Proxy Pass To Dynamic DNS

[Geezer]

I am using apache24 as a proxy (amongst other stuff) using:

<VirtualHost public.domain.name xx.xx.xx.xx:80>
    ProxyPass / http://dynamic.domain.name:8800/
    ProxyPassReverse / http://dynamic.domain.name:8800/
</VirtualHost>

This works very well, except dynamic.domain.name is used for a domestic machine, is dynamic and the IP address changes once or twice a day.

When the IP changes, then apache gives a 503 error when connecting to public.domain.name.

I can clear this by service apache24 restart/ reload/ graceful, but I want this to be automated.

For the time being, I can do this with a crontab that drills dynamic.domain.name and if it changes then do the service apache24 graceful, but it is not an elegant solution.

Is there anything better? Is there anything within apache that will recognise when dynamic.domain.name changes?

 

[covacat]

you can use a "program" rewrite map which can return the valid ip
then something like this

        RewriteEngine On
        RewriteMap d2u "prg:/var/www/html/whatever.sh"
        RewriteRule .* - [E=ZPROXY:${d2u:%{HTTP_HOST}|dynamic.domain.name}]
        ProxyPreserveHost On
        ProxyPassInterpolateEnv On
        ProxyPassReverse / https://${ZPROXY}:443/ interpolate
        ProxyPass / https://${ZPROXY}:443/ interpolate