Expose an env variable to allow the auto creation of topics to be tur…

…ned off to more closely resemble production behavior.

Dockerfile

@@ -8,6 +8,7 @@ ARG scalaversion=2.13
 ENV KRAFT_CONTAINER_HOST_NAME=
 ENV KRAFT_CREATE_TOPICS=
 ENV KRAFT_PARTITIONS_PER_TOPIC=
+ENV KRAFT_AUTO_CREATE_TOPICS=
 
 RUN apk --no-cache add curl bash
 

README.md

@@ -10,11 +10,12 @@ Apache Kafka Docker image using using Kafka Raft metadata mode (KRaft). In KRaft
 
 ```bash
 $ docker pull moeenz/docker-kafka-kraft
-$ docker run -e KRAFT_CONTAINER_HOST_NAME=kafka -e KRAFT_CREATE_TOPICS=topic-a,topic-b,topic-c -e KRAFT_PARTITIONS_PER_TOPIC=3 moeenz/docker-kafka-kraft
+$ docker run -e KRAFT_CONTAINER_HOST_NAME=kafka -e KRAFT_CREATE_TOPICS=topic-a,topic-b,topic-c -e KRAFT_PARTITIONS_PER_TOPIC=3 -e KRAFT_AUTO_CREATE_TOPICS=true moeenz/docker-kafka-kraft
 ```
 
 - Now you can reach the container at `localhost:9093` on your host machine or inside Docker network with hostname `kafka`.
 - Comma seperated values received by `KRAFT_CREATE_TOPICS` env will be used to create topics at startup time.
+- The `KRAFT_AUTO_CREATE_TOPICS` env variable lets you turn off auto topic creation (`auto.create.topics.enable=false`). Default Kafka behavior is `true`. 
 
 ### Compose Example
 
@@ -29,6 +30,7 @@ services:
       - KRAFT_CONTAINER_HOST_NAME=kafka
       - KRAFT_CREATE_TOPICS=topic-a,topic-b,topic-c
       - KRAFT_PARTITIONS_PER_TOPIC=3
+      - KRAFT_AUTO_CREATE_TOPICS=true
 ```
 
 ## Environment Variables
@@ -38,6 +40,7 @@ services:
 | KRAFT_CONTAINER_HOST_NAME  | string   | Hostname for the running container as the Kafka listener       | kafka                   |
 | KRAFT_CREATE_TOPICS        | []string | Comma separated list of topics to be created post server setup | topic-a,topic-b,topic-c |
 | KRAFT_PARTITIONS_PER_TOPIC | int      | Number of partitions per topic                                 | 3                       |
+| KRAFT_AUTO_CREATE_TOPICS   | string   | `true` or `false`, Kafka default behavior is `true`.           | false                    |
 
 ## Resources
 

docker-entrypoint.sh

@@ -12,6 +12,12 @@ kafka_addr=localhost:9093;
 
 echo "==> Applying environment variables...";
 
+if [ -z $KRAFT_AUTO_CREATE_TOPICS ]; then
+    echo "==> Not setting auto.create.topics.enable (default; environment variable not set)."
+else
+    echo "==> Setting auto.create.topics.enable=${KRAFT_AUTO_CREATE_TOPICS}...";
+    echo "auto.create.topics.enable=${KRAFT_AUTO_CREATE_TOPICS}" >> $properties_file;
+fi
 
 if [ -z $KRAFT_CONTAINER_HOST_NAME ]; then
     echo "listeners=CONTROLLER://:19092,EXTERNAL://:9093" >> $properties_file;

examples/docker-compose.yml

@@ -8,3 +8,4 @@ services:
       - KRAFT_CONTAINER_HOST_NAME=kafka
       - KRAFT_CREATE_TOPICS=topic-a,topic-b,topic-c
       - KRAFT_PARTITIONS_PER_TOPIC=3
+      - KRAFT_AUTO_CREATE_TOPICS=true