home-k8s-cluster

This repository contains the configuration, scripts, and other goodies for building and managing my home cluster. I share the source with you so you can make exactly the same mistakes as I do.

Setup

Setup the pre-commit hooks before you change anything!

pip install pre-commit
pre-commit install --install-hooks
pre-commit autoupdate

Provision Machines

Before we interact with the cluster, we have some manual work to do.

Manual Preparation

• Currently, my nodes are Arch Linux machines on bare metal
  • Nodes must be ready to be controlled via Ansible
    • Have python3 installed
    • Need to be ssh-able from a controller (my workstation)
      • curl -L files.lyte.dev/key.pub >> ~/.ssh/authorized_keys

TODO: script this? maybe custom ISO+PXEBoot? Talos+Sidero?

Automated Provisioning

• Setup Ansible on the controller (from ./ansible)
  • ansible-galaxy install -r requirements.yml --force
• Verify Ansible can reach hosts (from ./ansible)
  • ansible all -i inventory/hosts.yml --list-hosts
  • ansible all -i inventory/hosts.yml -m ping
• Use Ansible to build the cluster as configured on all nodes (from ./ansible)
  • ansible-playbook -i inventory/hosts.yml ./build-k3s-cluster

And the cluster is up! If you want to interact with it from your controller, you can do this:

ansible -i ansible/inventory/hosts.yml $REMOTE_HOST -m fetch \
  -a "src=/etc/rancher/k3s/k3s.yaml dest=./k3s-cluster-config.kubeconfig.yaml flat=yes"
# TODO: this did not work for me
# env KUBECONFIG="~/.kube/config:./k3s-cluster-config.kubeconfig.yaml" \
# kubectl config view --flatten | sed "s/127.0.0.1/$REMOTE_HOST/" > ~/.kube/new-config

• Copy the cluster information from the ./k3s-cluster-config.kubeconfig.yaml file into your existing ~/.kube/config (or just copy it there if it doesn't exist)
  • You will need to edit the host from localhost/127.0.0.1 to the correct host

Automated Teardown

ansible-playbook -i inventory/hosts.yml ./nuke-k3s-cluster

Setting up Flux

• Install the flux CLI on a machine that can kubectl into the shiny, new cluster
  • paru -S flux-bin
  • or curl -s https://fluxcd.io/install.sh | sudo bash
  • https://fluxcd.io/docs/installation/
• Run the pre-flight check (you must have ~/.kube/config setup!)
  • flux check --pre
• Create the flux-system namespace
  • kubectl create namespace flux-system --dry-run=client -o yaml | kubectl apply -f -
• Add the sops-age encryption key to the namespace

  pass home-k8s-cluster | grep age-secret-key | aws '{printf $2}' | \
    kubectl --namespace flux-system create secret generic sops-age \
    --from-file=age.agekey=/dev/stdin
  

• Install Flux
  • `kubectl apply --kustomize=