Sorry to revive an old thread, but just in case anyone else comes across this topic (as I'm was also trying to work this out today in UNRAID > Docker area). Provided you already have docker enabled and some docker containers installed, go to Docker tab (top menu bar of UNRAID) > click on the name of the docker container you want to add a health check parameter for > this should open the containers config settings > in the top right hand corner (along the 'update container' heading) click the 'Basic View' toggle to switch to 'Advanced View' > You will now see additional fields, one of which is 'Extra Parameters:'). Put your health check command and it's parameters in there.