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

user nginx;
# 運行用戶，默認是nginx

worker_processes auto;
# nginx進程數,一般設置為和cpu核數一樣

error_log /var/log/nginx/error.log;
# 全局錯誤日誌路徑

pid /run/nginx.pid;
# 進程pid路徑

# Load dynamic modules. See /usr/share/nginx/README.dynamic.
# 負載動態模塊
include /usr/share/nginx/modules/*.conf;

events {
# 工作模式與連接數上限
    worker_connections 1024;
   # 單個進程的最大連接數
}

http {
# 設置http服務器
    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‘;
    # 設置日誌的格式

    access_log  /var/log/nginx/access.log  main;
    # 訪問日誌的路徑

    sendfile            on;
    # 開啟高效傳輸模式
    tcp_nopush          on;
    # 激活tcp_nopush參數可以允許把http response header和文件的開始放在一個文件裏發布，作用是減少網絡報文段的數量
    tcp_nodelay         on;
    # 激活tcp_nodelay，內核會等待將更多的字節組成一個數據包，從而提高I/O性能
    keepalive_timeout   65;
    # 長連接超時時間，單位是秒
    types_hash_max_size 2048;
    # 為了快速處理靜態數據集，例如服務器名稱， 映射指令的值，MIME類型，請求頭字符串的名稱，nginx使用哈希表

    include             /etc/nginx/mime.types;
    # 文件擴展名與類型映射表
    default_type        application/octet-stream;
    # 默認文件類型

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # 加載模塊化配置文件
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
 
    server {
    # 基於域名的虛擬主機
        listen       80 default_server;
        # 監聽端口
        listen       [::]:80 default_server;
        server_name  _;
        # 域名
        root         /usr/share/nginx/html;
        # 站點根目錄，即網站程序存放目錄

        # Load configuration files for the default server block.
        # 默認服務器塊的加載配置文件
        include /etc/nginx/default.d/*.conf;

        location / {
        # 對“/”啟用反向代理
        }

        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 {
#        }
#    }

}

nginx默認的配置文件詳解