Troubleshooting

Why is the GeoIP2 module not working?

If the GeoIP2 module is not functioning, it is likely due to the module not being loaded. Since GeoIP2 is a dynamic module, it must be explicitly loaded in the NGINX configuration.

To fix this, ensure that the module is loaded at the top of your nginx.conf file. Add the following line:

load_module modules/ngx_http_geoip2_module.so;

If you are using the stream module, add:

load_module modules/ngx_stream_geoip2_module.so;

Verify the presence of the .so files in the /etc/nginx/modules/ directory.

Why does $geoip2_data_country_code return an empty value?

An empty value for $geoip2_data_country_code may indicate that the GeoIP2 database file is not correctly specified or accessible.

Ensure that the geoip2 directive in your configuration points to a valid and accessible MaxMind database file. Example configuration:

http {
    geoip2 /etc/nginx/geoip2/GeoLite2-Country.mmdb {
        $geoip2_data_country_code country iso_code;
    }
}

Check the file path and permissions to ensure the NGINX worker process can read the database file.

Why is regex performance slow with GeoIP2 variables?

Using regex with GeoIP2 variables can impact performance, especially if PCRE JIT is not enabled.

Enable PCRE JIT in your nginx.conf to improve regex performance:

pcre_jit on;

Place this directive in the main context, outside of any http, server, or location blocks.

Why are client hints not respected in GeoIP2 lookups?

Client hints might not be respected if the geoip2_proxy directive is not properly configured to handle forwarded headers.

Ensure that the geoip2_proxy directive is correctly set with the CIDR of trusted proxies, and enable recursive searching if necessary:

http {
    geoip2_proxy 192.168.1.0/24;
    geoip2_proxy_recursive on;
}

This configuration allows the module to use the X-Forwarded-For header for client IP lookups from trusted proxies.

Why does $is_mobile return 1 for tablets?

The GeoIP2 module may classify tablets as mobile devices, leading to $is_mobile returning 1 for tablets.

To address this, consider using a more granular device detection mechanism or a separate database that distinguishes between mobile phones and tablets. Adjust your logic to handle tablets if necessary, as the GeoIP2 database might not differentiate them by default.