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When I run the docker-compose build command to rebuild an image in Docker because I had changed something in Dockerfile, sometimes I get "none" image tags. How can we avoid this fact? I want to rebuild the image but the none image should not appear.
REPOSITORY TAG IMAGE ID CREATED SIZE magento2 latest b4dce4dcbd4f 16 hours ago 516MB <none> <none> b4ffce2bf91e 16 hours ago 519MB <none> <none> a1aedb60c82a 17 hours ago 516MB <none> <none> ec9a14ae856c 20 hours ago 519MB <none> <none> ef8eba6874cc 23 hours ago 516MB <none> <none> 0e53a8b8c303 23 hours ago 516MB php 7.1-apache 93e6fb4b13e1 3 weeks ago 369MB mysql 5.6.39 079344ce5ebd 7 months ago 256MB 
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The Bad <none>:<none>These images are the dangling ones, which can cause disk space problems. These <none>:<none> images are being listed as part of docker images and need to be pruned.
When you build your images add “–rm” this should help with removing any intermediate and none images. [quote]When you build your images add “–rm” this should help with removing any intermediate and none images.
docker image prune removes all dangling images (those with tag none). docker image prune -a would also remove any images that have no container that uses them.
Images can exist without containers, whereas a container needs to run an image to exist. Therefore, containers are dependent on images and use them to construct a run-time environment and run an application. The two concepts exist as essential components (or rather phases) in the process of running a Docker container.
It seems as though this <none> problem also occurs when you try to name your image with something containing a capital letter. For example I built an image with docker build -t myname/NewImage:0.1 . and this resulted in my image having a repo and tag of <none>. You built an image with docker build -t myname/NewImage:0.1 . more than one time.
When you run docker image list it'll show repo/stuff as the repository and tag as the TAG Most of the times what I have observed is, this happens when we don't provide a tag name while building an image so if we run only docker build . , it vl create image with <none> as showed below:
Since all these <none>:<none> images can be quite confusing as what they signify. These images are the dangling ones, which can cause disk space problems. These <none>:<none> images are being listed as part of docker images and need to be pruned.
These images are the dangling ones, which can cause disk space problems. These <none>:<none> images are being listed as part of docker images and need to be pruned. (a dangling file system layer in Docker is something that is unused and is not being referenced by any images.
Below are some parts from What are Docker <none>:<none> images?
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. Since all these<none>:<none>images can be quite confusing as what they signify.The Bad
<none>:<none>These images are the dangling ones, which can cause disk space problems. These
<none>:<none>images are being listed as part ofdocker imagesand need to be pruned.(a dangling file system layer in Docker is something that is unused and is not being referenced by any images. Hence we need a mechanism for Docker to clear these dangling images)
if your case has to do with dangling images, it's ok to remove them with:
docker rmi $(docker images -f "dangling=true" -q) There is also the option of docker image prune but the client and daemon API must both be at least v1.25 to use this command.
if your case has to do with intermediate images, it's ok to keep them, other images are pointing references to them.
Related documentation:
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In my experience most of the <none> images are held by temporary containers. Due to Docker architecture those containers are preserved even after they stop. You can verify how many stopped containers you have using
docker ps -a So to remove the <none> images you first need to remove the unneeded containers:
docker container prune docker image prune The above two commands can be abbreviated to
docker system prune If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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