腊月的季节

node集群与nginx负载均衡

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多机器的均衡

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npm  install http-proxy

负载均衡示例

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var proxyServer = require('http-proxy');
var port = parseInt(process.argv[2]);
var servers=[
{
    host:"localhost",
    port:8081
},
{
    host:"localhost",
    port:8080
}];
proxyServer.createServer(function(req,res,proxy){
    var target =servers.shift();
    proxy.proxyRequest(req,res,target);
    servers.push(target);
}).listen(port);

使用nginx负载均衡

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#user  nobody;
worker_processes  1;
#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid		logs/nginx.pid;

events {
	worker_connections  1024;
}
http {
	include	   mime.types;
	default_type  application/octet-stream;

	#log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
	#				  '$status $body_bytes_sent "$http_referer" '
	#				  '"$http_user_agent" "$http_x_forwarded_for"';
	#access_log  logs/access.log  main;

	sendfile		on;
	#tcp_nopush	 on;
	#keepalive_timeout  0;
	keepalive_timeout  65;
	#gzip  on;
	upstream node_app {
	  server 127.0.0.1:8080;
	  server 127.0.0.1:8081;
	}
	server {
		listen	   80;
		server_name  localhost;
		#charset koi8-r;
		#access_log  logs/host.access.log  main;

		location / {
			root   html;
			index  index.html index.htm;
		}
		location /foo {
		  proxy_redirect off;
		  proxy_set_header   X-Real-IP			$remote_addr;
		  proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
		  proxy_set_header   X-Forwarded-Proto $scheme;
		  proxy_set_header   Host				   $http_host;
		  proxy_set_header   X-NginX-Proxy	true;
		  proxy_set_header   Connection "";
		  proxy_http_version 1.1;
		  proxy_pass		 http://node_app;
		}
		#error_page  404			  /404.html;

		# redirect server error pages to the static page /50x.html
		#
		error_page   500 502 503 504  /50x.html;
		location = /50x.html {
			root   html;
		}
		# proxy the PHP scripts to Apache listening on 127.0.0.1:80
		#
		#location ~ \.php$ {
		#	proxy_pass   http://127.0.0.1;
		#}
		# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
		#
		#location ~ \.php$ {
		#	root		   html;
		#	fastcgi_pass   127.0.0.1:9000;
		#	fastcgi_index  index.php;
		#	fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
		#	include		fastcgi_params;
		#}
		# deny access to .htaccess files, if Apache's document root
		# concurs with nginx's one
		#
		#location ~ /\.ht {
		#	deny  all;
		#}
	}
	# another virtual host using mix of IP-, name-, and port-based configuration
	#
	#server {
	#	listen	   8000;
	#	listen	   somename:8080;
	#	server_name  somename  alias  another.alias;
	#	location / {
	#		root   html;
	#		index  index.html index.htm;
	#	}
	#}
	# HTTPS server
	#
	#server {
	#	listen	   443;
	#	server_name  localhost;
	#	ssl				  on;
	#	ssl_certificate	  cert.pem;
	#	ssl_certificate_key  cert.key;
	#	ssl_session_timeout  5m;
	#	ssl_protocols  SSLv2 SSLv3 TLSv1;
	#	ssl_ciphers  HIGH:!aNULL:!MD5;
	#	ssl_prefer_server_ciphers   on;
	#	location / {
	#		root   html;
	#		index  index.html index.htm;
	#	}
	#}
}

upstream服务器
upstream node_app {
server 127.0.0.1:8080;
server 127.0.0.1:8081;
}
处理请求 任何的到/foo的请求都会被代理到之前配置的nodejs服务器上

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location /foo {
  proxy_redirect off;
  proxy_set_header   X-Real-IP            $remote_addr;
  proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
  proxy_set_header   X-Forwarded-Proto $scheme;
  proxy_set_header   Host                   $http_host;
  proxy_set_header   X-NginX-Proxy    true;
  proxy_set_header   Connection "";
  proxy_http_version 1.1;
  proxy_pass         http://node_app;
}

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