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Project Atomic Host

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description Project Atomic Host Overview

Project Atomic Host provided a minimal, declarative Linux host operating system built around RPM packages, designed to simplify and standardize the deployment of containers using technologies like Docker and Kubernetes.

help Project Atomic Host FAQ

Is Project Atomic Host still actively maintained by Red Hat?

No, Project Atomic Host was officially retired in 2018, and its development was discontinued. Red Hat shifted its focus to its successor technologies, CoreOS and Fedora Silverblue.

How did Project Atomic Host handle operating system updates?

It utilized an atomic upgrade mechanism based on `rpm-ostree`, which treated the operating system as a series of immutable git-like trees. This allowed administrators to perform transactional updates and easily roll back to a previous state if a deployment failed.

Could you install standard RPM packages directly onto Project Atomic Host?

While the base OS was strictly managed, you could layer traditional RPM packages onto the system using `rpm-ostree install`. However, this required a system reboot for the new packages to take effect in the active deployment tree.

What container runtimes were natively supported by Project Atomic Host?

Project Atomic Host originally relied heavily on Docker to manage containers out of the box. In later iterations, it transitioned to favoring CRI-O alongside Kubernetes to provide a more lightweight, OCI-compliant runtime environment.

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