xxczaki/homelab

A GitOps-managed Kubernetes homelab running on a Raspberry Pi, powered by Argo CD

Single-node K3s cluster managed entirely through Argo CD using the app-of-apps pattern. Changes merged to main are automatically synced to the cluster using a GitHub webhook.

Tech stack

• Orchestration: K3s – lightweight Kubernetes
• GitOps: Argo CD
• Networking: Cilium (eBPF-based CNI) + Tailscale (mesh VPN, GitOps-managed ACLs)
• Storage: Longhorn with Backblaze B2 backups
• Monitoring: Grafana Cloud (Prometheus, Loki, Tempo) – alerting & OnCall managed via Terraform
• DNS: Pi-hole
• Secrets: Sealed Secrets
• Infrastructure as Code: Terraform (Grafana Cloud) + Ansible (node config)
• Dependency updates: Renovate

Applications

Application	Type	Version
argo-cd	Helm	v9.7.1
cilium	Helm	v1.19.1
discord-bot	Helm	v0.23.0
heartbeat	Git	-
k8s-monitoring	Helm	v4.4.0
longhorn	Helm	v1.12.0
pi-hole	Helm	v2.38.0
sealed-secrets	Helm	v2.18.6
system-upgrade	Git + Kustomize	v0.20.1
tailscale	Helm	v1.102.2

Project structure

.
├── apps/                        # Argo CD application manifests
│   └── <app>/
│       ├── application.yaml     # Argo CD Application resource
│       ├── secret.yaml          # Sealed Secret (if needed)
│       └── resources/           # Additional resources (if needed)
├── ansible/                     # Node provisioning playbooks
│   ├── playbook.yml
│   ├── inventory.yml
│   └── templates/
├── terraform/
│   └── grafana/                 # Grafana Cloud config (contact points, OnCall, notification policies)
├── policy.hujson                # Tailscale ACL policy (GitOps-managed)
├── scripts/                     # Utility scripts
│   ├── seal-secrets.sh
│   ├── extract-secrets.sh
│   └── generate-apps-table.sh
├── secrets/                     # Raw secrets (git-ignored)
└── root-application.yaml        # Root Argo CD Application

Getting started

Prerequisites

• A K3s node (provisioned with the Ansible playbook in ansible/)
• kubectl configured for the cluster
• kubeseal CLI for secret management

Bootstrap

1. Provision the node:

   $ cd ansible && ansible-playbook playbook.yml

2. Install the root application:

   $ kubectl apply -f root-application.yaml

   Argo CD will discover and sync all applications in apps/ automatically.

Secrets

To seal secrets for the cluster:

$ ./scripts/seal-secrets.sh

To extract raw secrets from a running cluster:

$ ./scripts/extract-secrets.sh

Note

Raw secrets are stored in secrets/ and are git-ignored. Only sealed (encrypted) versions are committed.

AI disclosure

This project contains code generated by Large Language Models (LLMs), under human supervision and proofreading.