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Setup NATS

Locally

You can run a NATS server locally using Docker:

docker run -d --name nats-main -p 4222:4222 -p 6222:6222 -p 8222:8222 nats

You can then interact with the server using the client port: localhost:4222.

Kubernetes

The easiest way to install NATS on Kubernetes is by using the Helm chart:

helm install nats stable/nats

This will install NATS into the default namespace. To interact with NATS, find the service with: kubectl get svc nats-client.

For example, if installing using the example above, the NATS server client address would be:

nats-client.default.svc.cluster.local:4222

Create a Dapr component

The next step is to create a Dapr component for NATS.

Create the following YAML file named nats.yaml:

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <name>
spec:
  type: pubsub.nats
  metadata:
  - name: natsURL
    value: <REPLACE-WITH-NATS-SERVER-ADDRESS> # Required. Example: "nats-client.default.svc.cluster.local:4222"

The above example uses secrets as plain strings. It is recommended to use a secret store for the secrets as described here

Apply the configuration

In Kubernetes

To apply the NATS pub/sub to Kubernetes, use the kubectl CLI:

kubectl apply -f nats.yaml

Running locally

The Dapr CLI will automatically create a directory named components in your current working directory with a Redis component. To use NATS, replace the contents of messagebus.yaml file with the contents of nats.yaml above (Don't change the filename).

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