tormath1

$ sudo crictl images
IMAGE                                     TAG                 IMAGE ID            SIZE
registry.k8s.io/coredns/coredns           v1.11.1             cbb01a7bd410d       18.2MB
registry.k8s.io/etcd                      3.5.12-0            3861cfcd7c04c       57.2MB
registry.k8s.io/kube-apiserver            v1.29.5             b36112597a5f1       35.2MB
registry.k8s.io/kube-controller-manager   v1.29.5             2242ad7f7c41a       33.6MB
registry.k8s.io/kube-proxy                v1.29.5             2019bbea5542a       28.4MB
registry.k8s.io/kube-scheduler            v1.29.5             e579eb50f57be       18.7MB

tormath1

Configuration:

$ cat .config/sway/config | grep opa
# opacity
set $opacity 0.97
for_window [class=".*"] opacity $opacity
$ cat .config/sway/config | grep disable
disable_titlebar yes
$ sway --version

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# butane < config.yaml > config.json
# ./flatcar_production_qemu.sh -i ./config.json
variant: flatcar
version: 1.0.0
storage:
  files:
    - path: /opt/extensions/docker/docker-24.0.5.raw
      contents:
        source: https://github.com/flatcar/sysext-bakery/releases/latest/download/docker-24.0.5.raw
    - path: /opt/extensions/kubernetes/kubernetes-v1.27.4.raw

tormath1

This is a demo of updating Kubernetes version on Flatcar without updating the OS leveraging Systemd sysext and Kured.

notes:

• It has been tested on a simple control-plane node on Qemu but can be easily extended to CAPI.
• The kubernetes sysext image is provided by https://github.com/flatcar/sysext-bakery.git

Boot an instance with the following Butane config.yaml:

variant: flatcar

tormath1

[CAPO][capo] does test in its CI both Ubuntu and Flatcar. For Flatcar, the image still needs to be built via the image-builder and uploaded on CAPO GCS (Google Cloud Storage).

There is an open issue to bring some automation around this process: kubernetes-sigs/cluster-api-provider-openstack#1502 while it is not done, whether CAPO or Flatcar maintainers needs to do it manually.

1. Once the release is announced

$ cd kubernetes-sigs/image-builder/images/capi
$ make OEM_ID=openstack build-qemu-flatcar

tormath1

#!/usr/bin/env python

# goal of this script is to control (play / pause) multimedia played
# on a firefox tab through dbus

# requirements:
# * dbus (session)
import dbus
import sys

tormath1

Cluster API OpenStack using Flatcar

This is done on devstack environment.

Resources

• YouTube video: https://www.youtube.com/watch?v=H2Eqw33m2S0
• https://github.com/tormath1/tormath1.github.io/blob/main/kcd-munich-flatcar-capi.pdf

From an existing Kubernetes cluster deployed with Kind:

tormath1

# butane < config.yml > ignition.json
---
variant: flatcar
version: 1.0.0
storage:
  disks:
    - device: /dev/vda
      partitions:
        - number: 9
          label: ROOT

tormath1

The goal of this Gist is to run a Tor bridge from a Flatcar instance provisioned through Ignition - in this example, it's deployed locally with QEMU but it can be extend elsewhere (with Terraform and so on.)

Requirements:

• ct
• qemu setup

Pull the latest stable release of Flatcar:

tormath1

# ct --platform custom < ./config.yml | jq > ignition.json
systemd:
  units:
    - name: update-engine.service
      enable: true
    - name: etcd-member.service
      enable: true
    - name: locksmithd.service
      enable: true
      dropins: