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Single Node Kubernetes on CoreOS - Complete Setup Guide
Single Node Kubernetes on CoreOS - Complete Setup Guide#
Setting up a lightweight, single-node Kubernetes environment is perfect for development, testing, and learning purposes. This guide walks you through deploying Kubernetes on Fedora CoreOS - a minimal, container-focused operating system designed for running containerized workloads.
We’ll break this process into two main stages:
- Setting up the CoreOS virtual machine
- Installing and configuring Kubernetes
Prerequisites#
Before starting, ensure you have the following on your host system:
- Fedora CoreOS qcow2 image (download here)
- podman installed (
dnf install podman) - libvirt and virt-install tools (
dnf install libvirt virt-install) - A generated SSH key pair (
ssh-keygen -t ed25519)
Stage 1: Basic CoreOS Setup#
1. Create Basic Ignition Config#
Ignition is the CoreOS configuration system. Create a file named basic.bu:
1variant: fcos2version: 1.4.03passwd:4 users:5 - name: core6 ssh_authorized_keys:7 - YOUR_SSH_PUBLIC_KEY_HERE8
9storage:10 files:11 - path: /etc/hostname12 mode: 064413 contents:14 inline: |15 k8s-nodeReplace YOUR_SSH_PUBLIC_KEY_HERE with the content of your ~/.ssh/id_ed25519.pub file.
2. Generate Ignition File#
Convert the Butane configuration to an Ignition file:
1podman run --interactive --rm \2 quay.io/coreos/butane:release \3 --pretty --strict < basic.bu > basic.ign3. Create VM Script#
Create a script named start-node.sh to launch your CoreOS VM:
1#!/bin/sh2
3IGN_CONFIG=/path/to/basic.ign4IMAGE=/path/to/fedora-coreos.qcow25VM_NAME=k8s-node6VCPUS=27RAM_MB=40968DISK_GB=209STREAM=stable10
11chcon --verbose --type svirt_home_t ${IGN_CONFIG}12virt-install --connect="qemu:///system" \13 --name="${VM_NAME}" \14 --vcpus="${VCPUS}" \15 --memory="${RAM_MB}" \16 --os-variant="fedora-coreos-$STREAM" \17 --import --graphics=none \18 --disk="size=${DISK_GB},backing_store=${IMAGE}" \19 --qemu-commandline="-fw_cfg name=opt/com.coreos/config,file=${IGN_CONFIG}"Update the paths to your Ignition config file and CoreOS image.
4. Launch VM#
1chmod +x start-node.sh2./start-node.sh5. Note VM IP Address#
During boot, you’ll see network information. Look for a line showing the IP address assigned to the VM:
Single Node Kubernetes on CoreOS - Complete Setup Guide
https://mranv.pages.dev/posts/single-node-coreos-kubernetes-setup/