Sim. Você deseja usar hooks
para isso, conforme descrito nos documentos :
In order to allow customisation of operations, Ganeti runs scripts in sub-directories of @SYSCONFDIR@/ganeti/hooks. These sub-directories are named $hook-$phase.d, where $phase is either pre or post and $hook matches the directory name given for a hook (e.g. cluster-verify-post.d or node-add-pre.d).
This is similar to the /etc/network/ structure present in Debian for network interface handling.
(Se você tiver problemas específicos ou precisar de ajuda adicional, informe-nos, fico feliz em ajudar.)