Docker Image commands

The following are the some of the Docker Image Commands that are widely used:

List Docker Images

docker images

Example:

$ docker ls

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
nginx               latest              0d9c6c5575f5        4 days ago          126MB
ubuntu              18.04               47b199b0cb85        2 weeks ago         64.2MB

Pull an Docker Image From a Registry

docker image pull <image-name>

Example:

$ docker pull alpine:3.11

3.11: Pulling from library/alpine
Digest: sha256:9f11a34ef1c67e073069f13b09fb76dc8f1a16f7067eebafc68a5049bb0a072f
Status: Downloaded newer image for alpine:3.11

Docker Images Prune

• The Docker Image Prune will remove the unused Docker Images that are not associated with any containers. The Command looks as follows:

docker image prune

Docker Images Filter

• When we want to filter some specific images we can filter out them using its labels or its meta information tags with the option –filter. The command looks as follows:

docker image ls -f "reference=mypython-app"

 Remove an Image from Docker

• The following command is used for removing the docker image from the local registry:

docker rmi <id-of-image>

Example:

$ docker rmi <image_id>

Untagged: <image_id>
Deleted: sha256:<image_id>

 Searching for a specific image on Docker Hub

docker search ubuntu

Example:

$ docker search ubuntu

NAME                             DESCRIPTION                                                          STARS                 OFFICIAL                          AUTOMATED

ubuntu                           Ubuntu is a Debian-based Linux operating s…                4458                    [OK]               

ubuntu-upstart              Upstart is an event-based replacement for …                  62                         [OK]               

tutum/ubuntu                 Simple Ubuntu docker images with ssh access             49                          [OK]               

ansible/ubuntu14.04-ansible

Docker Image is an executable package of software that includes everything needed to run an application. This image informs how a container should instantiate, determining which software components will run and how. Docker Container is a virtual environment that bundles application code with all the dependencies required to run the application. The application runs quickly and reliably from one computing environment to another.