vim /etc/nginx/nginx.conf

// 设置nginx服务的系统使用用户
user  nginx;
// 工作进程数                      
worker_processes  1;       

error_log  /var/log/nginx/error.log warn;  // nginx的错误日志
pid        /var/run/nginx.pid;      // nginx服务启动时候pid

//事件模块，nginx优势利用epoll内核模型，在这里可以配置使用哪个内核模型
events {
    // 每个进程允许最大连接数 ，还有个use是工作进程数                                                      
    worker_connections  1024;               
}


http {
    // 设置contentType                                                  
    include       /etc/nginx/mime.types;  
    default_type  application/octet-stream;
    // 定义日志类型
    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  /var/log/nginx/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;   // 服务端超时时间

    #gzip  on;
    // 读到这个地方是加载另一个默认配置配置文件default.conf
    include /etc/nginx/conf.d/*.conf;      
}

default.conf

server {
    listen       80;
    server_name  localhost;

    #charset koi8-r;
    #access_log  /var/log/nginx/host.access.log  main;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;  // 默认加载根路径文件
    }

    #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/share/nginx/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;
"/etc/nginx/conf.d/default.conf" 45L, 1093C 

Q.E.D.