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GitLab cross-site replication Phase 1a: Postgres network plumbing

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Per the approved plan (jiggly-snacking-iverson.md, 'GitLab True
Cross-Site Replication' section) - replacing the git-mirror CronJob
with real CNPG streaming replication for pg-gitlab and pg-praefect,
reusing the exact pattern already proven for pg-authentik.

This commit is network plumbing only, no DB replication yet:
- Repoint both CNPG clusters' barmanObjectStore backup target from
  in-cluster gitlab-minio-svc to VPS MinIO (also becomes the initial
  seed source for the VPS's replicas in Phase 1c).
- New ha-gitlab-postgres/ha-praefect-postgres NodePort Services
  (bypass CNPG's own -rw Services) on both home and VPS.
- New PeerAuthentication with portLevelMtls PERMISSIVE on the replication
  ports - ambient mesh STRICT default would otherwise reset the
  VPS/witness's connection before the Postgres TLS handshake starts.
- Extended allow-gitlab-access AuthorizationPolicy with a port-scoped
  rule for the same traffic (no source.namespaces rule can match
  external, non-mesh peers).
- CoreDNS rewrites for pg-gitlab.ha.huskypup.net / pg-praefect.ha.huskypup.net
  so home's own pods reach the floating hostname locally instead of
  round-tripping through the WAN forward (no NAT hairpin support).

Still needed before Phase 1b/1c: UniFi WAN port-forwards for external
ports 61442/61443 -> talos-cp-01:32442/32443, source-restricted to the
VPS + witness public IPs (manual, same as the existing 61432 rule).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Scooby Husky
2026-08-22 12:47:03 -05:00
co-authored by Claude Sonnet 5
parent a104008111
commit 04fa80ece3
7 changed files with 236 additions and 5 deletions
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infrastructure/coredns/manifests/coredns-configmap.yaml
+9
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@@ -58,6 +58,15 @@ data:
# specifically so this rewrite target actually has that port.
rewrite name pg-authentik.ha.huskypup.net ha-authentik-postgres.authentik.svc.cluster.local
# GitLab cross-site replication (see
# /home/scooby/.claude/plans/jiggly-snacking-iverson.md) - same
# reasoning as pg-authentik.ha.huskypup.net above: home's own pods
# go straight to the local NodePort Service instead of round-
# tripping out through the UniFi WAN forward and back in (no NAT
# hairpin support, confirmed live for the authentik precedent).
rewrite name pg-gitlab.ha.huskypup.net ha-gitlab-postgres.gitlab.svc.cluster.local
rewrite name pg-praefect.ha.huskypup.net ha-praefect-postgres.gitlab.svc.cluster.local
kubernetes cluster.local in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa