测试 

配置如下:

[[email protected] conf.d]# cat proxy_blog.oldxu.com.conf 
upstream blog {
	server 172.16.1.7:80;
	server 172.16.1.8:80;
}


server {
	listen 80;
	server_name blog.oldxu.com;

	location / {
		proxy_pass http://blog;
		include proxy_params;
	}
}

[[email protected] conf.d]# cat blog.oldxu.com.conf 
server {
	listen 80;
	server_name blog.oldxu.com;
	root /code/wordpress;
	client_max_body_size 100m;

	location / {
		index index.php index.html;
	}

	location ~ \.php$ {
		fastcgi_pass 127.0.0.1:9000;
		fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
		include fastcgi_params;
	}
}

[[email protected] conf.d]# cat proxy_zh.oldxu.com.conf 
upstream zh {
	server 172.16.1.7:80;
	server 172.16.1.8:80;
}


server {
	listen 80;
	server_name zh.oldxu.com;

	location / {
		proxy_pass http://zh;
		include proxy_params;
	}
}

[[email protected] conf.d]# cat zh.oldxu.com.conf 
server {
	listen 80;
	server_name zh.oldxu.com;
	root /code/zh;
	client_max_body_size 100m;

	location / {
		index index.php;
	}
	location ~ \.php$ {
		fastcgi_pass 127.0.0.1:9000;
		fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
		include fastcgi_params;
	}
}

负载均衡调度算法

调度算法	概述
轮询	按时间顺序逐一分配到不同的后端服务器(默认)
weight	加权轮询,weight值越大,分配到的访问几率越高 4 16G 8 64G
ip_hash	每个请求按访问IP的hash结果分配,这样来自同一IP的固定访问一个后端服务器
url_hash	按照访问URL的hash结果来分配请求,是每个URL定向到同一个后端服务器
least_conn	最少链接数,那个机器链接数少就分发

2.后端的节点状态指标

状态	概述
down	当前的server暂时不参与负载均衡
backup	预留的备份服务器
max_fails	允许请求失败的次数
fail_timeout	经过max_fails失败后, 服务暂停时间
max_conns	限制最大的接收连接数

[[email protected] conf.d]# cat proxy_web.oldxu.com.conf 
upstream web {
	server 10.0.0.7:80 max_conns=1000 max_fails=3 fail_timeout=10s;
	server 10.0.0.8:80 max_conns=1000 max_fails=3 fail_timeout=10s;
	
	keepalive 16;	#最大的空闲连接数
	keepalive_timeout 100s; #超时时间
	keepalive_requests 50;  #一个连接最大的请求数
	
	#负载均衡与后端的连接和请求数的限制	
	#注意:需要配置  proxy_http_version   proxy_set_header Connection "";
}
server {
	listen 80;
	server_name web.oldxu.com;

	location / {
		proxy_pass http://web;
		include proxy_params;	
	}
}

会话保持

置一个网站:  
	1.测试session是否存储至于本地
	2.配置多个web节点
	3.接入负载均衡   --->轮询  -->正常登陆
	
	
	第一步:  记得测试
	[[email protected] ~]# cat /etc/nginx/conf.d/phpmyadmin.oldxu.com.conf 
	server {
		listen 80;
		server_name phpmyadmin.oldxu.com;
		root /code/phpmyadmin;

		location / {
			index index.php;
		}

		location ~ \.php$ {
			fastcgi_pass 127.0.0.1:9000;
			fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
			include fastcgi_params;
		}
	}

	第二步配置phpmyadmin
		[[email protected] ~]# cd /code/phpmyadmin/
		[[email protected] phpmyadmin]# cp config.sample.inc.php config.inc.php 
	
	第三步修改配置文件(修改为需要连接的数据库IP地址)
		[[email protected] phpmyadmin]# vim config.inc.php 
			$cfg['Servers'][$i]['host'] = '172.16.1.51';
	
	第四步配置第二个节点:  记得测试
	

	第五步: 接入负载均衡
	[[email protected] ~]# cat /etc/nginx/conf.d/proxy_phpmyadmin.oldxu.com.conf 
	upstream php {
		server 172.16.1.7:80;
		server 172.16.1.8:80;
	}


	server {
		listen 80;
		server_name phpmyadmin.oldxu.com;

		location / {
			proxy_pass http://php;
			include proxy_params;
		}
	}