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SNI Routing

View the full demo in realtime​

You can either follow all the steps manually, or watch the recording

Review the docker compose environment​

As can be seen from docker-compose.yaml the demo environment consists of the following services:

  • gateway1
  • gateway2
  • kafka-client
  • kafka1
  • kafka2
  • kafka3
  • schema-registry
  • zookeeper
cat docker-compose.yaml


rm *jks *key *p12 *crt

openssl req \
  -x509 \
  -newkey rsa:4096 \
  -sha256 \
  -days 3560 \
  -nodes \
  -keyout san.key \
  -out san.crt \
  -subj '/CN=username' \
  -extensions san \
  -config openssl.config

  openssl pkcs12 \
    -export \
    -in san.crt \
    -inkey san.key \
    -name brokers \
    -out san.p12 \
    -password "pass:123456"

  keytool \
    -noprompt \
    -alias brokers \
    -importkeystore \
    -deststorepass 123456 \
    -destkeystore keystore.jks \
    -srckeystore san.p12 \
    -srcstoretype PKCS12 \
    -srcstorepass 123456

  keytool \
    -noprompt \
    -import \
    -alias brokers \
    -file san.crt \
    -keypass 123456 \
    -destkeystore truststore.jks \
    -storepass 123456

echo """
security.protocol=SSL
ssl.truststore.location=/clientConfig/truststore.jks
ssl.truststore.password=123456
""" > client.config

Starting the docker environment​

Start all your docker processes, wait for them to be up and ready, then run in background

  • --wait: Wait for services to be running|healthy. Implies detached mode.
  • --detach: Detached mode: Run containers in the background
docker compose up --detach --wait

Create a topic​

docker compose exec kafka-client \
  kafka-topics \
    --bootstrap-server broker-sni-gateway1main1.gateway-sni.conduktor.local:6969 \
    --create \
    --replication-factor 3 \
    --partitions 1 \
    --topic clientTopic \
    --command-config /clientConfig/client.config

Produce a record to clientTopic using gateway1​

echo "Hello world 1" | docker compose exec -i kafka-client \
  kafka-console-producer \
    --bootstrap-server broker-sni-gateway1main1.gateway-sni.conduktor.local:6969 \
    --topic clientTopic \
    --producer.config /clientConfig/client.config

Produce a record to clientTopic using gateway2​

echo "Hello world 2" | docker compose exec -i kafka-client \
  kafka-console-producer \
    --bootstrap-server broker-sni-gateway2main2.gateway-sni.conduktor.local:6969 \
    --topic clientTopic \
    --producer.config /clientConfig/client.config

Consume records from clientTopic​

docker compose exec kafka-client \
  kafka-console-consumer \
    --bootstrap-server broker-sni-gateway1main3.gateway-sni.conduktor.local:6969 \
    --topic clientTopic \
    --from-beginning \
    --max-messages 2 \
    --consumer.config /clientConfig/client.config

Tearing down the docker environment​

Remove all your docker processes and associated volumes

  • --volumes: Remove named volumes declared in the "volumes" section of the Compose file and anonymous volumes attached to containers.
docker compose down --volumes