How to duplicate docker image with a new tag?

Question

Let's say I have an image with tag :latest.
I'd like to duplicate the image on my PC and then give it another tag like :1.4.2

I do not want to build the image, just copy and retag it.

Answer 1

I occasionally need to clone docker images that clients are using as a backup when they want to try a new version. This provides them the option of easily reverting if needed.

assuming your image is called best-ui and has the tag latest we will clone this with the tag old

docker tag best-ui:latest best-ui:old

now run docker images and you will see the new cloned image with the new tag