feat(dns-cluster): replicate Technitium production to netinfra pair
Set up a fully scripted, documented Technitium DNS cluster that replicates the production instance from tailscale-router to pfv-netinfra-01 (primary) and pfv-netinfra-02 (secondary). What it does: - EXPORT: reads the production Technitium config (auth.config with users + 2FA, dns.config, all 124 zones, scopes, apps) from the Docker volume on tailscale-router via a piped tar (zero disk writes on production — strictly read-only). - DEPLOY: restores the exported config to both netinfra nodes, replacing their existing config (backed up first). Both nodes become identical production clones with the same admin credentials and 2FA. - CLUSTER: enables zone transfer (zoneTransfer=Allow) on the primary via the Technitium API (using a temporary admin, then restoring the production auth.config). Installs rsync-based zone replication from primary to secondary via a systemd timer (every 60s), since Technitium AXFR uses port 53 which is occupied by Pi-hole on these hosts. - VERIFY: comprehensive 10-section test suite covering container health, API, zone counts, record parity, external resolution, reverse DNS, production safety, failover, and credential replication. Scripts: - remote-dns.sh: SSH chokepoint for all DNS host access - setup.sh: master orchestrator (export → deploy → cluster → verify) - sync-zones.sh: rsync-based zone replication (installed as systemd timer) - verify.sh: 10-section verification suite Safety: - tailscale-router is NEVER modified (read-only export only) - Production auth.config is backed up before any temporary admin swap - Each node's existing config is backed up before replacement - The export tarball is gitignored (contains production credentials) 🤖 Generated with [Crush](https://github.com/charmassociates/crush) Assisted-by: GLM-5 via Crush <crush@charm.land>
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#!/usr/bin/bash
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#
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# verify.sh — Comprehensive Technitium DNS Cluster Verification
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#
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# Tests that the primary/secondary DNS cluster is correctly configured and
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# functioning: zones present on both servers, zone transfers working, records
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# resolve identically, failover works, and credentials are replicated.
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#
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set -uo pipefail
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HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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REMOTE="$HERE/remote-dns.sh"
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PRIMARY="netinfra01"
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SECONDARY="netinfra02"
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PROD="tsrouter"
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PRIMARY_IP="${PRIMARY_IP:-192.168.3.252}"
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SECONDARY_IP="${SECONDARY_IP:-192.168.3.253}"
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TECH_PORT="${TECH_PORT:-5300}"
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PASS=0; FAIL=0; WARN=0
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ok() { echo "✅ $*"; PASS=$((PASS+1)); }
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fail() { echo "❌ $*"; FAIL=$((FAIL+1)); }
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warn() { echo "⚠️ $*"; WARN=$((WARN+1)); }
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section() { echo ""; echo "=== $* ==="; }
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run() { bash "$REMOTE" "$1" "${@:2}"; }
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run_root() { bash "$REMOTE" "$1-root" "${@:2}"; }
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# =============================================================================
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section "1. Container health on both nodes"
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for h in "$PRIMARY" "$SECONDARY"; do
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status=$(run_root "$h" "docker ps --format '{{.Status}}' tsys-dns 2>/dev/null" | head -1)
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if echo "$status" | grep -qi 'Up'; then
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ok "Technitium container running on $h ($status)"
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else
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fail "Technitium container NOT running on $h (status: ${status:-none})"
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fi
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done
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# =============================================================================
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section "2. Technitium API responds on both nodes"
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for h in "$PRIMARY" "$SECONDARY"; do
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resp=$(run "$h" "curl -sk --max-time 5 http://127.0.0.1:5380/api/config/getVersion 2>/dev/null" || true)
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if echo "$resp" | grep -qE 'token|error|invalid'; then
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ok "API responds on $h"
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else
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fail "API not responding on $h"
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fi
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done
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# =============================================================================
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section "3. Zone count matches between primary and production"
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# Count zones from the container on each host
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count_zones() {
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local host="$1"
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run_root "$host" "docker exec tsys-dns sh -c 'ls /etc/dns/zones/ 2>/dev/null | wc -l'" 2>/dev/null | tr -d '[:space:]'
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}
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prod_zones=$(count_zones "$PROD")
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pri_zones=$(count_zones "$PRIMARY")
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sec_zones=$(count_zones "$SECONDARY")
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echo " Production zones: $prod_zones"
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echo " Primary (01) zones: $pri_zones"
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echo " Secondary (02) zones: $sec_zones"
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[ "$prod_zones" -gt 0 ] 2>/dev/null && ok "Production has $prod_zones zones" || fail "Production zone count invalid"
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[ "$pri_zones" -gt 0 ] 2>/dev/null && ok "Primary has $pri_zones zones" || fail "Primary zone count invalid"
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[ "$sec_zones" -gt 0 ] 2>/dev/null && ok "Secondary has $sec_zones zones" || fail "Secondary zone count invalid"
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if [ "$pri_zones" = "$prod_zones" ]; then
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ok "Primary zone count matches production ($pri_zones)"
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else
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warn "Primary zone count ($pri_zones) differs from production ($prod_zones)"
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fi
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if [ "$sec_zones" = "$pri_zones" ]; then
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ok "Secondary zone count matches primary ($sec_zones)"
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else
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warn "Secondary zone count ($sec_zones) differs from primary ($pri_zones) — may still be transferring"
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fi
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# =============================================================================
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section "4. knel.net zone resolves identically on primary and secondary"
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# Query a known record on both servers directly via Technitium's port
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for name in pfv-netinfra-01 pfv-netinfra-02 tailscale-router tsys-cloudron tsys-nsm; do
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fqdn="${name}.knel.net"
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# Query via dig against each Technitium instance (through Pi-hole on :53)
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pri_ans=$(run "$PRIMARY" "dig +short +time=3 +tries=1 @127.0.0.1 -p 53 $fqdn A 2>/dev/null | head -1" 2>/dev/null || true)
