docker images
- Docker & Kubernetes course
- Beginner
- Lesson 37/82
- 4 min
Learn to list local images with docker images.
docker images
docker images (or docker image ls) lists the images in the local store: repository, tag, ID, creation time and size. If a repository name is given, only its images are shown:
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
api 1.2.0 4f1e2d3c4b5a 2 hours ago 162MB
nginx alpine a5b6c7d8e9f0 3 weeks ago 48MB
<none> <none> 1a2b3c4d5e6f 3 hours ago 162MB
$ docker images nginxFiltering and format
As in docker ps, --filter and --format work here too. To find dangling images and show only the wanted columns:
docker images --filter dangling=true
docker images --format '{{.Repository}}:{{.Tag}} {{.Size}}'
docker images -q # only the IDsPractice Filter the image list
Write two commands: list the dangling images; then print all images in the {{.Repository}}:{{.Tag}} format.
Starter code
# buraya yazSample solution
docker images --filter dangling=true
docker images --format '{{.Repository}}:{{.Tag}}'Expected output
REPOSITORY TAG IMAGE ID CREATED SIZE <none> <none> 1a2b3c4d5e6f 3 hours ago 162MB api:1.2.0 nginx:alpine <none>:<none>
Questions and answers
Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.
1 What does an image shown as <none>:<none> mean?
- An image being downloaded
- A hidden image
- A dangling image whose tag moved to a newer build Correct answer
- A corrupt image
Explanation: Rebuilding with the same tag leaves the old image untagged.
2 Show only the dangling images.
Question
docker images --filter ____=true
Answer
docker images --filter dangling=trueExplanation: dangling=true selects untagged images.
3 Match.
| Term | Meaning |
|---|---|
docker images |
Local image list |
<none> |
Dangling image |
-q |
Only IDs |
SIZE |
Disk size |