Docker build command with --tag unable to tag images

docker dockerfile docker-build
Harshil picture Harshil · Aug 5, 2016 · Viewed 16.9k times · Source

I have trying to build a Docker image using a Dockerfile available locally.

docker build -t newimage .

I have used this command multiple times earlier too, but somehow its not working currently and i am stuck finding the reason for it.

I will be really helpful if someone can help me with a possible solution or a possible area to look for an issue.

i already had a look over other posts that could have been related for example : Docker build tag repository name

Answer

Harshil picture Harshil · Aug 6, 2016

Okay! I found out the reason for issue.

DOCKER BUILD PROCESS

When we build a docker image, while creating a image several other intermediate images are generated in the process. We never see them in docker images because with the generation of next intermediate image the earlier image is removed.And in the end we have only one which is the final image.

The tag we provide using -t or --tag is for the final build, and obviously no intermediate container is tagged with the same.

ISSUE EXPLANATION

When we try to build a docker image with Dockerfile sometimes the process is not successfully completed with a similar message like Successfully built image with IMAGEID

So it is so obvious that the build which has failed will not be listed in docker images

Now, the image with tag <none> is some other image (intermediate). This creates a confusion that the image exists but without a tag, but the image is actually not what the final build should be, hence not tagged.

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