简单说一下Nginx配置说明

可以参考如下的完整例子

#用户 用户组
user       www www;
#工作进程，根据硬件调整，有人说几核cpu，就配几个，我觉得可以多一点
worker_processes  5；
#错误日志
error_log  logs/error.log;
#pid文件位置
pid        logs/nginx.pid;
worker_rlimit_nofile 8192;

events {
#工作进程的最大连接数量，根据硬件调整，和前面工作进程配合起来用，尽量大，但是别把cpu跑到100%就行
    worker_connections  4096;
}

http {
    include    conf/mime.types;
    #反向代理配置，可以打开proxy.conf看看
    include    /etc/nginx/proxy.conf;
    #fastcgi配置，可以打开fastcgi.conf看看
    include    /etc/nginx/fastcgi.conf;

    default_type application/octet-stream;
    #日志的格式
    log_format   main '$remote_addr - $remote_user [$time_local] $status '
                      '"$request" $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    #访问日志
    access_log   logs/access.log  main;
    sendfile     on;
    tcp_nopush   on;
    #根据实际情况调整，如果server很多，就调大一点
    server_names_hash_bucket_size 128; # this seems to be required for some vhosts

    #这个例子是fastcgi的例子，如果用fastcgi就要仔细看
    server { # php/fastcgi
        listen       80;
        #域名，可以有多个
        server_name  domain1.com
        #访问日志，和上面的级别不一样，应该是下级的覆盖上级的
        access_log   logs/domain1.access.log  main;
        root         html;

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

        #所有php后缀的，都通过fastcgi发送到1025端口上
         #上面include的fastcgi.conf在此应该是有作用，如果你不include，那么就把fastcgi.conf的配置项放在这个下面。
        location ~ /.php$ {
            fastcgi_pass   127.0.0.1:1025;
        }
    }

    #这个是反向代理的例子
    server { # simple reverse-proxy
        listen       80;
        server_name  domain2.com
        access_log   logs/domain2.access.log  main;

        #静态文件，nginx自己处理
        location ~ ^/(images|javascript|js|css|flash|media|static)/  {
                root    /var/www/virtual/big.server.com/htdocs;
                #过期30天，静态文件不怎么更新，过期可以设大一点，如果频繁更新，则可以设置得小一点。
                expires 30d;
        }

        #把请求转发给后台web服务器，反向代理和fastcgi的区别是，反向代理后面是web服务器，fastcgi后台是fasstcgi监听进程，当然，协议也不一样。
        location / {
            proxy_pass      http://127.0.0.1:8080;
        }
    }

    #upstream的负载均衡，weight是权重，可以根据机器配置定义权重。据说nginx可以根据后台响应时间调整。后台需要多个web服务器。
    upstream big_server_com {
        server 127.0.0.3:8000 weight=5;
        server 127.0.0.3:8001 weight=5;
        server 192.168.0.1:8000;
        server 192.168.0.1:8001;
    }

    server {
        listen          80;
        server_name     big.server.com;
        access_log      logs/big.server.access.log main;

        location / {
                proxy_pass      http://big_server_com;
        }
    }
}

上面说的include的几个文件，都没有必要改，用的时候include一下就可以。

fastcgi.conf

# fastcgi.conf
fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;
fastcgi_param  QUERY_STRING       $query_string;
fastcgi_param  REQUEST_METHOD     $request_method;
fastcgi_param  CONTENT_TYPE       $content_type;
fastcgi_param  CONTENT_LENGTH     $content_length;
fastcgi_param  SCRIPT_NAME        $fastcgi_script_name;
fastcgi_param  REQUEST_URI        $request_uri;
fastcgi_param  DOCUMENT_URI       $document_uri;
fastcgi_param  DOCUMENT_ROOT      $document_root;
fastcgi_param  SERVER_PROTOCOL    $server_protocol;
fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
fastcgi_param  SERVER_SOFTWARE    nginx/$nginx_version;
fastcgi_param  REMOTE_ADDR        $remote_addr;
fastcgi_param  REMOTE_PORT        $remote_port;
fastcgi_param  SERVER_ADDR        $server_addr;
fastcgi_param  SERVER_PORT        $server_port;
fastcgi_param  SERVER_NAME        $server_name;

fastcgi_index  index.php;

# PHP only, required if PHP was built with --enable-force-cgi-redirect
fastcgi_param  REDIRECT_STATUS    200;

proxy.conf

# proxy.conf
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_buffers           32 4k;

mine.types

# mime.types
types {
    text/html                             html htm shtml;
    text/css                              css;
    text/xml                              xml rss;
    image/gif                             gif;
    image/jpeg                            jpeg jpg;
    application/x-javascript              js;
    text/plain                            txt;
    text/x-component                      htc;
    text/mathml                           mml;
    image/png                             png;
    image/x-icon                          ico;
    image/x-jng                           jng;
    image/vnd.wap.wbmp                    wbmp;
    application/java-archive              jar war ear;
    application/mac-binhex40              hqx;
    application/pdf                       pdf;
    application/x-cocoa                   cco;
    application/x-java-archive-diff       jardiff;
    application/x-java-jnlp-file          jnlp;
    application/x-makeself                run;
    application/x-perl                    pl pm;
    application/x-pilot                   prc pdb;
    application/x-rar-compressed          rar;
    application/x-redhat-package-manager  rpm;
    application/x-sea                     sea;
    application/x-shockwave-flash         swf;
    application/x-stuffit                 sit;
    application/x-tcl                     tcl tk;
    application/x-x509-ca-cert            der pem crt;
    application/x-xpinstall               xpi;
    application/zip                       zip;
    application/octet-stream              deb;
    application/octet-stream              bin exe dll;
    application/octet-stream              dmg;
    application/octet-stream              eot;
    application/octet-stream              iso img;
    application/octet-stream              msi msp msm;
    audio/mpeg                            mp3;
    audio/x-realaudio                     ra;
    video/mpeg                            mpeg mpg;
    video/quicktime                       mov;
    video/x-flv                           flv;
    video/x-msvideo                       avi;
    video/x-ms-wmv                        wmv;
    video/x-ms-asf                        asx asf;
    video/x-mng                           mng;
}

更多的，每个项的具体含义和配置选择，可以参考如下：

可以依次从,,,的顺序看。

关于配置和模块的关系是，装了什么模块，就可以用到什么配置，因此配置是灵活多变的。