# Kafka on Kubernetes

Transparent Kafka setup that you can grow with.
Good for both experiments and production.

How to use:
 * Run a Kubernetes cluster, [minikube](https://github.com/kubernetes/minikube) or real.
 * To quickly get a small Kafka cluster running, use the `kubectl apply`s below.
 * To start using Kafka for real, fork and have a look at [addon](https://github.com/Yolean/kubernetes-kafka/labels/addon)s.
 * Join the discussion here in issues and PRs.

Why?
See for yourself. No single readable readme can properly introduce both Kafka and Kubernets.
Back when we read [Newman](http://samnewman.io/books/building_microservices/) we were beginners with both.
Now we read [Kleppmann](http://dataintensive.net/), [Confluent's blog](https://www.confluent.io/blog/) and [SRE](https://landing.google.com/sre/book.html) and enjoy this "Streaming Platform" lock-in :smile:.

## What you get

[Bootstrap servers](http://kafka.apache.org/documentation/#producerconfigs): `kafka-0.broker.kafka.svc.cluster.local:9092,kafka-1.broker.kafka.svc.cluster.local:9092,kafka-2.broker.kafka.svc.cluster.local:9092`
`

Zookeeper at `zookeeper.kafka.svc.cluster.local:2181`.

## Set up Zookeeper

The [Kafka book](https://www.confluent.io/resources/kafka-definitive-guide-preview-edition/) recommends that Kafka has its own Zookeeper cluster with at least 5 instances.

```
kubectl create -f ./zookeeper/
```

To support automatic migration in the face of availability zone unavailability :wink: we mix persistent and ephemeral storage.

## Start Kafka

```
kubectl create -f ./
```

You might want to verify in logs that Kafka found its own DNS name(s) correctly. Look for records like:
```
kubectl -n kafka logs kafka-0 | grep "Registered broker"
# INFO Registered broker 0 at path /brokers/ids/0 with addresses: PLAINTEXT -> EndPoint(kafka-0.broker.kafka.svc.cluster.local,9092,PLAINTEXT)
```