Docker Cookbook - Second Edition

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Image tags group images of the same type. For example, CentOS can have images with tags such as centos6, centos7, and so on. To pull an image with a specific tag, for instance, run the following command:

    $ docker image pull centos:centos7

By default, the image with latest tag gets pulled. To pull all images corresponding to all tags, use the following command:

    $ docker image pull --all-tags alpine  

From Docker 1.6 (https://blog.docker.com/2015/04/docker-release-1-6/), we can build and refer to images by a new content addressable identifier called a digest. It is a very useful feature when we want to work with the specific images, rather than tags. To pull an image with a specific digest, we can use the following syntax: ...