I have a local insecure Docker registry setup on a server for testing. I used the official docker tutorial for guidance. https://docs.docker.com/registry/deploying/
I understand how to configure, push, pull, etc. from the registry server. From my understanding the registry operates as a kind of key/value storage for images. Registry architecture looks like this. 
I haven't been able to find anything in the Docs or online that concerns removing images from the registry. Once an image is pushed, how can I remove it completely so that other docker instances can no longer pull that image from the registry? For instance, lets say I update some image. I want the servers to only pull the updated image without access to the older image.
Does anyone know how this is handled? I tried using docker exec to sh into the registry container and the manually deleting the image. I wasn't quite sure what to delete and this doesn't seem like the proper way. If I push an image to the registry with the same name as an existing image, will it override the existing image? Thank you for your replies.