Atomic Host 101 Lab Part 3: Rebase, Upgrade, Rollback

Introduction In Part 2 of this series we learned about configuring container storage on Atomic Host. In this section we will cover the following topics from the outline in Part 0. Atomic Host Rebasing Atomic Host Upgrades and Rollbacks Browsing OS History Rebasing One of the more fascinating aspects of Atomic Host techology is that you can rebase to completely different operating system trees. Let’s take this to an extreme and go from the newer technology in Fedora to the older (more stable) technology in CentOS. [Read More]

Atomic Host 101 Lab Part 2: Container Storage

Introduction In Part 1 of this series we learned a little about the technology behind Atomic Host and how to interact with a deployed system. In this section we will cover the Configuring Storage for Containers topic from the outline in Part 0. History of Container Storage One of the early goals of Atomic Host was to be a good platform for running containerized workloads. This is still a fundamental goal of Atomic Host and certainly includes making sure that the container runtime (currently the docker daemon) has proper storage configuration such that it can get a balance of good performance and stability. [Read More]

Atomic Host 101 Lab Part 1: Getting Familiar

Introduction In Part 0 of this series we helped get a Fedora 26 Atomic Host system set up for the rest of this lab. In this section we will cover the following topics from the outline: Getting Familiar With Atomic Host Viewing Changes To A Deployed System Getting Familiar Atomic Host is built on top of underlying technology known as OSTree and leveraged by an RPM aware higher level technology known as rpm-ostree. [Read More]

Atomic Host 101 Lab Part 0: Preparation

Introduction While Atomic Host has been around since 2014 there are still a lot of people that aren’t as familiar with the technology. The Atomic team within Red Hat, along with numerous other upstream contributors, have brought the OSTree and RPM-OSTree technology a long way. At the Fedora user and contributor conference (known as Flock) this week we will be giving a lab on Atomic Host designed to let new users learn about Atomic Host. [Read More]

Fedora 26 Atomic Host August 08 Release

cross posted with this Project Atomic blog post A new Fedora Atomic Host update is available via an OSTree commit: Commit: f6331bcd14577e0ee43db3ba5a44e0f63f74a86e3955604c20542df0b7ad8ad6 Version: 26.101 In this release we have fixed an issue with our qcow and vagrant images from the 20170723 release. If you used the qcow or vagrant images from that release then please make sure you are following the fedora/26/x86_64/atomic-host ref. See this Atomic Working Group issue for more details. [Read More]

How Do We Create OSTree Repos and Artifacts in Fedora

a more permanent version of this content lives here Introduction NOTE: For background on OSTree check out the docs. When you want to create a new OSTree using rpm-ostree you usually define a few yum repos, and then a json file that says what rpms you want to be composed in the tree. You then run an rpm-ostree compose tree command to create the commit in the ostree repo. Once the ostree commit has been created you can then create installer images (ISOs) and cloud/VM images (qcow, etc) from that ostree. [Read More]

Fedora 25->26 Atomic Host Upgrade Guide

cross posted with this Project Atomic blog post and this Fedora Magazine post Introduction In July we put out the first and second releases of Fedora 26 Atomic Host. In this blog post we’ll cover updating an existing Fedora 25 Atomic Host system to Fedora 26. We’ll cover preparing the system for upgrade and performing the upgrade. NOTE: If you really don’t want to upgrade to Fedora 26 see the later section: Appendix B: Fedora 25 Atomic Host Life Support. [Read More]