How-To: Scope components to one or more applications

Dapr components are namespaced (separate from the Kubernetes namespace concept), meaning a Dapr runtime instance can only access components that have been deployed to the same namespace.

When Dapr runs, it matches it’s own configured namespace with the namespace of the components that it loads and initializes only the ones matching its namespaces. All other components in a different namespace are not loaded.

Namespaces

Namespaces can be used to limit component access to particular Dapr instances.

• Self-Hosted
• Kubernetes

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: statestore
  namespace: production
spec:
  type: state.redis
  version: v1
  metadata:
  - name: redisHost
    value: redis-master:6379

export NAMESPACE=production
# run Dapr as usual

setx NAMESPACE "production"
# run Dapr as usual

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: statestore
  namespace: production
spec:
  type: state.redis
  version: v1
  metadata:
  - name: redisHost
    value: redis-master:6379

Using namespaces with service invocation

When using service invocation an application in a namespace you have to qualify it with the namespace. For example calling the ping method on myapp which is scoped to the production namespace would be like this.

https://localhost:3500/v1.0/invoke/myapp.production/method/ping

Or using a curl command from an external DNS address, in this case api.demo.dapr.team would be like this.

MacOS/Linux:

curl -i -d '{ "message": "hello" }' \
     -H "Content-type: application/json" \
     -H "dapr-api-token: ${API_TOKEN}" \
     https://api.demo.dapr.team/v1.0/invoke/myapp.production/method/ping

Using namespaces with pub/sub

Read Pub/Sub and namespaces for more information on scoping components.

Application access to components with scopes

Developers and operators might want to limit access for one database to a certain application, or a specific set of applications. To achieve this, Dapr allows you to specify scopes on the component YAML. Application scopes added to a component limit only the applications with specific IDs to be able to use the component.

The following example shows how to give access to two Dapr enabled apps, with the app IDs of app1 and app2 to the Redis component named statestore which itself is in the production namespace

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: statestore
  namespace: production
spec:
  type: state.redis
  version: v1
  metadata:
  - name: redisHost
    value: redis-master:6379
scopes:
- app1
- app2

Example

Related links

• Configure Pub/Sub components with multiple namespaces
• Use secret scoping
• Limit the secrets that can be read from secret stores