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IP Geo blocking

Qool restricts access to the Netherlands using NGINX GeoIP2.

1. Install the NGINX GeoIP2 module

sudo apt update
sudo apt install libnginx-mod-http-geoip2

Ubuntu should automatically create:

/etc/nginx/modules-enabled/50-mod-http-geoip2.conf

With the contents:

load_module modules/ngx_http_geoip2_module.so;

2. Download the country database

DB-IP publishes its free country database monthly in MMDB format. Select the current release from the official DB-IP download page. The free database requires attribution under CC BY 4.0.

For the November 2026 release:

cd /tmp

curl -fL \
  https://download.db-ip.com/free/dbip-country-lite-2026-11.mmdb.gz \
  -o dbip-country-lite.mmdb.gz

gzip -dc dbip-country-lite.mmdb.gz \
  > dbip-country-lite.mmdb

sudo install -d -o root -g root -m 0755 /usr/share/GeoIP

sudo install -o root -g root -m 0644 \
  dbip-country-lite.mmdb \
  /usr/share/GeoIP/dbip-country-lite.mmdb

DB-IP documents that Lite databases are updated monthly, so the YYYY-MM value must periodically be updated. DB-IP documentation

3. Define the country policy

Create /etc/nginx/conf.d/nl-country-map.conf:

geoip2 /usr/share/GeoIP/dbip-country-lite.mmdb {
    auto_reload 1h;
    $visitor_country_code default=ZZ country iso_code;
}

map $remote_addr $trusted_ip {
    default 0;

    # Replace this with your own trusted public IP.
    203.0.113.10 1;
}

map "$visitor_country_code:$trusted_ip" $country_allowed {
    default 0;

    # Allow clients classified as Dutch.
    ~^NL: 1;

    # Allow explicitly trusted source addresses.
    ~:1$ 1;
}

4. Create the enforcement snippet

Create /etc/nginx/snippets/nl-some-countries-only.conf:

# Reusable Netherlands-only access policy.
# Requires $nl_country_allowed in the HTTP context.
if ($country_allowed = 0) {
    return 403;
}

Using if with a simple return is appropriate here.

5. Enable it for a website

Inside the applicable server block:

server {
    listen 443 ssl;
    server_name example.com;

    include snippets/nl-some-countries-only.conf;

    # Remaining website configuration...
}

6. Test before reloading

sudo nginx -t

Only when that succeeds:

sudo systemctl reload nginx

Test from:

  • A Dutch connection, which should receive the normal website.
  • A non-Dutch VPN endpoint, which should receive HTTP 403.
  • Your trusted IP, which should work regardless of its GeoIP classification.

You can inspect NGINX’s effective configuration with:

sudo nginx -T

Important considerations

  • If NGINX is behind Cloudflare, another reverse proxy, or a load balancer, $remote_addr may be the proxy address. Configure NGINX’s real-IP module correctly before applying this restriction. Do not blindly trust client-supplied forwarding headers.
  • A server-level restriction can also block Let’s Encrypt HTTP-01 validation. If Certbot uses HTTP-01, provide a separate unrestricted ACME challenge virtual host/location or use DNS-01 validation.
  • GeoIP is not an absolute security boundary. VPNs, proxies, database inaccuracies, and stale records can bypass or incorrectly trigger it.
  • The qool server currently has no detected automatic database updater. A monthly replacement of the MMDB file should therefore be scheduled if you want current classifications.
  • SSH access is unaffected; this configuration only restricts websites served through the applicable NGINX virtual host.

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