An updated version of CentOS Atomic Host (tree version 7.20160818), featuring support for rpm-ostree package layering, is available for download. Using the command rpm-ostree pkg-add, it's now possible to layer new packages into an installed image that persist across reboots and upgrades.

CentOS Atomic Host is a lean operating system designed to run Docker containers, built from standard CentOS 7 RPMs, and tracking the component versions included in Red Hat Enterprise Linux Atomic Host.

CentOS Atomic Host is available as a VirtualBox or libvirt-formatted Vagrant box, or as an installable ISO, qcow2 or Amazon Machine image. These images are available for download at cloud.centos.org. The backing ostree repo is published to mirror.centos.org.

CentOS Atomic Host includes these core component versions:

• docker-1.10.3-46.el7.centos.10.x86_64
• kubernetes-1.2.0-0.13.gitec7364b.el7.x86_64
• kernel-3.10.0-327.28.2.el7.x86_64
• atomic-1.10.5-7.el7.x86_64
• flannel-0.5.3-9.el7.x86_64
• ostree-2016.7-2.atomic.el7.x86_64
• etcd-2.3.7-2.el7.x86_64
• cloud-init-0.7.5-10.el7.centos.1.x86_64

Upgrading

If you're running a previous version of CentOS Atomic Host, you can upgrade to the current image by running the following command:

$ sudo atomic host upgrade

Images

Vagrant

CentOS-Atomic-Host-7-Vagrant-Libvirt.box (530 MB) and CentOS-Atomic-Host-7-Vagrant-Virtualbox.box (541 MB) are Vagrant boxes for Libvirt and Virtualbox providers.

The easiest way to consume these images is via the Atlas / Vagrant Cloud setup (see https://atlas.hashicorp.com/centos/boxes/atomic-host). For example, getting the VirtualBox instance up would involve running the following two commands on a machine with vagrant installed:

$ vagrant init centos/atomic-host && vagrant up --provider virtualbox

ISO

The installer ISO (757 MB) can be used via regular install methods (PXE, CD, USB image, etc.) and uses the Anaconda installer to deliver the CentOS Atomic Host. This image allows users to control the install using kickstarts and to define custom storage, networking and user accounts. This is the recommended option for getting CentOS Atomic Host onto bare metal machines, or for generating your own image sets for custom environments.

QCOW2

The CentOS-Atomic-Host-7-GenericCloud.qcow2 (1.1 GB) image is suitable for use in on-premise and local virtualized environments. We test this on OpenStack, AWS and local Libvirt installs. If your virtualization platform does not provide its own cloud-init metadata source, you can create your own NoCloud iso image.

Amazon Machine Images

Region         Image ID

us-east-1      ami-d43d5dc3 
us-west-2      ami-0227f362 
us-west-1      ami-52df9d32
eu-west-1      ami-ed4b3d9e 
eu-central-1   ami-014abb6e 
ap-southeast-1 ami-27a27a44 
ap-northeast-1 ami-4d35fa2c 
ap-southeast-2 ami-65b18606
ap-northeast-2 ami-12ae7b7c 
sa-east-1      ami-6ed34202

SHA Sums

5e2d2bc26d4017f556d3f1e65b6cf1a8ca111534515bbb7a6fea3d446af1b674 CentOS-Atomic-Host-7.1607-GenericCloud.qcow2 c8e908072b63581a7c8a3ffc2658eaf64cb30e1f85db7ed97d1e7fa3605dc26f CentOS-Atomic-Host-7.1607-GenericCloud.qcow2.gz 99776addb6ab2ff25d64831a21eb0c7bfe337be68d402095fd740c05f5d40a3e CentOS-Atomic-Host-7.1607-GenericCloud.qcow2.xz 05ccc8c1db8047028fabb92c89c3fda9f07286f5e7f2832c9ee92a05bf1bc8dc CentOS-Atomic-Host-7.1607-Installer.iso 443af2e145370dee939eaab38df9a61a15a0aa1636e477acb7864a175f78b584 CentOS-Atomic-Host-7.1607-Vagrant-Libvirt.box 7fef5a9c02c4c351f051f73e00f24d3a7ce8c0a081ae0f0956eb820b1211dd06 CentOS-Atomic-Host-7.1607-Vagrant-VirtualBox.box

Release Cycle

The CentOS Atomic Host image follows the upstream Red Hat Enterprise Linux Atomic Host cadence. After sources are released, they're rebuilt and included in new images. After the images are tested by the SIG and deemed ready, we announce them.

Getting Involved

CentOS Atomic Host is produced by the CentOS Atomic SIG, based on upstream work from Project Atomic. If you'd like to work on testing images, help with packaging, documentation -- join us!

The SIG meets weekly on Thursdays at 16:00 UTC in the #centos-devel channel, and you'll often find us in #atomic and/or #centos-devel if you have questions. You can also join the atomic-devel mailing list if you'd like to discuss the direction of Project Atomic, its components, or have other questions.

Getting Help

If you run into any problems with the images or components, feel free to ask on the centos-devel mailing list.

Have questions about using Atomic? See the atomic mailing list or find us in the #atomic channel on Freenode.