Add DDNS CronJob and secret creation script for Porkbun integration

.env.example

@@ -1,6 +1,6 @@
 # Porkbun API credentials
 PORKBUN_API_KEY=pk1_your_key_here
-PORKBUN_SECRET_API_KEY=sk1_your_key_here
+PORKBUN_SECRET_KEY=sk1_your_key_here
 
 # K3s node token for agent join
 K3S_NODE_TOKEN=your_token_here

manifests/ddns-cronjob.yaml

@@ -0,0 +1,97 @@
+# DDNS CronJob — updates home.nik4nao.com on Porkbun every 5 minutes
+# Requires: porkbun-ddns secret in ddns namespace
+# Apply: kubectl apply -f manifests/ddns-cronjob.yaml
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: ddns
+---
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: porkbun-ddns
+  namespace: ddns
+spec:
+  schedule: "*/5 * * * *"
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          restartPolicy: OnFailure
+          containers:
+            - name: ddns
+              image: alpine:latest
+              env:
+                - name: PORKBUN_API_KEY
+                  valueFrom:
+                    secretKeyRef:
+                      name: porkbun-ddns
+                      key: api-key
+                - name: PORKBUN_SECRET_KEY
+                  valueFrom:
+                    secretKeyRef:
+                      name: porkbun-ddns
+                      key: secret-api-key
+              command:
+                - /bin/sh
+                - -c
+                - |
+                  set -euo pipefail
+                  apk add --no-cache curl jq bind-tools -q
+
+                  DOMAIN="nik4nao.com"
+                  RECORD_NAME="home"
+                  TTL=300
+
+                  timestamp() { date +"%Y-%m-%d %H:%M:%S%z"; }
+
+                  # Get current WAN IP
+                  WAN_IP="$(curl -sf https://api.ipify.org)"
+                  if [ -z "$WAN_IP" ]; then
+                    echo "[$(timestamp)] ERROR: Could not detect WAN IP"
+                    exit 1
+                  fi
+                  echo "[$(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 -> $WAN_IP, updating..."
+
+                  # Retrieve existing records to get record ID
+                  RECORDS="$(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==$name) | .id' | head -1)"
+
+                  if [ -z "$RECORD_ID" ]; then
+                    # Create new record
+                    echo "[$(timestamp)] No existing record, creating..."
+                    RESP="$(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
+                    echo "[$(timestamp)] Updating record ID $RECORD_ID..."
+                    RESP="$(curl -sf -X POST \
+                      "https://api.porkbun.com/api/json/v3/dns/edit/${DOMAIN}/${RECORD_ID}" \
+                      -H 'Content-Type: application/json' \
+                      -d "{\"apikey\":\"$PORKBUN_API_KEY\",\"secretapikey\":\"$PORKBUN_SECRET_KEY\",\"type\":\"A\",\"name\":\"$RECORD_NAME\",\"content\":\"$WAN_IP\",\"ttl\":$TTL}")"
+                  fi
+
+                  echo "[$(timestamp)] Response: $(echo "$RESP" | jq -c .)"
+                  echo "$RESP" | grep -q '"status":"SUCCESS"' && \
+                    echo "[$(timestamp)] Update successful" || \
+                    echo "[$(timestamp)] Update failed"

manifests/ddns-secret.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+# Usage: bash manifests/ddns-secret.sh
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ENV_FILE="$SCRIPT_DIR/../.env"
+
+if [ ! -f "$ENV_FILE" ]; then
+  echo "Error: .env file not found"
+  exit 1
+fi
+
+source "$ENV_FILE"
+
+kubectl create secret generic porkbun-ddns \
+  --namespace ddns \
+  --from-literal=api-key="$PORKBUN_API_KEY" \
+  --from-literal=secret-api-key="$PORKBUN_SECRET_KEY" \
+  --dry-run=client -o yaml | kubectl apply -f -
+
+echo "Secret applied"