Kubernetes Cluster - GitOps Configuration

Kubernetes cluster bootstrapping and GitOps configuration repository using ArgoCD for UpCloud Managed Kubernetes

---

📚 Complete Documentation

New developers and operators: Please refer to our comprehensive documentation for detailed guides and references:

🎯 START HERE: Documentation Index

Document	Description	Audience
GitOps Architecture	System architecture, repository structure, GitOps workflows, security model	Everyone (start here)
Developer Guide	Local setup, deploying apps, managing secrets, troubleshooting	Developers
Operations Runbook	Cluster bootstrap, day-to-day operations, incident response, maintenance	Platform Engineers, SREs
Technical Reference	Component specs, Helm charts, ArgoCD config, Kyverno policies, API docs	Everyone (reference)

---

🚀 Quick Start

For New Developers

# 1. Clone repositories
git clone https://github.com/fortedigital/sturdy-adventure.git
git clone git@github.com:fortedigital/helm-values.git

# 2. Read the guides
# - Start: docs/GITOPS-ARCHITECTURE.md
# - Follow: docs/DEVELOPER-GUIDE.md

# 3. Deploy your first app (see Developer Guide)

For Operators

# 1. Bootstrap new cluster
./bootstrap.sh

# 2. Verify deployment
kubectl get applications -n argocd
kubectl get pods --all-namespaces

# 3. Read Operations Runbook for day-to-day tasks

---

📋 Overview

This repository contains the complete GitOps configuration for our Kubernetes cluster, using the App-of-Apps pattern with ArgoCD.

What's Inside

• Infrastructure Applications: Traefik, Cert-Manager, Kyverno, Prometheus, Grafana, Loki, Tempo, Sealed Secrets
• Business Applications: MCP10X, MusicMan, Dot-AI Stack, ArgoCD MCP
• Policies: Kyverno security policies for secret management, namespace controls, pod verification
• Monitoring: Full observability stack with metrics, logs, traces, and alerting
• Secrets: Sealed Secrets for secure Git storage

Key Features

✅ GitOps-Native: Git is the single source of truth ✅ Auto-Sync: Changes automatically deployed (60s reconciliation) ✅ Self-Healing: Manual cluster changes are reverted ✅ Multi-Source: Separate chart templates from configuration ✅ Policy Enforcement: Kyverno ensures security and compliance ✅ Authentication: Automatic sidecar injection (token & OIDC support) ✅ TLS Everywhere: Automatic Let's Encrypt certificates ✅ Full Observability: Prometheus, Grafana, Loki, Tempo integration

---

🗂️ Repository Structure

.
├── bootstrap.sh                # Cluster initialization script
├── _app-of-apps.yaml          # Root ArgoCD Application (App-of-Apps pattern)
│
├── infra/                     # Infrastructure ArgoCD Applications
│   ├── enterprise-apps.yaml   # Manages all apps in apps/ folder
│   ├── traefik-application.yaml
│   ├── cert-manager-application.yaml
│   ├── kyverno.yaml
│   ├── prometheus.yaml
│   ├── grafana.yaml
│   ├── loki.yaml
│   ├── tempo.yaml
│   ├── fluent-bit.yaml
│   ├── trivy.yaml
│   ├── sealedsecrets.yaml
│   └── values/                # Helm value overrides
│
├── apps/                      # Business Applications
│   ├── mcp10x.yaml
│   ├── musicman.yaml
│   ├── dot-ai-stack.yaml
│   └── argo-mcp.yaml
│
├── cluster-resources/         # Cluster-wide Kubernetes resources
│   ├── letsencrypt-issuer.yaml
│   ├── kyverno-config.yaml
│   ├── *-sealed.yaml          # Sealed secrets
│   └── policies/              # Kyverno policies
│       ├── secret-cloner.yaml
│       ├── default-ns-blocker.yaml
│       ├── bare-pod-cleaner.yaml
│       └── auth-sidecar-injector.yaml
│
├── secrets/                   # Application secrets (sealed)
│   └── *-credentials-sealed.yaml
│
├── private/                   # Local-only files (Git-ignored)
│   └── *.yaml                 # Unsealed secrets (never committed)
│
└── docs/                      # 📚 Comprehensive documentation
    ├── README.md              # Documentation index
    ├── GITOPS-ARCHITECTURE.md # Architecture guide
    ├── DEVELOPER-GUIDE.md     # Developer onboarding
    ├── OPERATIONS-RUNBOOK.md  # Operations procedures
    └── REFERENCE.md           # Technical reference

See GitOps Architecture - Repository Structure for detailed explanation.

