add kafka for dev

doc/kafka.md

@@ -0,0 +1,49 @@
+# Kafka
+
+## Creat topic 
+
+### Create Client Properties
+
+Run this inside the container.
+
+```shell
+cat <<EOF > /tmp/client.properties
+security.protocol=SASL_PLAINTEXT
+sasl.mechanism=PLAIN
+sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required \
+username="<CLIENT_USERNAME>" \
+password="<CLIENT_PASSWORD>";
+EOF
+```
+
+### Create Topic
+
+Create custom topic, set `topic` name to be used and `retention.ms` time to live in millisecond
+
+```shell
+kafka-topics.sh \
+--create \
+--bootstrap-server localhost:9092 \
+--topic <TOPIC> \
+--partitions 1 \
+--replication-factor 1 \
+--config retention.ms=<TTL MS> \
+--command-config /tmp/client.properties
+```
+
+### List Topic
+
+Get a list of all topics
+
+```shell
+kafka-topics.sh \
+--bootstrap-server localhost:9092 \
+--command-config /tmp/client.properties \
+--list
+```
+
+### Access Kafka in K8s
+
+```shell
+kubectl -n hlaeja-testing exec -it dependency-kafka-controller-0 -- /bin/bash
+```