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Why does Docker only allow lowercase letters for image names?
Why not uppercase letters?
During the commit of a container:
docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]
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A tag name must be valid ASCII and may contain lowercase and uppercase letters, digits, underscores, periods and dashes. A tag name may not start with a period or a dash and may contain a maximum of 128 characters.
You can rename your docker image by docker tag command. Use the below given command to do that. To rename docker container, use the rename sub-command as shown, in the following example, we renaming the container discourse_app to a new name disc_app.
Smaller Docker images take up less disk space. A Docker image is composed of reusable layers, i.e. different images might share some layers. Because of such architecture, image size and disk consumption are not necessarily directly correlated.
This was a design choice; technically, there should probably be no real issues with allowing mixed-case names, but we decided to stick with lowercase for now (which keeps the road open to allow uppercase characters in future, without breaking backward compatibility).
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