---

🏗️ Architecture

Three-Repository Pattern

Repository	Purpose	Who Edits	How Often
sturdy-adventure (this repo)	ArgoCD Applications, cluster resources	Platform / DevOps engineers	✅ Often
forte-helm	Generic Helm chart templates	Platform engineers	❌ Rarely
helm-values	App-specific configuration & versions	Developers / CI pipelines	✅ Sometimes

GitOps Workflow

Developer commits code → CI/CD builds image → Updates helm-values → ArgoCD syncs → Deployed to cluster

Learn more: GitOps Architecture - GitOps Workflow

---

🔧 Common Tasks

Deploy a New Application

See detailed guide: Developer Guide - Deploying Your First Application

Quick version:

1. Create apps/myapp.yaml (ArgoCD Application manifest)
2. Create helm-values/myapp/values.yaml (configuration)
3. Create sealed secrets if needed
4. Commit and push - ArgoCD auto-syncs!

Update an Existing Application

See detailed guide: Developer Guide - Updating an Existing Application

Quick version:

• Update code: Push to app repo → CI/CD updates image tag in helm-values
• Update config: Edit helm-values/myapp/values.yaml → commit → push

Manage Secrets

See detailed guide: Developer Guide - Working with Secrets

# Create plain secret
kubectl create secret generic myapp-creds \
  --from-literal=KEY=value \
  --dry-run=client -o yaml > private/myapp-creds.yaml

# Seal it
kubeseal --format=yaml --cert=pub-cert.pem \
  < private/myapp-creds.yaml > secrets/myapp-creds-sealed.yaml

# Commit sealed version
git add secrets/myapp-creds-sealed.yaml
git commit -m "Add myapp credentials"
git push

Enable Authentication

See detailed guide: Developer Guide - Enabling Authentication

Quick version:

# In helm-values/myapp/values.yaml

# Token-based auth (simple)
auth:
  enabled: true
  type: token
  tokens:
  - your-secret-token-here

# OIDC auth (SSO)
auth:
  enabled: true
  type: oidc
  oidc:
    authority: https://auth.example.com/realms/master
    clientId: myapp

Then create OIDC secret (if using OIDC):

kubectl create secret generic auth-oidc \
  --from-literal=client-secret=your-oidc-secret \
  --from-literal=cookie-secret=$(openssl rand -hex 32) \
  --namespace=myapp | \
  kubeseal --format=yaml --cert=pub-cert.pem --namespace=myapp | \
  kubectl apply -f -

Bootstrap Cluster

See detailed guide: Operations Runbook - Cluster Bootstrap

# Initialize new cluster
./bootstrap.sh

# Verify
kubectl get applications -n argocd
kubectl get pods --all-namespaces

---

🛠️ Quick Reference

Monitor Applications

# List all ArgoCD applications
kubectl get applications -n argocd

# Watch sync status
kubectl get applications -n argocd -w

# Check specific application
kubectl describe application myapp -n argocd

# View application logs
kubectl logs -n myapp <pod-name>

Access UIs

# ArgoCD UI
kubectl port-forward svc/argocd-server -n argocd 8080:443
# Access: https://localhost:8080 (no auth required)

# Grafana
kubectl port-forward -n monitoring svc/grafana 3000:80
# Access: http://localhost:3000

# Prometheus
kubectl port-forward -n monitoring svc/prometheus-server 9090:80
# Access: http://localhost:9090

Troubleshooting

# Check pod status
kubectl get pods -n myapp

# View pod logs
kubectl logs -n myapp <pod-name>

# Check pod events
kubectl describe pod -n myapp <pod-name>

# Check ArgoCD sync errors
kubectl describe application myapp -n argocd

# Force sync
kubectl patch application myapp -n argocd \
  --type merge -p '{"metadata":{"annotations":{"argocd.argoproj.io/refresh":"hard"}}}'

Full troubleshooting guide: Developer Guide - Troubleshooting

---

🔐 Security

Secret Management

• ✅ Sealed Secrets for Git storage
• ✅ Kyverno auto-clones secrets to namespaces
• ❌ Never commit plain secrets

Network Security

• ✅ All traffic TLS-encrypted (Let's Encrypt)
• ✅ HTTP → HTTPS redirect
• ✅ Traefik IngressRoute per application

Policy Enforcement

• ✅ Kyverno policies for security
• ✅ Default namespace blocked
• ✅ Bare pods not allowed
• ✅ Optional authentication sidecar injection

