This video is about changing a worker node to a gateway node and changing a gateway node to a worker node. You can make changes at the command line as well as in the Administrator console. It is fun and easy!
How to unassign services from an expired key and assign them to a valid key in 9.1.0 and 9.5.1
How to find in which host the Repository Integration service is running in a multi node domain
Converting and adding of a self signed certificate to use a Webservice Consumer transformation