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JetStream

Detailed documentation on the NATS JetStream component

Component format

To setup JetStream pubsub create a component of type pubsub.jetstream. See this guide on how to create and apply a pubsub configuration.

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: jetstream-pubsub
spec:
  type: pubsub.jetstream
  version: v1
  metadata:
  - name: natsURL
    value: "nats://localhost:4222"
  - name: jwt
    value: "eyJhbGciOiJ...6yJV_adQssw5c" # Optional. Used for decentralized JWT authentication
  - name: seedKey
    value: "SUACS34K232O...5Z3POU7BNIL4Y" # Optional. Used for decentralized JWT authentication
  - name: name
    value: "connection name"
  - name: durableName
    value: "consumer durable name"
  - name: queueGroupName
    value: "queue group name"
  - name: startSequence
    value: 1
  - name: startTime # in Unix format
    value: 1630349391
  - name: deliverAll
    value: false
  - name: flowControl
    value: false

Spec metadata fields

Field Required Details Example
natsURL Y NATS server address URL “nats://localhost:4222”
jwt N NATS decentralized authentication JWT “eyJhbGciOiJ...6yJV_adQssw5c”
seedKey N NATS decentralized authentication seed key “SUACS34K232O...5Z3POU7BNIL4Y”
name N NATS connection name "my-conn-name"
durableName N Durable name "my-durable"
queueGroupName N Queue group name "my-queue"
startSequence N Start Sequence 1
startTime N Start Time in Unix format 1630349391
deliverAll N Set deliver all as Replay Policy true
flowControl N Flow Control true

Create a NATS server


You can run a NATS Server with JetStream enabled locally using Docker:

docker run -d -p 4222:4222 nats:latest -js

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


Install NATS JetStream on Kubernetes by using the helm:

helm repo add nats https://nats-io.github.io/k8s/helm/charts/
helm install --set nats.jetstream.enabled=true my-nats nats/nats

This installs a single NATS server into the default namespace. To interact with NATS, find the service with:

kubectl get svc my-nats

For more information on helm chart settings, see the Helm chart documentation.

Create JetStream

It is essential to create a NATS JetStream for a specific subject. For example, for a NATS server running locally use:

nats -s localhost:4222 stream add myStream --subjects mySubject

Last modified July 27, 2022: Remove namespace element from component examples (#2647) (ff9de5c8)