Single Server Cluster Setup

You can install a single server Dgraph cluster in Kubernetes.

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Before you begin

• Install the Kubernetes command line tool.
• Ensure that you have a production-ready Kubernetes cluster running in a cloud provider of your choice.
• (Optional) To run Dgraph Alpha with TLS, see TLS Configuration.

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Installing a single server Dgraph cluster

1. Verify that you are able to access the nodes in the Kubernetes cluster:

   kubectl get nodes
   

   An output similar to this appears:

   NAME                                          STATUS   ROLES    AGE   VERSION
   <aws-ip-hostname>.<region>.compute.internal   Ready    <none>   1m   v1.15.11-eks-af3caf
   <aws-ip-hostname>.<region>.compute.internal   Ready    <none>   1m   v1.15.11-eks-af3caf
   

   After your Kubernetes cluster is up, you can use dgraph-single.yaml to start a Zero, Alpha, and Ratel UI services.

2. Start a StatefulSet that creates a single Pod with Zero, Alpha, and Ratel UI:

   kubectl create --filename https://raw.githubusercontent.com/hypermodeinc/dgraph/master/contrib/config/kubernetes/dgraph-single/dgraph-single.yaml
   

   An output similar to this appears:

   service/dgraph-public created
   statefulset.apps/dgraph created
   

3. Confirm that the Pod was created successfully.

   kubectl get pods
   

   An output similar to this appears:

   NAME       READY     STATUS    RESTARTS   AGE
   dgraph-0   3/3       Running   0          1m
   

4. List the containers running in the Pod dgraph-0:

   kubectl get pods dgraph-0 -o jsonpath='{range .spec.containers[*]}{.name}{"\n"}{end}'
   

   An output similar to this appears:

   ratel
   zero
   alpha
   

   You can check the logs for the containers in the pod using kubectl logs --follow dgraph-0 <CONTAINER_NAME>.

5. Port forward from your local machine to the Pod:

   kubectl port-forward pod/dgraph-0 8080:8080
   kubectl port-forward pod/dgraph-0 8000:8000
   

6. Go to http://localhost:8000 to access Dgraph using the Ratel UI.

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Deleting Dgraph single server resources

Delete all the resources using:

kubectl delete --filename https://raw.githubusercontent.com/hypermodeinc/dgraph/master/contrib/config/kubernetes/dgraph-single/dgraph-single.yaml
kubectl delete persistentvolumeclaims --selector app=dgraph