Fedora BTRFS+Snapper - The Fedora 27 Edition

History I’m back again with the Fedora 27 edition of my Fedora BTRFS+Snapper series. As you know, in the past I have configured my computers to be able to snapshot and rollback the entire system by leveraging BTRFS snapshots, a tool called snapper, and a patched version of Fedora’s grub2 package. I have some great news this time! You no longer need a patched version of Fedora’s grub package in order to pull this off. [Read More]

Fedora 26->27 Atomic Host Upgrade Guide

cross posted with this Project Atomic blog post Introduction This week we put out the first release of Fedora 27 Atomic Host. Some quick notes: In Fedora 27 Atomic Host we removed kubernetes from the base OSTree. See Appendix A: Upgrading Systems with Kubernetes for more information. For Fedora 27 we are currently sticking with the non-unified repo approach as opposed to a unified repo. TL;DR nothing is changing for now but we expect to implement a unified repo as described here during the F27 release cycle. [Read More]

Setting up an Atomic Host Build Server

Introduction Hosting your own Atomic Host OSTree can be useful from time to time. Maybe you want to try out something new or maybe you want to permanently build your own custom tree and use it forever. It can be quite easy to set up a build server and host the contents, especially for personal use. This post will walk through setting up a server to do builds and also hosting the content over http. [Read More]

Atomic Host 101 Lab Part 5: Containerized and Non-Containerized Applications

Introduction In Part 4 of this series we learned about package layering and experimental features of atomic host OSTree mutations. This included installing packages from external repositories as well as removing and replacing components of the base OSTree that was delivered with Atomic Host. We also converted our localweb service to be hosted by a local docker container running the httpd software rather than Python 3. In this section of the lab we’ll talk a litte bit more about Containerized and Non-Containerized Applications and the role Atomic Host plays. [Read More]

Atomic Host 101 Lab Part 4: Package Layering, Experimental Features

Introduction In Part 3 of this series we learned about rebasing, upgrading, and performing rollbacks on Atomic Host. We also learned how files are restored during a rollback operation and how to inspect the differences in RPM content between each commit in the OSTree history of an Atomic Host using the rpm-ostree command line tool. In this section we will cover the following topics from the outline in Part 0. [Read More]

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]