一、nginx簡介:

Nginx("engine x")是一款是由俄羅斯的程式設計師Igor Sysoev所開發高效能的 Web和 反向代理 伺服器，也是一個 IMAP/POP3/SMTP 代理伺服器。
在高連線併發的情況下，Nginx是Apache伺服器不錯的替代品。

二、niginx預設conf配置檔案：

#user  nobody; #nginx使用使用者
worker_processes  1;#設定值和CPU核心數一致

#日誌位置和日誌級別
#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;

　　#下面是server虛擬主機的配置
    server {
        listen       80; #監聽埠
        server_name  localhost; #域名

        #charset koi8
 
-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html; #站點目錄
            index  index.html index.htm;
        }

        #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;
    #    }
    #}

}

三、nginx下配置多個web工程：

詳情如下：（aa是請求介面）

1.web工程1：

• tomcat的訪問路徑：http://localhost:18880/aa
• nginx的訪問路徑：http://localhost:8888/first-path/aa

2.web工程1：

• tomcat的訪問路徑：http://localhost:18881/first-path/aa
• nginx的訪問路徑：http://localhost:8888/firstPath/aa

#關鍵配置如下
http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout  65;

    #web工程1
    upstream nana {
        server localhost:18880;
    }

    #web工程2
    upstream nananana {
        server localhost:18881;
    }
        
    server {
        listen       8888;
        server_name  localhost;

        location / {
            root   html;
            index  index.html index.htm;
        } 

        #web工程1    
        location ^~/first-path/ { 
            proxy_pass http://nana/;
            proxy_set_header X-real-ip $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_connect_timeout 5s;
        }

        #web工程2
        location /firstPath { 
            proxy_pass http://nananana/first-path;
            proxy_set_header X-real-ip $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_connect_timeout 5s;
        }
}