## Why
Replace the `profiles::dns::updater` shell mechanism (`dns-update.sh` + `dns-update.path`/`.service` + the in-run `exec`) with the packaged **dns-updater** daemon. The daemon watches the records file (inotify) and network interfaces and pushes TSIG-signed RFC2136 updates to BIND natively — with structured per-zone RCODEs and a status API/facter fact, so failures like the recent `invalid owner name: empty label` / NOTZONE surface directly instead of as opaque nsupdate stderr.
## Changes
- Install the `dns-updater` package; manage `/etc/dns-updater/env`.
- Run the packaged `dns-updater.service`, restarting **only** on env/key change — records-file edits are picked up by the daemon`s own inotify watch, so no service churn on record changes.
- Keep the `concat` records file and the TSIG key file unchanged (same paths/format).
- Ensure the old `/usr/local/bin/dns-update` + `dns-update.path`/`.service` units are absent.
- Drop the now-dead `dns-update.{sh,service,path}.epp` templates.
## Sequencing — HOLD
Do not merge until the `dns-updater` RPM is published to artifactapi `rpm-internal` (needs terraform-git#33 to create the repo, then the daemon code pushed + tagged so Woodpecker builds the RPM). Merging before the package exists makes `package { dns-updater }` fail on every host.
Supersedes the interim shell fix in #481 (which stays valid until this rolls out). Keeps the file as the desired-state interface (puppet owns desired records; the daemon reconciles + reports).
Reviewed-on: #482
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>
Replaces the exported-resources → puppet DNS master zone-file flow with per-host RFC2136 dynamic updates against the k8s **bind-authoritative** write endpoint (198.18.200.9). The master no longer manages zone files.
## Design
Each node assembles its DNS records into a local concat file; a systemd `.path` unit watches it and runs `dns-update` (nsupdate) on change — exactly the watch-a-file model requested.
## Changes
- **profiles::dns::updater** (new): concat records file + TSIG key file + `dns-update` script + `dns-update.service` (oneshot) + `dns-update.path` (watcher). The script sends only the delta since last run and deletes removed records, grouped per zone.
- **profiles::dns::record**: writes a local concat fragment (`zone|name|type|ttl|value`) instead of exporting `@@concat::fragment` to the master.
- **profiles::dns::base**: includes `profiles::dns::updater` (all nodes).
- **hiera**: `profiles::dns::updater` server/key_name/algorithm in common.yaml.
## Inert until keyed
The updater does nothing until `profiles::dns::updater::key_secret` (TSIG) is set in eyaml — records are assembled but not applied, so nodes are safe before the key exists.
## Prerequisites (k8s side, separate)
1. The `bind-authoritative` zones must set `dynamicUpdate: true` + an `updateKeyRef` (a client-update BindTSIGKey) so they accept these updates.
2. The TSIG key must be shared: the operator-generated key value goes into eyaml here (or the planned Vault-sync feature bridges it).
## Validated
puppet parser/epp validate, puppet-lint, and a functional test of the generated per-zone nsupdate message (replace + delete-removed).
Reviewed-on: #475
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>
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