Docker: How to find the dependent child images?

Docker-find-dependent-child-image.md

Find the dependent child images on Docker

When you try to remove the docker image with the following command

docker rmi 6795374be8c1

Sometimes you might be facing below error:

Error response from daemon: conflict: unable to delete 6795374be8c1 (cannot be forced) - image has dependent child images

Below is the Docker command line used to find the dependent child images

Format:

docker inspect --format='{{.Id}} {{.Parent}}' $(docker images --filter since= -q)

Example:

docker inspect --format='{{.Id}} {{.Parent}}' $(docker images --filter since=6795374be8c1 -q)

Result:

sha256:1d1f94c972fc8d75a34135f9ff551617680c508f7ad17efda09048b4e805g1w3

Here sha256:1d1f94c972fc8d75a34135f9ff551617680c508f7ad17efda09048b4e805g1w3, the bold value is your dependent child image

➜  ~ docker image ls -a
REPOSITORY               TAG                 IMAGE ID            CREATED             SIZE
yogimaker                latest              9e26907ab97c        2 days ago          1.59GB
<none>                   <none>              1334b5f7a1c8        2 days ago          1.55GB
as                       latest              46fd53ef8b95        2 days ago          1.54GB
kalilinux/kali-rolling   latest              14da2d1801b5        7 days ago          114MB
tensorflow/tensorflow    latest              539d0e818045        5 weeks ago         1.54GB
hello-world              latest              bf756fb1ae65        8 months ago        13.3kB
➜  ~ docker inspect --format='{{.Id}} {{.Parent}}' $(docker images --filter since=46fd53ef8b95 -q)
sha256:9e26907ab97cb6aa43fbbcd9d48c8631810af77971fe2e2e843b646a1c7ca4de sha256:1334b5f7a1c8aaa4c10dc3c7792f419776a667e29abbd0134732e92ad26d799d
➜  ~ 

so when i added new feature for example upgrade version of application like pip
before my pip version example 1
then i upgrade to version example 4
this always make new container and new image .
so this normal for docker ? and consume memory ??? or how to manag ?

i want to delete image what i dont use, but the image have child where the child image is use...

docker inspect --format='{{.Id}} {{.Parent}}' $(docker images --filter since=6795374be8c1 -q)
This will also return not dependent images, but that were created since specified one was. You have to additionally filter with parent id like here.