#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;
  server {
    listen    80;
    server_name localhost;
    #charset koi8-r;
    #access_log logs/host.access.log main;
    location / {
      root  html;
      index index.html index.htm;
    }
    #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;
  #  }
  #}
}

...       #全局块
events {     #events块
  ...
}
http   #http块
{
  ...  #http全局块
  server    #server块
  { 
    ...    #server全局块
    location [PATTERN]  #location块
    {
      ...
    }
    location [PATTERN] 
    {
      ...
    }
  }
  server
  {
   ...
  }
  ...   #http全局块
}

########### 每个指令必须有分号结束。#################
#user administrator administrators; #配置用户或者组，默认为nobody nobody。
#worker_processes 2; #允许生成的进程数，默认为1
#pid /nginx/pid/nginx.pid;  #指定nginx进程运行文件存放地址
error_log log/error.log debug; #制定日志路径，级别。这个设置可以放入全局块，http块，server块，级别以此为：debug|info|notice|warn|error|crit|alert|emerg
events {
  accept_mutex on;  #设置网路连接序列化，防止惊群现象发生，默认为on
  multi_accept on; #设置一个进程是否同时接受多个网络连接，默认为off
  #use epoll;   #事件驱动模型，select|poll|kqueue|epoll|resig|/dev/poll|eventport
  worker_connections 1024;  #最大连接数，默认为512
}
http {
  include    mime.types;  #文件扩展名与文件类型映射表
  default_type application/octet-stream; #默认文件类型，默认为text/plain
  #access_log off; #取消服务日志  
  log_format myFormat '$remote_addr–$remote_user [$time_local] $request $status $body_bytes_sent $http_referer $http_user_agent $http_x_forwarded_for'; #自定义格式
  access_log log/access.log myFormat; #combined为日志格式的默认值
  sendfile on;  #允许sendfile方式传输文件，默认为off，可以在http块，server块，location块。
  sendfile_max_chunk 100k; #每个进程每次调用传输数量不能大于设定的值，默认为0，即不设上限。
  keepalive_timeout 65; #连接超时时间，默认为75s，可以在http，server，location块。
  upstream mysvr {  
   server 127.0.0.1:7878;
   server 192.168.10.121:3333 backup; #热备
  }
  error_page 404 https://www.baidu.com; #错误页
  server {
    keepalive_requests 120; #单连接请求上限次数。
    listen    4545;  #监听端口
    server_name 127.0.0.1;  #监听地址    
    location ~*^.+$ {    #请求的url过滤，正则匹配，~为区分大小写，~*为不区分大小写。
      #root path; #根目录
      #index vv.txt; #设置默认页
      proxy_pass http://mysvr; #请求转向mysvr 定义的服务器列表
      deny 127.0.0.1; #拒绝的ip
      allow 172.18.5.54; #允许的ip      
    } 
  }
}