I have put detailed solution description here   You should be able to start NiFi & its registry with this docker compose file. It persists several folders on the local disk & rest will be persisted in the docker volume called 'nifi_data' so that it retains the previous state of other folders like content_repository, database_repository, flowfile_repository, provenance_repository, state  and work. ... View more

Thanks for your help Matt. Due to restricted access to the site we ended up solving with a python script that monitors the Processor state via the Nifi API. Apologies I couldn't see this through to the end. ... View more