FreeBSD 8.1下用nginx配置简单web负载均衡

cd /usr/ports/www/nginx
make install clean
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#user  nobody;
worker_processes  4;

#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 webserver {
      server 192.168.21.45 weight=1;
      server 192.168.4.45  weight=1;
                        }

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

	location / {
	proxy_pass      http://webserver;
	proxy_redirect          off;
	proxy_set_header        Host $host;
	proxy_set_header        X-Real-IP $remote_addr;
	proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
	client_max_body_size    10m;
	client_body_buffer_size 128k;
	proxy_connect_timeout   90;
	proxy_send_timeout      90;
	proxy_read_timeout      90;
	proxy_buffer_size       4 32k;
	proxy_temp_file_write_size 64k;
          }


        #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   /usr/local/www/nginx-dist;
        }

        # 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  ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
    #    ssl_prefer_server_ciphers   on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}
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worker_processes  4; #这个与服务器的核数等同即可
upstream #这个里面的weight值越大，服务器所要承担的压力也越大；如果采用ip_hash模块时，就不能分配weight了，不然Nginx启动时会报错
proxy_set_header        Host $host;
proxy_set_header        X-Real-IP $remote_addr;
proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
#以上配置是让后端的web服务器可以通过X-Forwarded-For获取客户端的真实IP
#允许客户端请求的最大的单个文件字节数
client_max_body_size     10m;
#缓冲区代理缓冲用户端请求的最大字节数 可以理解为先保存到本地再传给用户
client_body_buffer_size  128k;
#跟后端服务器连接的超时时间_发起握手等候响应超时时间
proxy_connect_timeout    90;
#连接成功后_等候后端服务器响应时间_其实已经进入后端的排队之中等候处理
proxy_read_timeout       90;
#后端服务器数据回传时间_就是在规定时间之内后端服务器必须传完所有的数据
proxy_send_timeout       90;
#代理请求缓存区_这个缓存区间会保存用户的头信息以供Nginx进行规则处理，一般只要能保存下头信息即可
proxy_buffer_size        8k;
#同上 告诉Nginx保存单个用的几个Buffer 最大用多大空间
proxy_buffers            4 32k;
#如果系统很忙的时候可以申请更大的proxy_buffers 官方推荐*2	
proxy_busy_buffers_size 64k;
#proxy缓存临时文件的大小
proxy_temp_file_write_size 64k;
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