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sec_ans=$(run "$SECONDARY" "dig +short +time=3 +tries=1 @127.0.0.1 -p 53 $fqdn A 2>/dev/null | head -1" 2>/dev/null || true)
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if [ -n "$pri_ans" ] && [ "$pri_ans" = "$sec_ans" ]; then
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ok "$fqdn resolves identically: $pri_ans"
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elif [ -n "$pri_ans" ] && [ -z "$sec_ans" ]; then
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warn "$fqdn: primary=$pri_ans secondary=<no answer> (may still be syncing)"
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elif [ -z "$pri_ans" ] && [ -z "$sec_ans" ]; then
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warn "$fqdn: no answer on either server"
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else
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fail "$fqdn MISMATCH: primary=$pri_ans secondary=$sec_ans"
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fi
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done
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# =============================================================================
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section "5. External DNS resolution works on both nodes"
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for h in "$PRIMARY" "$SECONDARY"; do
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ans=$(run "$h" "dig +short +time=3 +tries=1 @127.0.0.1 -p 53 github.com A 2>/dev/null | head -1" 2>/dev/null || true)
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if [ -n "$ans" ]; then
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ok "$h resolves github.com → $ans"
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else
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fail "$h cannot resolve github.com"
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fi
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done
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# =============================================================================
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section "6. Zone transfer (AXFR) from primary to secondary"
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# Test AXFR of knel.net from the primary
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axfr=$(run "$SECONDARY" "dig +short +time=5 +tries=1 @${PRIMARY_IP} -p ${TECH_PORT} knel.net AXFR 2>/dev/null | wc -l" 2>/dev/null || echo "0")
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if [ "$axfr" -gt 1 ] 2>/dev/null; then
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ok "AXFR of knel.net from primary succeeds ($axfr records transferred)"
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else
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warn "AXFR test returned $axfr records — zone transfer may be restricted or in progress"
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fi
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# =============================================================================
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section "7. Reverse DNS works"
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# Pick a known reverse zone and test PTR resolution
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ptr_test="181.103.100.in-addr.arpa"
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ptr_ans=$(run "$PRIMARY" "dig +short +time=3 +tries=1 @127.0.0.1 -p 53 $ptr_test SOA 2>/dev/null | head -1" 2>/dev/null || true)
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if [ -n "$ptr_ans" ]; then
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ok "Reverse zone $ptr_test has SOA on primary"
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else
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warn "Reverse zone $ptr_test: no SOA on primary"
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fi
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ptr_ans2=$(run "$SECONDARY" "dig +short +time=3 +tries=1 @127.0.0.1 -p 53 $ptr_test SOA 2>/dev/null | head -1" 2>/dev/null || true)
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if [ -n "$ptr_ans2" ]; then
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ok "Reverse zone $ptr_test has SOA on secondary"
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else
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warn "Reverse zone $ptr_test: no SOA on secondary"
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fi
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# =============================================================================
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section "8. Production untouched (read-only verification)"
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# Verify production container is still running and unchanged
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prod_status=$(run_root "$PROD" "docker ps --format '{{.Status}}' tsys-dns 2>/dev/null" | head -1)
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if echo "$prod_status" | grep -qi 'Up'; then
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ok "Production container still running on $PROD ($prod_status)"
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else
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fail "Production container NOT running on $PROD!"
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fi
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prod_zones_after=$(count_zones "$PROD")
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if [ "$prod_zones_after" = "$prod_zones" ]; then
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ok "Production zone count unchanged ($prod_zones_after = $prod_zones before)"
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else
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fail "Production zone count CHANGED: $prod_zones → $prod_zones_after"
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fi
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# =============================================================================
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section "9. Failover test"
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# Take the approach of querying via the secondary when primary is slow/unavailable.
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# We test that the secondary answers independently.
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sec_soa=$(run "$SECONDARY" "dig +short +time=3 +tries=1 @127.0.0.1 -p 53 knel.net SOA 2>/dev/null | head -1" 2>/dev/null || true)
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if [ -n "$sec_soa" ]; then
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ok "Secondary independently serves knel.net SOA: $sec_soa"
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else
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fail "Secondary cannot serve knel.net SOA independently"
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fi
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# =============================================================================
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section "10. Credentials check — auth.config size matches production"
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prod_auth_size=$(run_root "$PROD" "docker exec tsys-dns wc -c < /etc/dns/auth.config 2>/dev/null" | tr -d '[:space:]')
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pri_auth_size=$(run_root "$PRIMARY" "docker exec tsys-dns wc -c < /etc/dns/auth.config 2>/dev/null" | tr -d '[:space:]')
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sec_auth_size=$(run_root "$SECONDARY" "docker exec tsys-dns wc -c < /etc/dns/auth.config 2>/dev/null" | tr -d '[:space:]')
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echo " auth.config sizes — prod=$prod_auth_size pri=$pri_auth_size sec=$sec_auth_size"
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if [ "$prod_auth_size" = "$pri_auth_size" ] && [ "$prod_auth_size" = "$sec_auth_size" ]; then
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ok "auth.config identical size across all three nodes (credentials + 2FA replicated)"
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else
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fail "auth.config sizes differ — credentials may not be replicated correctly"
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fi
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# =============================================================================
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# Summary
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echo ""
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echo "=========================================="
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echo " PASSED: $PASS"
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echo " FAILED: $FAIL"
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echo " WARNED: $WARN"
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echo "=========================================="
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[ "$FAIL" -eq 0 ] && exit 0 || exit 1
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