A fresh project named
debezium is prepared with the necessary resources required to execute the deployment.
There are multiple resources created for you in the home directory, the project itself or configured in OpenShift
- a cloned repository of Strimzi project
- Strimzi Cluster Controller managing Kafka brokers
- MySQL instance containing a small set of data to be streamed
- templates used to deploy components
1. Run the following commands to switch to
debezium project and explore it.
If you click on command it gets automatically copied it into the terminal and is executed
oc project debezium
Check that MySQL instance is running
oc get pods
and that it is exposed as a service
oc get svc
The diagram of deployment now looks like
2. Deploy Kafka broker with ZooKeeper.
The first component to deploy is a Kafka broker.
The templates by default deploy Kafka broker and ZooKeeper in a high-available configuration with replication factor
This is not necessary in the development environment so we reduce the number of nodes and replication factor for system topics to
We also deploy an ephemeral variant of the broker. You should use persistent variant in production.
To deploy the broker issue a command
oc new-app strimzi-ephemeral -p ZOOKEEPER_NODE_COUNT=1 -p KAFKA_NODE_COUNT=1 -p KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR=1 -p KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR=1
Now let's wait till both ZooKeeper and Kafka broker are deployed
oc get pods -w
The final list of pods should be similar to
NAME READY STATUS RESTARTS AGE my-cluster-kafka-0 1/1 Running 0 2m my-cluster-topic-controller-4124062197-l9lq4 1/1 Running 0 1m my-cluster-zookeeper-0 1/1 Running 0 3m mysql-1-84j4w 1/1 Running 0 10m strimzi-cluster-controller-2044197322-cpmb9 1/1 Running 0 10m
Note: Kafka depends on ZooKeeper so intermittent Kafka failures are expected as ZooKeeper might not be initialized at the time of Kafka start.
New services are available
oc get svc -l app=strimzi-ephemeral
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE my-cluster-kafka 172.30.243.180 <none> 9092/TCP,9091/TCP 1m my-cluster-kafka-headless None <none> 9092/TCP,9091/TCP 1m my-cluster-zookeeper 172.30.147.222 <none> 2181/TCP 2m my-cluster-zookeeper-headless None <none> 2181/TCP,2888/TCP,3888/TCP 2m
3. Verify the broker is up and running.
Note: The complete initialization of all components can take a couple of minutes. Please make sure that all pods are in Running state and are Ready before you try the next steps.
A successful attempt to send a message to (no output expected here)
echo "Hello world" | oc exec -i my-cluster-kafka-0 -- /opt/kafka/bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test
and receive a message from
oc exec my-cluster-kafka-0 -- /opt/kafka/bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic test --from-beginning --max-messages 1
the deployed broker indicates that it is available.
You have now successfully executed the first step in this scenario.
You have successfully deployed Kafka broker service and made it available to clients to produce and consume messages.
In the next step of this scenario, we will deploy a single instance of Debezium.