Erich Blume 27d8f3cf1f Review gandi-operations doc and reorganize how-to guides (#200 )

## Summary
- **Doc review:** Reviewed `gandi-operations.md` — added `last-reviewed` frontmatter, verified all wiki-links, confirmed Pulumi state has no drift
- **Gandi reference fix:** Added missing `cv.eblu.me` CNAME row to `gandi.md` DNS records table (was present in Pulumi but undocumented)
- **Pulumi comment fix:** Updated stale `README.md` reference in `__main__.py` to point to `docs/how-to/gandi-operations.md`
- **How-to reorg:** Moved 14 how-to guides into 3 subdirectories (`deployment/`, `configuration/`, `operations/`), collapsed the Documentation and Database index sections into Configuration and Operations respectively

## Verification
- `docs-check-links` — all 180 wiki-links valid
- `docs-check-filenames` — all 90 filenames unique
- `dns-preview` — 5 resources unchanged, no drift
- All pre-commit hooks pass

## Test plan
- [ ] Verify docs site builds correctly with new paths
- [ ] Spot-check a few wiki-links from other pages to moved how-to guides

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/200

2026-02-17 07:29:33 -08:00

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Gandi

DNS hosting provider for the eblu.me domain, managed via Pulumi IaC.

Quick Reference

Property	Value
Domain	`eblu.me`
Provider	Gandi LiveDNS
IaC	`pulumi/gandi/`
Stack	`eblu-me`

What It Does

Gandi hosts the DNS records that make *.ops.eblu.me resolve to indri's Tailscale IP (indri.tail8d86e.ts.net). Since Tailscale IPs are not publicly routable, this gives services real DNS names while keeping them private to the tailnet.

The target IP is resolved dynamically from indri.tail8d86e.ts.net at deploy time, so if indri's Tailscale IP changes, re-running the deployment is sufficient.

DNS Records

Private services (Caddy on indri)

Record	Type	Value	TTL
`*.ops.eblu.me`	A	indri's Tailscale IP	300s
`ops.eblu.me`	A	indri's Tailscale IP	300s

Both records point to indri, which runs caddy as the reverse proxy for all private services.

Public services (Fly.io proxy)

Record	Type	Value	TTL
`docs.eblu.me`	CNAME	`blumeops-proxy.fly.dev`	300s
`cv.eblu.me`	CNAME	`blumeops-proxy.fly.dev`	300s

Public CNAMEs point to flyio-proxy on Fly.io. See expose-service-publicly for adding new public services.

See routing for the full service URL map.

Pulumi Configuration

The Pulumi program lives in pulumi/gandi/:

__main__.py - Creates the two A records via pulumiverse_gandi
Pulumi.eblu-me.yaml - Stack config (domain, subdomain)

Stack config values:

Key	Value
`blumeops-dns:domain`	`eblu.me`
`blumeops-dns:subdomain`	`ops`

A break-glass override is available via the BLUMEOPS_REVERSE_PROXY_IP environment variable, which bypasses dynamic IP resolution.

TLS Integration

caddy uses Gandi's API separately (via GANDI_BEARER_TOKEN) for ACME DNS-01 challenges to obtain a wildcard Let's Encrypt certificate for *.ops.eblu.me. This is a different credential from the Pulumi PAT.

Authentication

Gandi requires a Personal Access Token (PAT) for API access. PATs have a maximum lifetime of 90 days (currently set to 30). See gandi-operations for deployment and PAT cycling instructions.

gandi-operations - PAT cycling and deployment how-to
routing - Service URLs and routing architecture
caddy - Reverse proxy using Gandi for TLS
tailscale - Tailnet networking
indri - Server hosting Caddy (DNS target)

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