Manage pods, containers, and container images.

This project is maintained by the containers organization.

podman logo

Pulling content directly from the Docker Daemon…

By Dan Walsh GitHub Twitter

Cool things you can do with Podman.

I recently received a bug report about some huge container images not working correctly in Docker. So I suggested to the reporter that they try them with Podman. He responded that he saw the images with docker images, but did not see them with podman images.

I explained to him that the Docker image and container database are separate from the Podman image and container database. I told him he would have to pull the images into Podman. Then I decided to try a cool feature of Podman, where I could pull images directly out of the Docker daemon.

First I look for the Centos Image inside of Docker.

# docker images | grep centos
docker.io/centos                  	7               	49f7960eb7e4    	2 months ago    	200 MB

Podman has the ability through its use of containers/image to pull images using many different transports other than just pulling from Container Registries. It supports pulling directly from the Docker daemon, using the docker-daemon transport.

# podman pull docker-daemon:docker.io/centos:7
Getting image source signatures
Copying blob sha256:bcc97fbfc9e1a709f0eb78c1da59caeb65f43dc32cd5deeb12b8c1784e5b8237
 198.59 MB / 198.59 MB [====================================================] 1s
Copying config sha256:49f7960eb7e4cb46f1a02c1f8174c6fac07ebf1eb6d8deffbcb5c695f1c9edd5
 2.15 KB / 2.15 KB [========================================================] 0s
Writing manifest to image destination
Storing signatures

Now you have the Centos 7 image in Podman containers/storage datastore.

#podman images | grep centos
docker.io/library/centos        	7    	49f7960eb7e4   2 months ago   .com208MB

Now you can start using the image with Podman, Buildah and CRI-O. You can even create new images and push them back into the Docker daemon.

Try it out…