OpenShift OKD on Fedora CoreOS on DigitalOcean Part 0: Preparation
Posted on July 28, 2020
| dustymabe
Introduction This blog post is the first in a series that will illustrate how to set up an OpenShift OKD cluster on DigitalOcean using the bare metal install documentation (user provisioned infrastructure). OKD has tight integrations with the Operating System and uses Fedora CoreOS as a platform for driving the underlying infrastructure, thus we’ll be deploying on top of Fedora CoreOS images inside of DigitalOcean.
The documentation for OKD is pretty comprehensive, but there is nothing like having a guide to help fill in some of the gaps and show an example of it working with real world values.
[Read More]
The K9s TUI for Kubernetes
Posted on July 18, 2020
| dustymabe
If you’ve ever had a chance to “nerd out” with me much I’ve probably told you about at least one TUI that I use to make my daily work life easier. Some of my favorites include htop, tig, tmux (not sure if tmux counts), etc..
Lately I’ve been finding myself using Kubernetes/OpenShift much more and I have often thought to myself I wish a nice TUI existed to get in and navigate resources in a Kubernetes environment.
[Read More]
Automating a Custom Install of Fedora CoreOS
Posted on April 4, 2020
| dustymabe
Introduction With Fedora CoreOS we currently have two ways to do a bare metal install and get our disk image onto the spinning rust of a “non-cloud” server. You can use coreos.inst* kernel arguments to automate the install, or you can boot the Live ISO and get a bash prompt where you can then run coreos-installer directly after doing whatever hardware/network discovery that is necessary. This means you either do a simple automated install where you provide all of the information up front or you are stuck doing something interactive.
[Read More]
Network teaming using NetworkManager keyfiles on Fedora CoreOS
Posted on March 5, 2020
| dustymabe
Introduction NetworkManager allows connections to be defined in a configuration file known as a keyfile , which is a simple .ini-style formatted file with different key=value pairs. In Fedora CoreOS we’ve elected to use NetworkManager with keyfiles as the way to configure networking. In case you have a standard networking environment with NICs requesting DHCP then you probably won’t need to configure networking. However, if you’d like to have a static networking config or if you’d like to do something more complicated (like configure network teaming for a few interfaces) then you’ll need to create a keyfile that NetworkManager will then use to configure the interfaces on the machine.
[Read More]
virt-install: boot from specific kernel/initrd just for install
Posted on January 30, 2020
| dustymabe
Introduction For some time now with virt-install (developed under virt-manager) you have been able to specify a kernel and initial ramdisk to start a VM with. The only problem is that the VM will always start with that kernel/initrd (unless you change the definition manually). If you are rapidly testing operating system installations this can be problematic.
On the one hand, providing the kernel/initrd allows one to automate the install process from a Linux terminal, or even a script, by specifying the kernel/initrd and also the kernel command line options.
[Read More]
Devconf.cz 2020 Fedora CoreOS Lab
Posted on January 23, 2020
| dustymabe
Setting Up For The Lab This lab uses a Fedora CoreOS image and several utilities (fcct, ignition-validate) to introduce a user to provisioning and exploring a Fedora CoreOS system. This lab is written targeting a Linux environment with a working libvirt/kvm setup.
To perform this lab you need to download the tar archive at this link (signed checksum file) and extract it.
We recommend extracting it into your home directory like so:
[Read More]
Fedora BTRFS+Snapper - The Fedora 31 Edition
Posted on December 29, 2019
| Dusty Mabe
History It’s almost 2020. Fedora 31 came out a month back and I’m just getting around to converting my desktop system to Fedora 31. As mentioned before, for my laptop systems I’ve moved on to Fedora Silverblue. As I continue to containerize my workflows I’m moving more and more of my daily workflows into Flatpaks from the Fedora registry, pet containers (via toolbox) and, single purpose containers. As I continue to convert my workflows into containers I’ll stick with the BTRFS+snapper setup for my desktop system, which still has the benefits of being able to snapshot and rollback the entire system by leveraging BTRFS snapshots, and a tool called snapper.
[Read More]
Fedora Atomic Host Nearing End Of Life
Posted on November 21, 2019
| dustymabe
cross posted with this Project Atomic blog post
TL;DR Fedora 29 will be End Of Life soon. With it Fedora Atomic Host will have its last incremental release (based on the Fedora 29 stream). Please move to the Fedora CoreOS preview if you can.
Last year we introduced the plans for Fedora CoreOS including that Fedora CoreOS would be the successor to Fedora Atomic Host and Container Linux (from CoreOS Inc.
[Read More]
Running a script on bootup via Ignition
Posted on November 6, 2019
| dustymabe
Introduction With Fedora CoreOS Ignition is being used to configure nodes on first boot. While Ignition json configs are not intended to be a tool that users typically interact with (we are building tooling like fcct for that) I’ll show you an example of how to deliver a script to a Fedora CoreOS (or RHEL CoreOS) host so that it will be run on first boot.
Write the script Let’s say we have a small script we want to run that updates the issuegen from console-login-helper-messages to output the node’s public IPv4 address on the serial console during bootup.
[Read More]
Update on Easy PXE boot testing post: minus PXELINUX
Posted on September 13, 2019
| dustymabe
Introduction This is an update to my previous post about easily testing PXE booting by using libvirt + iPXE.
Several people have notified me (thanks Lukas Zapletal and others) that instead of leveraging PXELINUX that I could just use an iPXE script to do the same thing. I hadn’t used iPXE much so here’s an update on how to achieve the same goal using an iPXE script instead of a PXELINUX binary+config.
[Read More]