NOMAD replica deployment is documented here for historical reference; only the RPi4 replica remains optional future work if you ever revive a separate backup-DNS design.

Files

docker-compose.yaml — primary-node stack
.env.example — required variables
unbound.conf — shared recursive resolver config
keepalived.conf.template — rendered into keepalived.conf
bin/render_keepalived_conf.py — generates keepalived.conf from .env
bin/prepare_pd.sh — creates appdata dirs, downloads root hints, renders config, validates compose, optional --up

First-time setup on PD

cd /mnt/docker-ssd/docker/compose/pihole
cp .env.example .env
nano .env   # set real passwords + verify LAN_INTERFACE
/usr/bin/bash bin/prepare_pd.sh

If that validates cleanly, bring it up:

/usr/bin/bash bin/prepare_pd.sh --up

Retired topology snapshot

PD primary
- service root: /mnt/docker-ssd/docker/compose/pihole
- Pi-hole container: pihole-primary
- Unbound container: unbound-pihole-primary
- Keepalived container: keepalived-pihole-primary
- Nebula Sync container: nebula-sync
- LAN admin URL: http://10.5.30.6:8953/admin/
NOMAD backup
- service root: /opt/pihole-nomad
- Pi-hole container: pihole-nomad
- Unbound container: unbound-pihole-nomad
- Keepalived container: keepalived-pihole-nomad (staged, disabled by default)
- LAN admin URL: http://10.5.30.7:8954/admin/
VIP for client DNS: 10.5.30.53
Shared Pi-hole admin password: stored in the local .env files; Nebula and both nodes use the same current value.

Important notes

This stack is no longer live. Keep it only as a historical build/repair reference.
KEEPALIVED_PASSWORD must be 8 chars or fewer because VRRP PASS auth is annoying and old.
Verify LAN_INTERFACE on PD before deployment (ip link show).
FTLCONF_dns_listeningMode=LOCAL is set because TrueNAS binds loopback on port 53.
Pi-hole NTP is explicitly disabled here because PD host chronyd already owns UDP 123.
Nebula Sync runs on PD and uses NEBULA_SYNC_PRIMARY / NEBULA_SYNC_REPLICAS from .env.
Current replica target is NOMAD at http://10.5.30.7:8954.
NOMAD no longer participates in the old Trusted-side 10.5.30.53/24 Keepalived VIP after moving to Servers VLAN. Re-enable Keepalived there only after a same-subnet HA design exists.
Nebula Sync is intentionally set to selective mode with gravity sync toggles enabled for groups, adlists, and domain lists so replica-specific runtime/network settings are not clobbered.
keepalived.conf is generated and should stay local/untracked.