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homelab-infra/platform/cert-manager/certificate-auth-ddupan.yaml
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Establish clean homelab infrastructure baseline
Reorganize the brownfield repository, remove retired and generated artifacts, harden ignore rules, and record the GitOps/IaC redesign.
2026-09-09 16:47:20 +00:00

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YAML

# Cert for the PUBLIC Authelia hostname, so it can also be served on the LAN.
#
# WHY this exists at all, when ../envoy-gateway/gateway.yaml says adding a service
# needs no cert work: that promise holds only for `*.ad.ddupan.top`. Authelia is
# reached at `auth.ddupan.top` — a different zone (Cloudflare is authoritative for
# ddupan.top; the DC is authoritative only for ad.ddupan.top) and one label
# shallower, so the wildcard cannot cover it.
#
# WHY serve a public name internally (split-horizon) rather than introduce an
# internal alias: the OIDC issuer, every registered redirect_uri, and the session
# cookie domain are all `auth.ddupan.top`. Changing the name Gitea talks to would
# mean re-registering every client. Resolving the SAME name to the LAN changes
# nothing Authelia knows about itself.
#
# WHAT BROKE WITHOUT IT (2026-07-28): auth.ddupan.top resolves to Cloudflare proxy
# IPs (104.21.6.55 / 172.67.154.245). TCP/443 to both fails from this network,
# persistently, while other Cloudflare IPs (104.16.132.229) connect fine. Gitea's
# chart runs `gitea admin auth update-oauth` in an INIT container, which fetches
# the discovery URL on every pod start — so Gitea CrashLoopBackOff'd on any
# restart, and server-side token exchange timed out. Routing the name to the LAN
# removes the public internet from an entirely in-cluster conversation. See
# CLAUDE.md: "Internal name resolution must never depend on the WAN."
#
# CT-log note: ../cert-manager/certificate-wildcard-ad.yaml deliberately uses a
# wildcard to keep internal hostnames out of Certificate Transparency logs. That
# reasoning does not apply here — auth.ddupan.top is already public in CT via the
# Cloudflare-facing cert, so naming it costs nothing.
#
# Lives in envoy-gateway-system because a Gateway listener may only reference a
# Secret in the Gateway's own namespace.
---
apiVersion: cert-manager.io/v1
kind: Certificate
metadata:
name: auth-ddupan-top
namespace: envoy-gateway-system
spec:
secretName: auth-ddupan-top-tls
issuerRef:
name: letsencrypt
kind: ClusterIssuer
group: cert-manager.io
commonName: "auth.ddupan.top"
dnsNames:
- "auth.ddupan.top"
# DNS-01 via Cloudflare (the letsencrypt ClusterIssuer's solver). Cloudflare stays
# authoritative for ddupan.top, so the challenge resolves publicly even though the
# A record we serve internally points at the LAN.
duration: 2160h # 90d — Let's Encrypt maximum
renewBefore: 720h # 30d
privateKey:
algorithm: ECDSA
size: 256
rotationPolicy: Always