Docker Images¶

Image registry¶

On Docker Hub¶

Official Images maintained by docker
Verified Images maintained by third party providers
User Images maintained by users

Image Tags¶

List Images on docker hosts¶

docker image ls

docker images

Search Images on Default registry¶

docker search <keyword>

:::info By default, it displays 25 images :::

To specify limit of images to search¶

docker search --limit 5

:::info --limit can be upto 100 (Max) :::

Search official images¶

docker search --filter is-official=true httpd

Get images¶

docker pull image-name

or

docker pull image-url

Writing Image name¶

Image-name follows the pattern

Registry-URL/account-name/image-name

If registry URL is not supplied, then default URL is considered that is https://registry-1.docker.io

If account name is not specified, then image name is considered as account name

Example:¶

if image name provided as httpd then this will be considered as registry-1.docker.io/httpd/https

Public and Private registry¶

Public registry does not required credentials

Private registry required login

docker login registry.url

Removing Images¶

docker image rm image-name

Remove all unused images¶

docker image prune -a

Inspecting docker image¶

docker image inspect

check layers of docker images¶

docker image history image-name

Save and load Images¶

Downloading docker images or saving docker images¶

docker image save image-name -o image-name.tar

Loading the image¶

docker image load -i image-name.tar

Convert container to image¶

docker export container-name > testimage.tar

Using this converted image to run a container on any docker host¶

docker image import image-name.tar container-name

:::info - docker image load is different from docker image import
If we have used docker save to create image then docker image load will work as it requires docker metadata to be included in it and this is done by docker image save. - If we have any other image not created by docker save then docker image import needs to be used :::