Building the Next Generation Container OS

Use immutable infrastructure to deploy and scale your containerized applications. Project Atomic builds OSes, tools, and containers for cloud native platforms.

Buildah, a different way to build containers, is now available for testing.

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Atomic Host

Atomic Host provides "immutable infrastructure" for deploying to hundreds or thousands of servers in your private or public cloud. Available in Fedora Atomic Host, CentOS Atomic Host, and Red Hat Atomic Host editions depending on your platform and support needs.

To balance the need between long-term stability and new features, we are providing different releases of Atomic Host for you to choose from.

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Container Registries

You can get your containerized applications from the CentOS Container Pipeline and the Fedora Layered Image Build Service

Trusted container content from the projects you already trust.

Learn more about Fedora Layered Images

Learn more about CentOS Container Pipeline

Community News

CentOS Atomic Host 7.1711 Available for Download

Last week, the CentOS Atomic SIG released an updated version of CentOS Atomic Host (7.1711), a lean operating system designed to run Linux containers, built from standard CentOS 7 RPMs, and tracking the component versions included in Red Hat Enterprise Linux Atomic Host.

This release rolls up a handful of minor CentOS updates from the past month. The core Atomic component versions are unchanged from those in the previous release (7.1710).

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Fedora 27 Atomic Host November 30th Release

A new Fedora Atomic Host update is available via an OSTree commit:

Version: 27.16
Commit(x86_64): 86727cdbc928b7f7dd0e32f62d3b973a8395d61e0ff751cfea7cc0bc5222142f
Commit(aarch64): 49f9b422bc53b30aea3074c75a15e8322ed1d14980ff0b5f9c694089598b4f2f
Commit(ppc64le): 600955d77630fec6d1d3a76af31d872f2fed8af1495399256a0dfff013a518f3

This is a large update as it is the first update in Fedora 27. Included are new kernel, systemd, ostree, rpm-ostree, and atomic CLI. Future updates should be quite a bit smaller than this.

We are releasing images from multiple architectures but please note that x86_64 architecture is the only one that undergoes automated testing at this time.

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Installing etcd as a System container

Since Fedora 27 Atomic recommends installing Kubernetes as a system container, what follows is a refresher on them featuring etcd.

System containers exist as a way to provide containerized services to a host before traditional container runtimes are ready. System containers do this by utilizing a runc and systemd units and do not deviate from the OCI standards. Let’s look at how someone can use a system containers to install the ever popular etcd today on Fedora 27 Atomic Host!

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Fedora 27 Atomic Host Availability on Multiple Architectures

Picture of OverDrive1000 ARM64 system, loaned to Project Atomic by the ARM coalition

We are proud to announce that multiple architectures are now supported with Fedora 27 Atomic Host release! Now, along with x86_64 architecture, Atomic Host is also available on 64 bit ARM (AArch64) and PowerPC Little Endian (ppc64le). Both aarch64 and ppc64le architectures will receive Atomic OSTree updates in the same way x86_64 does.

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