homelab/_FLUX_START_HERE.md

# Flux CD Integration Planning — START HERE

## What Just Happened?

Your subagent completed **comprehensive planning documentation** for integrating Flux CD v2 with your homelab's helmfile-based infrastructure.

**Three complete documents created:**

1. **FLUX_INTEGRATION_PLAN.md** (1,810 lines)
   - Full technical specification with code examples
   - Phase-by-phase implementation roadmap
   - Conflict resolution & safety procedures
   - Testing strategy & risk assessment

2. **FLUX_PLANNING_SUMMARY.md** (351 lines)
   - Executive overview for stakeholders
   - Decision matrices & quick reference
   - Timeline & effort estimates
   - Success metrics

3. **FLUX_PLANNING_INDEX.md** (356 lines)
   - Navigation guide across all documents
   - Quick start for different audiences
   - FAQ & next steps

**Total:** 2,517 lines of planning documentation

---

## The Plan in 60 Seconds

### What Problem Are We Solving?

Current helmfile workflow:
- Manual `helmfile apply` required
- No automatic drift detection
- No Git audit trail for changes
- No approval gates
- Hard to scale to multi-cluster

### What's the Solution?

Deploy **Flux CD v2** (GitOps) to:
- Continuously reconcile cluster state from Git
- Auto-detect & correct drift
- Maintain full audit trail
- Support staged rollouts with approval gates
- Keep helmfile.yaml.gotmpl as fallback during transition

### How Do We Do It?

**3 phases, 6–8 weeks, ~99 hours:**

| Phase | Timeline | Work | Goal |
|-------|----------|------|------|
| **1** | Weeks 1–2 | Bootstrap Flux + helmfile bridge | Zero breaking changes |
| **2** | Weeks 3–6 | Migrate 23 releases to HelmRelease CRDs | Parallel migration (4 streams) |
| **3** | Weeks 7–8 | Enable auto-sync, metrics, runbooks | Full GitOps readiness |

**Key:** No downtime. Helmfile stays functional as fallback throughout.

---

## Architecture Simplified

```
Git (Forgejo) ← Source of Truth
  └─→ Flux Reconciliation Loop (every 5 min)
      └─→ Kubernetes Cluster
          └─→ 23 Helm Releases (reconciled state)
```

That's it. Flux watches Git. When you push changes, Flux applies them. If someone manually changes the cluster (kubectl), Flux auto-corrects on next reconciliation.

---

## Key Decisions (No Surprises)

| Decision | Choice | Reasoning |
|----------|--------|-----------|
| **Controller** | Flux v2 | Stable, battle-tested; v3 still beta |
| **Helm** | HelmRelease CRDs | Preserves values-based workflow |
| **Secrets** | SOPS + age | Git-stored, audited, simple |
| **Rollout** | Phased (3×8 weeks) | Lower risk, easier debugging |

All decisions explained in detail in FLUX_INTEGRATION_PLAN.md §3 (Architecture Decision Matrix).

---

## What You Get

### By End of Phase 1 (Week 2)
- ✅ Flux running in cluster
- ✅ Git syncing every 60 seconds
- ✅ Helmfile still works as fallback
- ✅ Zero disruption to running workloads

### By End of Phase 2 (Week 6)
- ✅ All 23 releases migrated to Git-based HelmRelease CRDs
- ✅ Helmfile no longer used for deployments
- ✅ Every release tested & verified
- ✅ Full test suite in place

### By End of Phase 3 (Week 8)
- ✅ Automatic reconciliation enabled
- ✅ Drift detection + alerting working
- ✅ Metrics flowing to Prometheus
- ✅ Team trained on GitOps workflows
- ✅ RTO < 2 hours (restore from Git if needed)

---

## How to Read the Documentation

### Quick Overview (10 min)
→ **Read:** FLUX_PLANNING_SUMMARY.md

Start here to understand what we're doing and why. Tables, diagrams, high-level summary. Perfect for stakeholder presentations.

### Getting Ready to Build (1 hour)
→ **Read:** FLUX_PLANNING_INDEX.md + FLUX_INTEGRATION_PLAN.md (Executive Summary)

Learn the full architecture, decision rationale, and how phases fit together.

### Phase 1 Implementation (Week 1–2)
→ **Reference:** FLUX_INTEGRATION_PLAN.md §5.1 (Phase 1: Flux Bootstrap)

Detailed tasks:
- 1.1: Bootstrap Flux into cluster
- 1.2: Create Git repo structure
- 1.3: HelmRepository CRDs (13 repos)
- 1.4: SOPS + age setup
- 1.5: Helmfile-bridge CronJob

### Phase 2 Migration (Weeks 3–6)
→ **Reference:** FLUX_INTEGRATION_PLAN.md §5.2 (Phase 2: HelmRelease Migration)

Four parallel streams:
- Stream A: Low-risk (reloader, prometheus)
- Stream B: Medium-risk (cert-manager, ingress)
- Stream C: High-risk secrets (authentik, vault)
- Stream D: Complex stateful (minio, forgejo)

Per-release process: generate CRD → validate → deploy → test → commit

### Phase 3 Production Readiness (Weeks 7–8)
→ **Reference:** FLUX_INTEGRATION_PLAN.md §5.3 (Phase 3: Continuous Reconciliation)

Auto-sync, metrics, runbooks, team training.

