Nginx配置参数详解

  #user  nobody;
  worker_processes  1;#线程数通常设置成和cpu数量相同

  #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;#单个后台worker process进程的最大并发链接数 
                # 并发总数是 worker_processes 和 worker_connections 的乘积
                # 即 max_clients = worker_processes * worker_connections
                # 在设置了反向代理的情况下，max_clients = worker_processes * worker_connections / 4  为什么
               # 为什么上面反向代理要除以4，应该说是一个经验值
               # 根据以上条件，正常情况下的Nginx Server可以应付的最大连接数为：4 * 8000 = 32000
               # worker_connections 值的设置跟物理内存大小有关
               # 因为并发受IO约束，max_clients的值须小于系统可以打开的最大文件数
               # 而系统可以打开的最大文件数和内存大小成正比，一般1GB内存的机器上可以打开的文件数大约是10万左右
 }


 http {
    #设定mime类型,类型由mime.type文件定义
     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 指令指定 nginx 是否调用 sendfile 函数（zero copy 方式）来输出文件，
#对于普通应用，必须设为 on,
#如果用来进行下载等应用磁盘IO重负载应用，可设置为 off，
#以平衡磁盘与网络I/O处理速度，降低系统的uptime.
sendfile        on;
#tcp_nopush     on;

#keepalive_timeout  0;
keepalive_timeout  65;
  #开启gzip压缩
gzip  on;

server {
    listen       80;
    server_name  localhost;

    #charset koi8-r;

    #access_log  logs/host.access.log  main;

    location / {
      #允许跨域，在头文件中添加 'Access-Control-Allow-Origin' '*'
        add_header 'Access-Control-Allow-Origin' '*';
    #设置客户端访问的真实头文件
         proxy_set_header Host $host;
    #设置客户端访问代理的真实ip
       proxy_set_header X-Real-IP $remote_addr; 
       proxy_pass http://172.16.6.1;
    }

    #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 ssl;
#    server_name  localhost;

#    ssl_certificate      cert.pem;
#    ssl_certificate_key  cert.key;

#    ssl_session_cache    shared:SSL:1m;
#    ssl_session_timeout  5m;

#    ssl_ciphers  HIGH:!aNULL:!MD5;
#    ssl_prefer_server_ciphers  on;

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

}