# Kubernetes Controller

The JetStream controllers allow you to manage NATS JetStream Streams and Consumers via K8S CRDs. You can find more info on how to deploy and usage [here](https://github.com/nats-io/nack#getting-started). Below you can find an example of how to create a stream and a couple of consumers:

```yaml
---
apiVersion: jetstream.nats.io/v1beta1
kind: Stream
metadata:
  name: mystream
spec:
  name: mystream
  subjects: ["orders.*"]
  storage: memory
  maxAge: 1h
---
apiVersion: jetstream.nats.io/v1beta1
kind: Consumer
metadata:
  name: my-push-consumer
spec:
  streamName: mystream
  durableName: my-push-consumer
  deliverSubject: my-push-consumer.orders
  deliverPolicy: last
  ackPolicy: none
  replayPolicy: instant
---
apiVersion: jetstream.nats.io/v1beta1
kind: Consumer
metadata:
  name: my-pull-consumer
spec:
  streamName: mystream
  durableName: my-pull-consumer
  deliverPolicy: all
  filterSubject: orders.received
  maxDeliver: 20
  ackPolicy: explicit
```

Once the CRDs are installed you can use `kubectl` to manage the streams and consumers as follows:

```bash
$ kubectl get streams
NAME       STATE     STREAM NAME   SUBJECTS
mystream   Created   mystream      [orders.*]

$ kubectl get consumers
NAME               STATE     STREAM     CONSUMER           ACK POLICY
my-pull-consumer   Created   mystream   my-pull-consumer   explicit
my-push-consumer   Created   mystream   my-push-consumer   none

# If you end up in an Errored state, run kubectl describe for more info.
#     kubectl describe streams mystream
#     kubectl describe consumers my-pull-consumer
```


---

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