Learn more: GitOps Architecture - Security Model

---

📊 Infrastructure Components

Component	Purpose	Namespace	Replicas
ArgoCD	GitOps controller	argocd	1
Traefik	Ingress controller	traefik	2
Cert-Manager	TLS certificates	cert-manager	1
Kyverno	Policy engine	kyverno	1
Sealed Secrets	Secret encryption	kube-system	1
Prometheus	Metrics	monitoring	1
Grafana	Dashboards	monitoring	1
Loki	Logs	monitoring	1
Tempo	Distributed tracing	monitoring	1
Fluent-Bit	Log shipping	monitoring	DaemonSet
Trivy	Vulnerability scanning	trivy-system	1

Full specs: Technical Reference - Infrastructure Components

---

🌐 Domains & Networking

• Local development: *.127.0.0.1.nip.io
• Production: *.forteapps.net
• DNS: Manual configuration (contact platform team)
• TLS: Automatic via Let's Encrypt

---

📖 Key Concepts

App-of-Apps Pattern

_app-of-apps.yaml is the root Application that manages all other Applications in infra/. Each YAML in infra/ becomes a child Application managed by ArgoCD.

Multi-Source Pattern

Applications reference both:

1. Helm charts from forte-helm (templates)
2. Values from helm-values (configuration)

This separates reusable templates from environment-specific config.

Sync Waves

Applications deploy in order using argocd.argoproj.io/sync-wave:

• Wave -1: Namespaces
• Wave 0: Kyverno (policies)
• Wave 1: Infrastructure
• Wave 2+: Applications

Auto-Sync & Self-Heal

• Auto-Sync: ArgoCD automatically deploys Git changes (60s polling)
• Self-Heal: Manual cluster changes are reverted to match Git
• Prune: Deleted resources in Git are removed from cluster

Learn more: GitOps Architecture - GitOps Workflow

---

⚙️ Configuration

ArgoCD Settings

• Reconciliation: Every 60 seconds
• Sync timeout: 5 minutes per application
• Retry policy: 5 attempts with exponential backoff
• Authentication: Disabled (internal use only)

Application Defaults

• Auto-sync: Enabled
• Self-heal: Enabled
• Prune: Enabled
• Validation: Server-side validation enabled
• Server-side apply: Enabled

Full configuration: Technical Reference - ArgoCD Configuration

---

🆘 Getting Help

Documentation

1. Start here: Documentation Index
2. For development: Developer Guide
3. For operations: Operations Runbook
4. For reference: Technical Reference

Support

• Slack: #platform-support
• Issues: Contact platform team
• Emergencies: Escalate via Slack

Common Questions

Question	Answer
How do I deploy an app?	Developer Guide - Deploying Your First Application
How do I manage secrets?	Developer Guide - Working with Secrets
App won't sync?	Developer Guide - Troubleshooting
How do I bootstrap a cluster?	Operations Runbook - Cluster Bootstrap
Where are the logs?	Operations Runbook - Monitoring & Alerting

---

🤝 Contributing

Adding a New Application

1. Read Developer Guide - Deploying Your First Application
2. Create ArgoCD Application manifest in apps/
3. Create Helm values in helm-values/
4. Create sealed secrets if needed
5. Commit and push - ArgoCD handles the rest!

Modifying Infrastructure

1. Read Operations Runbook
2. Update relevant files in infra/ or cluster-resources/
3. Test changes in isolated namespace if possible
4. Commit and push
5. Monitor sync status in Slack/ArgoCD UI

Updating Documentation

Documentation lives in docs/. To update:

1. Edit relevant markdown file
2. Update "Last Updated" date
3. Submit PR or push directly
4. Notify team of significant changes

---

📝 Notes

Current Environment

• Provider: UpCloud Managed Kubernetes
• Environment: Production (internal use only)
• Cluster: Single cluster
• Auth: Disabled for ArgoCD (internal access)
• Backup: None (cluster rebuildable via GitOps)

Known Limitations

• No automated backups (yet)
• Secret rotation not automated
• Single cluster (no multi-cluster setup)
• DNS management is manual

Future improvements: See Operations Runbook - Disaster Recovery

---

📚 Additional Resources

External Documentation

• ArgoCD Documentation
• Kyverno Documentation
• Traefik Documentation
• Cert-Manager Documentation
• Grafana Tempo Documentation
• Sealed Secrets

Related Repositories

• forte-helm - Helm chart templates
• helm-values - Application values

---

📄 License

Internal use only. Not for public distribution.

---

👥 Maintainers

Platform Team

• Contact: #platform-support on Slack
• Issues: Create issue in repository or contact team directly

---

Last Updated: 2026-03-16 Documentation Version: 1.0.0

🚀 Ready to get started? Check out the Documentation Index!