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This is what docker images shows before I run docker build.
$ docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE myapp latest a38da0bd9e0b 6 seconds ago 523.8 MB golang onbuild b4997c557048 10 days ago 517.2 MB After I make some changes to the myapp source code, I run docker build -t myapp . and I end up with images named <none>.
$ docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE myapp latest a38da0bd9e0b Less than a second ago ago 523.8 MB <none> <none> e4209f97e819 10 minutes ago 523.8 MB golang onbuild b4997c557048 10 days ago 517.2 MB I know I can remove them with docker rmi <IMAGE ID>, but why does that happen in the first place? How can I prevent that from happening? The Dockerfile I'm building looks like this.
FROM golang:onbuild EXPOSE 8080 
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Docker provides the support for storing the images on the Docker Hub repository. A Docker tag provides a unique identity to a Docker image. There are sets of similar images with different versions identified by tags in a Docker repository. Here, we'll learn to tag an image using the docker build and docker tag command.
Docker Hub repositories allow you share container images with your team, customers, or the Docker community at large. Docker images are pushed to Docker Hub through the docker push command. A single Docker Hub repository can hold many Docker images (stored as tags).
The Good <none>:<none> These are intermediate images and can be seen using docker images -a . They don't result into a disk space problem but it is definitely a screen "real estate" problem.
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.
If you reassign a tag or image name to another image, your image will lose its tag or name. It's really that simple. Your myapp repo image tagged latest with ID a38da0bd9e0b used to be named and tagged on image ID e4209f97e819.
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