Chapter 2. Working with tags

A new tag can be added to a tagged image by clicking on the gear icon next to the tag and choosing Add New Tag. Quay.io will confirm the addition of the new tag to the image.

Moving a tag to a different image is accomplished by performing the same operation as adding a new tag, but giving an existing tag name. Quay.io will confirm that you want the tag moved, rather than added.

A specific tag and all its images can be deleted by clicking on the tag’s gear icon and choosing Delete Tag. This will delete the tag and any images unique to it. Images will not be deleted until no tag references them either directly or indirectly through a parent child relationship.

From the Tags tab, you can view different ways of pulling images from the clients that are ready to use those images.

You can select to pull a regular of an image by tag name or by digest name using the docker command. You can pull a squashed version of the image with docker by selecting Squashed Docker Image. There is also an example for pulling the image using the rkt command. . Choose the type of pull you want, then select Copy Command. The full command-line is copied into your clipboard. These two commands show a docker pull by tag and by digest:

docker pull quay.io/cnegus/whatever:latest
docker pull quay.io/cnegus/whatever@sha256:e02231a6aa8ba7f5da3859a359f99d77e371cb47e643ce78e101958782581fb9

docker pull quay.io/cnegus/whatever:latest
docker pull quay.io/cnegus/whatever@sha256:e02231a6aa8ba7f5da3859a359f99d77e371cb47e643ce78e101958782581fb9

Paste the command into a command-line shell on a system that has the docker command and service available, and press Enter. At this point, the container image is ready to run on your local system.

On most Red Hat systems, you can substitute podman for docker to pull and run the selected image.