Minor improvements to examples docker compose file

docs/examples/docker-compose.yml

@@ -1,5 +1,3 @@
-version: "3.9"  # optional since v1.27.0
-
 volumes:
   powerdns-db-data:
     name: powerdns-db-data
@@ -16,8 +14,8 @@ services:
   powerdns:
     image: psitrax/powerdns
     ports:
-      - "53:53/tcp"
-      - "53:53/udp"
+      - "${PORT:-53}:53/tcp"
+      - "${PORT:-53}:53/udp"
       - "8081:8081"
     environment:
       MYSQL_HOST: db
@@ -26,4 +24,4 @@ services:
       MYSQL_PASS: l3tmein
     depends_on:
       - db
-    command: --api=yes --api-key=its@secret --loglevel=99 --webserver=yes --webserver-address=0.0.0.0 --webserver-allow-from=0.0.0.0/0 --webserver-password=its@secret --webserver-port=8081 --enable-lua-records=shared --edns-subnet-processing=yes
+    command: --api=yes --api-key=its@secret --loglevel=99 --log-dns-queries=yes --webserver=yes --webserver-address=0.0.0.0 --webserver-allow-from=0.0.0.0/0 --webserver-password=its@secret --webserver-port=8081 --enable-lua-records=shared --edns-subnet-processing=yes

docs/examples/env.sh

@@ -1 +1,3 @@
 export POWERDNS_API_KEY="its@secret"
+# you may need to change this to something else if there's already a DNS server running on your system
+export PORT=53