MongoDB

Detailed information on the MongoDB state store component

Setup a MongoDB state store


You can run MongoDB locally using Docker:

docker run --name some-mongo -d mongo

You can then interact with the server using localhost:27017.


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

helm install mongo stable/mongodb

This will install MongoDB into the default namespace. To interact with MongoDB, find the service with: kubectl get svc mongo-mongodb.

For example, if installing using the example above, the MongoDB host address would be:

mongo-mongodb.default.svc.cluster.local:27017

Follow the on-screen instructions to get the root password for MongoDB. The username will be admin by default.

Create a Dapr component

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

Create the following YAML file named mongodb.yaml:

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
  namespace: <NAMESPACE>
spec:
  type: state.mongodb
  metadata:
  - name: host
    value: <REPLACE-WITH-HOST> # Required. Example: "mongo-mongodb.default.svc.cluster.local:27017"
  - name: username
    value: <REPLACE-WITH-USERNAME> # Optional. Example: "admin"
  - name: password
    value: <REPLACE-WITH-PASSWORD> # Optional.
  - name: databaseName
    value: <REPLACE-WITH-DATABASE-NAME> # Optional. default: "daprStore"
  - name: collectionName
    value: <REPLACE-WITH-COLLECTION-NAME> # Optional. default: "daprCollection"
  - name: writeconcern
    value: <REPLACE-WITH-WRITE-CONCERN> # Optional.
  - name: readconcern
    value: <REPLACE-WITH-READ-CONCERN> # Optional.
  - name: operationTimeout
    value: <REPLACE-WITH-OPERATION-TIMEOUT> # Optional. default: "5s"

Example

The following example uses the Kubernetes secret store to retrieve the username and password:

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
  namespace: <NAMESPACE>
spec:
  type: state.mondodb
  metadata:
  - name: host
    value: <REPLACE-WITH-HOST>
  - name: username
    secretKeyRef:
      name: <KUBERNETES-SECRET-NAME>
      key: <KUBERNETES-SECRET-KEY>
  - name: password
    secretKeyRef:
      name: <KUBERNETES-SECRET-NAME>
      key: <KUBERNETES-SECRET-KEY>
  ...

Apply the configuration

In Kubernetes

To apply the MondoDB state store to Kubernetes, use the kubectl CLI:

kubectl apply -f mongodb.yaml

Running locally

To run locally, create a components dir containing the YAML file and provide the path to the dapr run command with the flag --components-path.