我正在使用Nginx bitnami codeigniter服务器。

在根文件夹中已存在现有codeigniter项目的情况下，现在有必要将新应用程序添加到子文件夹中。 在apache中，只需创建一个子文件夹并将codeigniter复制到其中，但在nginx中，它继续作为root应用程序连接，将子文件夹视为控制器，并发生404错误。 我应该如何设置？

这是我的Bitnami配置文件。

server { 
    listen       80; 
    server_name  localhost; 
    include "/opt/bitnami/nginx/conf/bitnami/phpfastcgi.conf"; 
    include "/opt/bitnami/nginx/conf/bitnami/bitnami-apps-prefix.conf"; 
     ## Root and index files. 
    root /opt/bitnami/nginx/html; 
    index  index.php index.html index.htm; 
    ## If no favicon exists return a 204 (no content error). 
    location = /favicon.ico { 
        try_files $uri =204; 
        log_not_found off; 
        access_log off; 
    } 
    ## Don't log robots.txt requests. 
    location = /robots.txt { 
        allow all; 
        log_not_found off; 
        access_log off; 
    } 
    ## Try the requested URI as files before handling it to PHP. 
    location / { 
        proxy_buffers 8 1024k; 
        proxy_buffer_size 1024k; 
        ## Regular PHP processing. 
        location ~ \.php$ { 
            try_files  $uri =404; 
            #fastcgi_pass   php_processes; 
            fastcgi_pass unix:/opt/bitnami/php/var/run/www.sock; 
            fastcgi_index  index.php; 
            fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name; 
            include        fastcgi_params; 
        } 
        ## Static files 
        location ~* \.(?:css|gif|htc|ico|js|jpe?g|png|swf)$ { 
            expires max; 
            log_not_found off; 
            ## No need to bleed constant updates. Send the all shebang in one 
            ## fell swoop. 
            tcp_nodelay off; 
            ## Set the OS file cache. 
            open_file_cache max=1000 inactive=120s; 
            open_file_cache_valid 45s; 
            open_file_cache_min_uses 2; 
            open_file_cache_errors off; 
        } 
        ## Keep a tab on the 'big' static files. 
        location ~* ^.+\.(?:ogg|pdf|pptx?)$ { 
            expires 30d; 
            ## No need to bleed constant updates. Send the all shebang in one 
            ## fell swoop. 
            tcp_nodelay off; 
        } 
    } # / location 
    if (!-e $request_filename ) { 
          rewrite ^(.*)$ /index.php last; 
    } 
}

并且此代码将所有路径重定向到indx.php。

if (!-e $request_filename ) { 
          rewrite ^(.*)$ /index.php last; 
    }

谢谢。