2021-10-11 一起來學習Nginx吧！

官方介紹：
“Nginx是一款輕量級的HTTP服務器，采用事件驅動的異步非阻塞處理方式框架，這讓其具有極好的IO性能，時常用于服務端的反向代理和負載均衡，”

Nginx的優點

1. 支持海量高并發：采用IO多路復用epoll，官方測驗Nginx能夠支持5萬并發鏈接，實際生產環境中可以支撐2-4萬并發連接數，
2. 記憶體消耗少：在主流的服務器中Nginx目前是記憶體消耗最小的了，比如我們用Nginx+PHP，在3萬并發鏈接下，開啟10個Nginx行程消耗150M記憶體，
3. 免費使用可以商業化：Nginx為開源軟體，采用的是2-clause BSD-like協議，可以免費使用，并且可以用于商業，
4. 組態檔簡單：網路和程式配置通俗易懂，即使非專業運維也能看懂，

現在Nginx非常火 ：我們可以通過https://w3techs.com/ 這個網站看到，Nginx在服務器中排在第二位，但是是上升最快的網站，占有率達到39.7%，
組態檔

#user  nobody;
worker_processes  4;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


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

    #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;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       81;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   D:\project2\data-center-ui\dist;
            index  index.html index.htm;
        }

        location  ^~ /backend/ {
           proxy_pass  http://192.168.1.2:8082/admin/; #后端系統連接地址，即前面步驟配置的應用訪問地址，如果在weblogic中為應用配置了應用背景關系，則在這里也要加上
           proxy_set_header Host $http_host;
		   proxy_set_header X-Real-IP $remote_addr;
		   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }

        #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   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;
    #    }
    #}

}