Use X-Forwarded-For in Apache logs

[LiFiCode]

The client IP in nominatim-docker / Apache logs is not informative

The Apache logs now only show 172.17.0.1 or whatever docker network the container is attached to.
This only tells you that something made a request...

Describe the solution you'd like

It would be helpful to see the actual IP of the client request.

Solution (as long as the docker image is not updated)

If you like to see actual IP addresses of clients querying nominatim you can do following steps.
Make sure your proxy server sends the right header - in this case X-Forwarded-For...

1. enter the nominatim docker container

docker exec -ti nominatim /bin/bash

2. install text editor - in this case nano

apt install nano

3. enable the apache remoteip mod

a2enmod remoteip

4. edit the apache config file

nano /etc/apache2/apache2.conf

# change
# LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
# to
# LogFormat "%a %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined

that's %a instead of %h

5. create the apache mod remoteip config file

nano /etc/apache2/conf-available/remoteip.conf

# add
# RemoteIPHeader X-Forwarded-For
# RemoteIPTrustedProxy 172.17.0.1/32

use whatever header your proxy server sends - here it is X-Forwarded-For
use whatever IP is shown in the logs now - here it is 172.17.0.1

6. enable the apache mod remoteip by linking the config into /etc/apache2/conf-enabled

ln -s /etc/apache2/conf-available/remoteip.conf /etc/apache2/conf-enabled/remoteip.conf

7. check apache config for syntax errors

apache2ctl configtest

it should say Syntax OK

8. restart apache for changes to take effect

service apache2 restart

9. exit the container

exit

Now your logs should include the real IP from the client making the request.

Thanks to the nominatim people for their great work!