nginx默认的配置文件详解

# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
# 运行用户，默认是nginx

worker_processes auto;
# nginx进程数,一般设置为和cpu核数一样

error_log /var/log/nginx/error.log;
# 全局错误日志路径

pid /run/nginx.pid;
# 进程pid路径

# Load dynamic modules. See /usr/share/nginx/README.dynamic.
# 负载动态模块
include /usr/share/nginx/modules/*.conf;

events {
# 工作模式与连接数上限
    worker_connections 1024;
   # 单个进程的最大连接数
}

http {
# 设置http服务器
    log_format  main  '$http_host $server_addr $remote_addr [$time_local] "$request" $status  $request_body  $body_bytes_sent "$http_referer" "$http_user_agent" $request_time $upstream_response_time';
    # 设置日志的格式

    access_log  /var/log/nginx/access.log  main;
    # 访问日志的路径

    sendfile            on;
    # 开启高效传输模式
    tcp_nopush          on;
    # 激活tcp_nopush参数可以允许把http response header和文件的开始放在一个文件里发布，作用是减少网络报文段的数量
    tcp_nodelay         on;
    # 激活tcp_nodelay，内核会等待将更多的字节组成一个数据包，从而提高I/O性能
    keepalive_timeout   65;
    # 长连接超时时间，单位是秒
    types_hash_max_size 2048;
    # 为了快速处理静态数据集，例如服务器名称， 映射指令的值，MIME类型，请求头字符串的名称，nginx使用哈希表

    include             /etc/nginx/mime.types;
    # 文件扩展名与类型映射表
    default_type        application/octet-stream;
    # 默认文件类型

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # 加载模块化配置文件
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
 
    server {
    # 基于域名的虚拟主机
        listen       80 default_server;
        # 监听端口
        listen       [::]:80 default_server;
        server_name  _;
        # 域名
        root         /usr/share/nginx/html;
        # 站点根目录，即网站程序存放目录

        # Load configuration files for the default server block.
        # 默认服务器块的加载配置文件
        include /etc/nginx/default.d/*.conf;

        location / {
        # 对“/”启用反向代理
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }

# Settings for a TLS enabled server.
#
#    server {
#        listen       443 ssl http2 default_server;
#        listen       [::]:443 ssl http2 default_server;
#        server_name  _;
#        root         /usr/share/nginx/html;
#
#        ssl_certificate "/etc/pki/nginx/server.crt";
#        ssl_certificate_key "/etc/pki/nginx/private/server.key";
#        ssl_session_cache shared:SSL:1m;
#        ssl_session_timeout  10m;
#        ssl_ciphers HIGH:!aNULL:!MD5;
#        ssl_prefer_server_ciphers on;
#
#        # Load configuration files for the default server block.
#        include /etc/nginx/default.d/*.conf;
#
#        location / {
#        }
#
#        error_page 404 /404.html;
#            location = /40x.html {
#        }
#
#        error_page 500 502 503 504 /50x.html;
#            location = /50x.html {
#        }
#    }

}