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Refactor DDNS CronJob to improve DNS record handling and remove duplicates

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This commit is contained in:
Nik Afiq 2026-03-10 19:50:07 +09:00
parent fb09e4198d
commit 4da33ceaed
1 changed files with 46 additions and 21 deletions
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67
manifests/ddns-cronjob.yaml
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@ -39,10 +39,11 @@ spec:
- -c
- |
set -euo pipefail
apk add --no-cache curl jq bind-tools -q
apk add --no-cache curl jq -q
DOMAIN="nik4nao.com"
RECORD_NAME="home"
RECORD_FQDN="${RECORD_NAME}.${DOMAIN}"
TTL=300
timestamp() { date +"%Y-%m-%d %H:%M:%S%z"; }
@ -55,37 +56,61 @@ spec:
fi
echo "[$(timestamp)] WAN IP: $WAN_IP"
# Get current DNS record via dig
DNS_IP="$(dig +short ${RECORD_NAME}.${DOMAIN} @1.1.1.1 | head -1)"
echo "[$(timestamp)] DNS IP: $DNS_IP"
# Skip if unchanged
if [ "$WAN_IP" = "$DNS_IP" ]; then
echo "[$(timestamp)] No change, skipping."
exit 0
fi
echo "[$(timestamp)] IP changed $DNS_IP -> $WAN_IP, updating..."
# Retrieve existing records to get record ID
# Get current DNS records from Porkbun API
RECORDS="$(curl -sf -X POST \
"https://api.porkbun.com/api/json/v3/dns/retrieve/${DOMAIN}" \
-H 'Content-Type: application/json' \
-d "{\"apikey\":\"$PORKBUN_API_KEY\",\"secretapikey\":\"$PORKBUN_SECRET_KEY\"}")"
RECORD_ID="$(echo "$RECORDS" | jq -r \
--arg name "$RECORD_NAME" \
'.records[] | select(.type=="A" and .name==$name) | .id' | head -1)"
# Get all A record IDs for this subdomain
RECORD_IDS="$(echo "$RECORDS" | jq -r \
--arg fqdn "$RECORD_FQDN" \
'.records[] | select(.type=="A" and .name==$fqdn) | .id')"
if [ -z "$RECORD_ID" ]; then
# Create new record
echo "[$(timestamp)] No existing record, creating..."
# Get the current DNS IP from the first record
DNS_IP="$(echo "$RECORDS" | jq -r \
--arg fqdn "$RECORD_FQDN" \
'.records[] | select(.type=="A" and .name==$fqdn) | .content' | head -1)"
echo "[$(timestamp)] DNS IP: ${DNS_IP:-none}"
# Delete all stale duplicate records (keep none — we'll create/update cleanly)
RECORD_COUNT="$(echo "$RECORD_IDS" | grep -c . || true)"
if [ "$RECORD_COUNT" -gt 1 ]; then
echo "[$(timestamp)] Found $RECORD_COUNT duplicate records, deleting all..."
for ID in $RECORD_IDS; do
curl -sf -X POST \
"https://api.porkbun.com/api/json/v3/dns/delete/${DOMAIN}/${ID}" \
-H 'Content-Type: application/json' \
-d "{\"apikey\":\"$PORKBUN_API_KEY\",\"secretapikey\":\"$PORKBUN_SECRET_KEY\"}" > /dev/null
echo "[$(timestamp)] Deleted record ID $ID"
done
DNS_IP=""
fi
# Get the single remaining record ID (if any)
RECORD_ID="$(echo "$RECORDS" | jq -r \
--arg fqdn "$RECORD_FQDN" \
'.records[] | select(.type=="A" and .name==$fqdn) | .id' | head -1)"
# Skip if already correct (single record, correct IP)
if [ "$RECORD_COUNT" -le 1 ] && [ "$WAN_IP" = "$DNS_IP" ]; then
echo "[$(timestamp)] No change, skipping."
exit 0
fi
echo "[$(timestamp)] IP changed ${DNS_IP:-none} -> $WAN_IP, updating..."
if [ -z "$RECORD_ID" ] || [ "$RECORD_COUNT" -gt 1 ]; then
# Create fresh record
echo "[$(timestamp)] Creating new record..."
RESP="$(curl -sf -X POST \
"https://api.porkbun.com/api/json/v3/dns/create/${DOMAIN}" \
-H 'Content-Type: application/json' \
-d "{\"apikey\":\"$PORKBUN_API_KEY\",\"secretapikey\":\"$PORKBUN_SECRET_KEY\",\"type\":\"A\",\"name\":\"$RECORD_NAME\",\"content\":\"$WAN_IP\",\"ttl\":$TTL}")"
else
# Update existing record
# Update existing single record
echo "[$(timestamp)] Updating record ID $RECORD_ID..."
RESP="$(curl -sf -X POST \
"https://api.porkbun.com/api/json/v3/dns/edit/${DOMAIN}/${RECORD_ID}" \