How krezh/dextek works
<explanation>
1. Project Type and Purpose
- This is a GitOps‑driven “home operations” repository. You manage multiple Kubernetes clusters (Talos‑provisioned), infrastructure components (IPXE, OpnSense, RouterOS), and applications via declarative manifests (Kustomize, Helm) in Git.
- FluxCD operators in each cluster reconcile the manifests. Terraform handles Talos OS provisioning and router/firewall infrastructure. GitHub Actions and Renovate automate CI/CD and dependency updates.
2. File‑Structure Analysis
- Top‑level concern separation:
• clusters/…: per‑cluster overlays (dextek, jotunheim, shared) with apps, namespaces, kustomizations
• infrastructure/…: IPXE build scripts, OpnSense/RouterOS configurations, Terraform modules
• .github/, Taskfile.yaml, .taskfiles/: CI/CD workflows (GitHub Actions), tasks (Taskfile)
• bootstrap/flux, clusters/*/bootstrap: initial Flux and Helmfile setups
- Each cluster dir contains:
• apps/: HelmRelease + Kustomize overlays for apps grouped by domain (auth, databases, network, monitoring, games, etc.)
• flux‑system/: Flux operator config (KustomizeController, HelmController, GitRepository, etc.)
- Shared components under clusters/shared/templates and clusters/shared/repositories for common Helm/chart definitions.
- Terraform in clusters/<cluster>/terraform and infrastructure/terraform drives Talos provisioning and router/firewall modules.
3. README Insights
- Badges confirm use of Kubernetes, Talos, Flux, Renovate.
- Highlights cluster age, uptime, node and pod counts—emphasizes full observability/monitoring.
4. System‑Design Diagram Guidance
a. Main Components
- GitHub Repository
- CI/CD Pipelines: GitHub Actions (workflows under .github/workflows), Renovate
- Terraform Service (CLI or GitHub Actions)
- FluxCD Operators in each cluster (KustomizeController, HelmController, NotificationController)
- Kubernetes Clusters (dextek, jotunheim) on Talos OS
- Infrastructure Hosts (PXE/IPXE builder, OpnSense Firewall, RouterOS)
- External Dependencies: Secret stores (Doppler, ExternalSecrets), Container registries (OCI, Helm repos)
b. Relationships and Data Flows
- Developer → GitHub Repo (push manifests, update kustomize overlays)
- GitHub Actions → run linting, tests, publish schema, optionally trigger Terraform/apply
- Renovate → open PRs for chart/terraform provider updates
- FluxCD in-cluster → polls GitHub repo → detects new commits → reconciles Kustomize & HelmRelease resources → Kubernetes API
- Terraform → provisions Talos control plane & worker machines, configures network infrastructure (OpnSense, RouterOS)
- ExternalSecrets Controller → fetches secrets from Doppler → injects into Kubernetes Secrets
c. Architectural Patterns
- GitOps: single source of truth in Git
- Declarative infra: Kustomize overlays and HelmRelease CRDs
- Multi‑cluster: per‑cluster overlays under clusters/<cluster>
- Modular reuse: shared templates and repositories
- Infrastructure as code: Terraform + Talos schema + Taskfile orchestration
d. Key Technologies
- FluxCD (GitRepository, KustomizationController, HelmRelease)
- Kustomize & Helm
- Terraform (with modules under infrastructure/terraform)
- Talos OS for Kubernetes nodes
- GitHub Actions & Renovate
- ExternalSecrets (Doppler provider)
5. Tailoring to a GitOps‑Managed Infra Project
- Emphasize the separation:
• Infrastructure provisioning (Terraform, OpnSense, IPXE) vs. application delivery (Flux + Helm/Kustomize)
• Cluster‑bootstrap → flux-system → apps
- Show hierarchy: GitHub Repo → Branches/Overlays → Flux Controllers → Kubernetes resources
- Illustrate feedback loops: cluster health metrics flow back to badge endpoints (prometheus, pushgateway)
6. Diagram Elements to Include
- Clear labels on each box: e.g., “GitHub Repo: home‑ops”
- Directional arrows:
• Solid arrows for “push” or “reconcile” flows
• Dashed arrows for “monitoring/metrics” or “secret fetch” flows
- Color coding or shapes:
• Blue rectangles for Git/GitHub components
• Green for cluster‑resident controllers & resources
• Orange for CI/CD pipelines
• Grey for external services (Doppler, OCI registries)
- Group related items inside containers:
• One container per cluster showing Flux controllers + Kubernetes API + deployed apps
• One container for “Infrastructure” with Terraform, IPXE compiler, OpnSense, RouterOS
7. Level of Detail
- Capture every major overlay directory as a component if helpful (e.g., clusters/<cluster>/apps/network)
- Don’t go down to individual YAML files—focus on groups (apps, monitoring, network, kube-system)
- Highlight controllers (Flux Kustomize, Flux Helm, Terraform) and their targets (machines, clusters)
By following this structure and using the recommended elements, you’ll produce a clear, accurate architecture diagram that reflects the GitOps‑centric, multi‑cluster, multi‑infrastructure nature of this home‑ops project.
</explanation>