nginx启动命令和默认配置文件的使用

# 默认配置文件启动
./nginx
# 停止
./nginx -s stop
# 重启，加载默认配置文件  
./nginx -s reload
# 启动指定某个配置文件
./nginx -c /usr/local/nginx/conf/nginx.conf

#user  nobody;					# 指定nginx worker进程运行以及用户组
worker_processes  1;

#error_log  logs/error.log;		# 错误日志的存放路径
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;		# 进程pid存放路径

# 事件模块指令，用来指定nginx的io模型，nginx支持的有select、poll、kqueue、epoll等。不同的是epoll用在linux平台上，而kqueue用在bsd系统中，对于linux系统，epoll工作模式是首选
events {
	use epoll;
	# 定义nginx每个进程的最大连接数，作为服务器来说：worker_connections * worker_processes；作为反向代理来说，最大并发数量为：worker_connections * worker_processes / 2，因为反向代理服务器，每个并发会建立与客户端的连接和与后端服务的连接，会占用两个连接
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

	# 自定义服务日志
    #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;

	# 是否开启高效传输模式 on开启 off关闭
    sendfile        on;
    # 减少网络报文段的数量
    #tcp_nopush     on;
	
	# 客户端连接超时时间
    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;
	
	# 虚拟主机的配置
    server {
        listen       80;		# 虚拟主机的服务端口
        server_name  localhost;	# 用来指定ip地址或域名，多个域名之间用空格分开

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

		# url地址匹配
        location / {
            root   html;					# 服务默认启动目录
            index  index.html index.htm;	# 默认访问文件，按照顺序找
        }

        #error_page  404              /404.html;	# 错误状态码的显示页面

        # 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;
    #    }
    #}

}

server {
    listen       80;
    server_name  localhost a.com;

    location / {
        root   html;
        index  index.html index.htm;
    }
    location /img {
        alias /usr/local/img/;
    }
}