How To Install Podman on Ubuntu 22.04|20.04|18.04

How to install Podman on Ubuntu?. Podman (Pod Manager) is a tool used to create and maintain containers. It is part of the libpod library. The Red Hat team has been working on a set of tools for running containers without a daemon. Did you know you can’t run Docker containers without Docker Engine daemon?.

The following set of tools work together to power the use of Containers without an all-time running daemon process.

• Buildah to facilitate building of OCI images
• Skopeo for sharing/finding container images on Docker registries, the Atomic registry, private registries, local directories and local OCI-layout directories.
• Podman for running containers without need for daemon.

Buildah’s commands replicate all of the commands that are found in a Dockerfile. Buildah containers are just created to allow content to be added back to the container image.

• How To Build OCI & Docker Container Images With Buildah

Podman gives you all the commands and functions required to maintain and modify OCI images, such as pulling and tagging. It also allows you to create, run, and maintain containers created from those images.

Install Podman on Ubuntu 22.04|20.04|18.04

The podman package is on a PPA repository which needs to be added prior to installation. Start a new terminal session on your Ubuntu machine and run commands below.

Install Podman on Ubuntu 22.04

On Ubuntu 22.04 you can install Podman from the OS default APT repositories as it contains the package:

sudo apt update

sudo apt install podman

Install Podman on Ubuntu 20.04 / Ubuntu 18.04

Add Kubic project repository to your Ubuntu 20.04|18.04 system:

. /etc/os-release

echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_$VERSION_ID/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list

curl -L "https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_$VERSION_ID/Release.key" | sudo apt-key add -

Once the repository is added, proceed to install Podman.

sudo apt update

sudo apt -y install podman

After the installation, you can display information pertaining to the host, current storage stats, and build of podman.

$ podman  --version

podman version 3.4.2



$ podman  info

Test Podman on Ubuntu 22.04|20.04|18.04

Pull Alpine docker image.

$ podman pull alpine

Trying to pull docker.io/library/alpine…Getting image source signatures

Copying blob 8e402f1a9c57: 2.63 MiB / 2.63 MiB [=======================] 5s

Copying config 5cb3aa00f899: 1.48 KiB / 1.48 KiB [=====================] 0s

Writing manifest to image destination

Storing signatures

5cb3aa00f89934411ffba5c063a9bc98ace875d8f92e77d0029543d9f2ef4ad0

List Downloaded images

$ podman  images

REPOSITORY                      TAG      IMAGE ID       CREATED        SIZE

docker.io/library/alpine        latest   5cb3aa00f899   3 days ago     5.79 MB

docker.io/library/hello-world   latest   fce289e99eb9   2 months ago   5.62 kB

Podman’s local repository is in /var/lib/containers

Run container with command – command options similar to docker.

$ podman  run -it  --rm docker.io/library/alpine /bin/sh

/ # apk update

fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/main/x86_64/APKINDEX.tar.gz

fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/community/x86_64/APKINDEX.tar.gz

v3.9.2-1-g592d872fb8 [http://dl-cdn.alpinelinux.org/alpine/v3.9/main]

v3.9.2-2-ge7dc3349a9 [http://dl-cdn.alpinelinux.org/alpine/v3.9/community]

OK: 9754 distinct packages available



/ # apk add vim

 (1/5) Installing lua5.3-libs (5.3.5-r1)

 (2/5) Installing ncurses-terminfo-base (6.1_p20190105-r0)

 (3/5) Installing ncurses-terminfo (6.1_p20190105-r0)

 (4/5) Installing ncurses-libs (6.1_p20190105-r0)

 (5/5) Installing vim (8.1.0630-r0)

 Executing busybox-1.29.3-r10.trigger

 OK: 40 MiB in 19 packages

 / # exit

Show running containers.

$ podman ps

CONTAINER ID  IMAGE                            COMMAND  CREATED        STATUS            PORTS  NAMES

1eb35f1b7de8  docker.io/library/alpine:latest  /bin/sh  4 seconds ago  Up 4 seconds ago         pedantic_roentgen

ec9c5b12db46  docker.io/library/alpine:latest  /bin/sh  5 minutes ago  Up 5 minutes ago         ecstatic_wiles

For more on usage, check:

• How To run Docker Containers using Podman and Libpod

To setup private registry, checkout:

• Setup Docker Container Registry with Podman & Let’s Encrypt SSL

Conclusion

Podman seems to be a replacement for Docker and other container management tools which require a daemon to work. It is still fresh and in early development stages to tell a lot. In RHEL 8, the officially supported tools for managing Docker containers are Podman and Buildah.

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