Podman: A tool for managing OCI containers and pods

Podman (the POD MANager) is a tool for managing containers and images, volumes mounted into those containers, and pods made from groups of containers. Podman runs containers on Linux, but can also be used on Mac and Windows systems using a Podman-managed virtual machine. Podman is based on libpod, a library for container lifecycle management that is also contained in this repository. The libpod library provides APIs for managing containers, pods, container images, and volumes.

Podman releases a new major or minor release 4 times a year, during the second week of February, May, August, and November. Patch releases are more frequent and may occur at any time to get bugfixes out to users. All releases are PGP signed. Public keys of members of the team approved to make releases are located here.

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Overview and scope

At a high level, the scope of Podman and libpod is the following:

• Support for multiple container image formats, including OCI and Docker images.
• Full management of those images, including pulling from various sources (including trust and verification), creating (built via Containerfile or Dockerfile or committed from a container), and pushing to registries and other storage backends.
• Full management of container lifecycle, including creation (both from an image and from an exploded root filesystem), running, checkpointing and restoring (via CRIU), and removal.
• Full management of container networking, using Netavark.
• Support for pods, groups of containers that share resources and are managed together.
• Support for running containers and pods without root or other elevated privileges.
• Resource isolation of containers and pods.
• Support for a Docker-compatible CLI interface, which can both run containers locally and on remote systems.
• No manager daemon, for improved security and lower resource utilization at idle.
• Support for a REST API providing both a Docker-compatible interface and an improved interface exposing advanced Podman functionality.
• Support for running on Windows and Mac via virtual machines run by podman machine.

Roadmap

The future of Podman feature development can be found in its roadmap.

Communications

If you think you've identified a security issue in the project, please DO NOT report the issue publicly via the GitHub issue tracker, mailing list, or IRC. Instead, send an email with as many details as possible to security@lists.podman.io. This is a private mailing list for the core maintainers.

For general questions and discussion, please use Podman's channels.

For discussions around issues/bugs and features, you can use the GitHub issues and PRs tracking system.

There is also a mailing list at lists.podman.io. You can subscribe by sending a message to podman-join@lists.podman.io with the subject subscribe.

Community Meetings

All Podman meetings are open to everyone, free to attend, and hosted via Zoom through the CNCF/Linux Foundation. The full calendar is available on the Podman Container Tools LFX Meetings page. Registering for a meeting sends you an invite for that meeting and all subsequent recurring instances.

Meeting	Schedule	Format
Podman Community Meeting and its agenda	First Tuesday of even-numbered months (Feb, Apr, Jun, Aug, Oct, Dec) at 11:00 a.m. Eastern (UTC-4 summer / UTC-5 winter)	~1 hour — demos, announcements, and community updates
Podman Monday Office Hours and its agenda	Every Monday at 10:00 a.m. Eastern (UTC-4 summer / UTC-5 winter)	30 min — technical discussions, open topics
Podman Thursday Office Hours and its agenda	Every Thursday at 11:00 a.m. Eastern (UTC-4 summer / UTC-5 winter)	30 min — technical discussions, open topics

Rootless

Podman can be easily run as a normal user, without requiring a setuid binary. When run without root, Podman containers use user namespaces to set root in the container to the user running Podman. Rootless Podman runs locked-down containers with no privileges that the user running the container does not have. Some of these restrictions can be lifted (via --privileged, for example), but rootless containers will never have more privileges than the user that launched them. If you run Podman as your user and mount in /etc/passwd from the host, you still won't be able to change it, since your user doesn't have permission to do so.

Almost all normal Podman functionality is available, though there are some shortcomings. Any recent Podman release should be able to run rootless without any additional configuration, though your operating system may require some additional configuration detailed in the install guide.

A little configuration by an administrator is required before rootless Podman can be used, the necessary setup is documented here.

Podman Desktop

Podman Desktop provides a local development environment for Podman and Kubernetes on Linux, Windows, and Mac machines. It is a full-featured desktop UI frontend for Podman which uses the podman machine backend on non-Linux operating systems to run containers. It supports full container lifecycle management (building, pulling, and pushing images, creating and managing containers, creating and managing pods, and working with Kubernetes YAML). The project develops on GitHub and contributions are welcome.

Out of scope

• Specialized signing and pushing of images to various storage backends. See Skopeo for those tasks.
• Support for the Kubernetes CRI interface for container management. The CRI-O daemon specializes in that.

OCI Projects Plans

Podman uses OCI projects and best of breed libraries for different aspects:

• Runtime: We use the OCI runtime tools to generate OCI runtime configurations that can be used with any OCI-compliant runtime, like crun and runc.
• Images: Image management uses the containers/image library.
• Storage: Container and image storage is managed by containers/storage.
• Networking: Networking support through use of Netavark and Aardvark. Rootless networking is handled via pasta.
• Builds: Builds are supported via Buildah.
• Conmon: Conmon is a tool for monitoring OCI runtimes, used by both Podman and CRI-O.
• Seccomp: A unified Seccomp policy for Podman, Buildah, and CRI-O.

Podman Information for Developers

For blogs, release announcements and more, please checkout the podman.io website!

Installation notes Information on how to install Podman in your environment.

OCI Hooks Support Information on how Podman configures OCI Hooks to run when launching a container.

Podman API Documentation on the Podman REST API.

Podman Commands A list of the Podman commands with links to their man pages and in many cases videos showing the commands in use.

Podman Container Images Information on the Podman Container Images found on quay.io.

Podman Troubleshooting Guide A list of common issues and solutions for Podman.

Podman Usage Transfer Useful information for ops and dev transfer as it relates to infrastructure that utilizes Podman. This page includes tables showing Docker commands and their Podman equivalent commands.

Tutorials Tutorials on using Podman.

Remote Client A brief how-to on using the Podman remote client.

Basic Setup and Use of Podman in a Rootless environment A tutorial showing the setup and configuration necessary to run Rootless Podman.

Release Notes Release notes for recent Podman versions.

Contributing Information about contributing to this project.

Buildah and Podman relationship

Buildah and Podman are two complementary open-source projects that are available on most Linux platforms and both projects reside at GitHub.com with Buildah here and Podman here. Both, Buildah and Podman are command line tools that work on Open Container Initiative (OCI) images and containers. The two projects differentiate in their specialization.

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