alias to server_ip/drupal

[gacek]

Hello,
i am rather new to the nginx and i have a trobule with alias from my default
page (http://server_IP/) to the Drupal (http://server_IP/drupal). I got the
error message: 404 Not Found. I have no idea what is wrong and i didn't find
anything with google either. Thanks for your help. These are my configs:

nginx.conf

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

events {
    worker_connections 1024;
}

http {
    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  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d
directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;
}
---------------------------------------------------------

default.conf

server {

    server_name  46.101.231.239;
    root   /usr/share/nginx/html;
    index index.php index.html index.htm;

    location / {
alias /drupal/;
  try_files $uri $uri/ =404;
}
    error_page 404 /404.html;
    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }

    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }
}
---------------------------------------------------------

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,267232,267232#msg-267232