### Troubleshooting & Rollback
→ **Reference:** FLUX_INTEGRATION_PLAN.md §7 (Rollback & Safety Guardrails)

How to recover if something breaks:
- Suspend Flux + manual rollback
- Git revert + auto-reconciliation
- Disaster recovery from Git

### Testing Strategy
→ **Reference:** FLUX_INTEGRATION_PLAN.md §8 (Testing Strategy)

Unit tests, integration tests, chaos tests, production deployment strategy.

---

## Risk Summary

### Main Risks & How We Handle Them

| Risk | Mitigation |
|------|-----------|
| **Flux + helmfile conflict** | Stagger reconciliation (helmfile 30min, Flux 5min) |
| **Secret injection breaks** | Three-tier approach (SOPS + ConfigMaps + .env fallback) |
| **Secrets leak in Git** | SOPS encryption from start + pre-commit hooks |
| **Cluster recovery fails** | Keep helmfile as fallback; test quarterly |

All risks detailed with specific mitigations in FLUX_INTEGRATION_PLAN.md §9 (Risk Assessment).

---

## Timeline Reality Check

```
Week 1–2:  Phase 1 bootstrap (20 hrs)
           ├─ 1 DevOps engineer + 1 Security engineer
           └─ 0 downtime to running workloads

Week 3–6:  Phase 2 migration (40 hrs)
           ├─ 4 parallel streams (DevOps + Ops + Security)
           └─ Release-by-release (low risk)

Week 7–8:  Phase 3 hardening (16 hrs)
           ├─ DevOps + QA
           └─ Runbooks + training

Total:     ~99 hours (~2.5 FTE-weeks)
           6–8 calendar weeks (with parallelization)
```

Actual timeline depends on:
- Team size (4 engineers = 8 weeks; 2 engineers = 12 weeks)
- Experience with Flux (learning curve ~40 hours)
- Testing rigor (each phase adds 1–2 weeks)

---

## Next Actions

### Immediately (Today)

1. **Review FLUX_PLANNING_SUMMARY.md** (15 min)
   - Understand the approach
   - Check decision matrix
   - Confirm timeline is acceptable

2. **Share with stakeholders**
   - Security team: review SOPS approach
   - Ops team: review rollback procedures
   - Management: confirm timeline & resources

3. **Get approval** for:
   - Phased approach (6–8 weeks)
   - Flux v2 + HelmRelease CRDs
   - SOPS encryption for secrets
   - ~99 hours effort

### Week 1 (Phase 1 Kickoff)

1. **Assign team members**
   - DevOps lead
   - Security engineer (SOPS)
   - Ops engineer (testing)

2. **Bootstrap Flux**
   - `flux bootstrap git` command
   - Set up Git repo structure
   - Deploy HelmRepository CRDs

3. **Start helmfile-bridge development**
   - CronJob to run `helmfile apply` every 30 min
   - Test alongside Flux (staggered intervals)

### Weeks 3–8 (Phases 2 & 3)

Follow the phase roadmap in FLUX_INTEGRATION_PLAN.md with weekly syncs.

---

## Files Created

All in `/Users/rockliang/workplace/homelab/`:

1. **FLUX_INTEGRATION_PLAN.md** (55 KB)
   - Complete technical specification
   - Phase-by-phase breakdown
   - Code examples & detailed procedures

2. **FLUX_PLANNING_SUMMARY.md** (13 KB)
   - Executive overview
   - Decision matrices
   - Quick reference tables

3. **FLUX_PLANNING_INDEX.md** (13 KB)
   - Navigation guide
   - Quick start by audience
   - FAQ & related docs

4. **_FLUX_START_HERE.md** (this file)
   - Quick orientation
   - Next actions

---

## Questions to Ask

Before Phase 1 starts, clarify:

1. **Team capacity?** How many FTE can we dedicate?
   - 4 FTE → 8 weeks
   - 2 FTE → 12 weeks

2. **Timeline flexibility?** Hard deadline or can we adjust?
   - If hard: compress with more parallel streams
   - If flexible: add more testing/validation

3. **Flux experience on team?** Anyone used Flux before?
   - If no: add 1–2 weeks for learning curve
   - If yes: can reduce onboarding time

4. **Multi-cluster plans?** Will you add more clusters after homelab?
   - If yes: design for portability from start
   - If no: homelab-specific is fine

5. **SOPS comfort?** Any concerns about secret encryption in Git?
   - If yes: alternative is store in Vault (referenced from HelmRelease)
   - If no: SOPS is recommended

---

## Document Quality Checklist

The planning documentation includes:

- ✅ **Executive summary** — problem & solution in 1 page
- ✅ **Current state analysis** — what we're migrating from
- ✅ **Architecture decisions** — Flux v2, HelmRelease, SOPS (with reasoning)
- ✅ **Detailed design** — GitRepository, Kustomization, HelmRelease CRDs
- ✅ **3-phase roadmap** — specific tasks, timelines, deliverables, success criteria
- ✅ **Conflict resolution** — helmfile + Flux, .env → SOPS, kubectl drift
- ✅ **Rollback procedures** — what to do if something breaks
- ✅ **Safety guardrails** — RBAC, audit logging, validation webhooks, approval gates
- ✅ **Testing strategy** — unit, integration, chaos, production deployment
- ✅ **Risk assessment** — probability, impact, mitigation for each risk
- ✅ **Timeline & effort** — 99 hours, 6-8 weeks, team composition
- ✅ **Useful commands** — Flux CLI cheatsheet
- ✅ **FAQ** — downtime, rollback, recovery, cost

Ready for review and implementation kickoff.

---

**Status:** Planning phase complete. Ready for team discussion & approval.

**Next:** Review FLUX_PLANNING_SUMMARY.md, approve approach, assign Phase 1 team.