Deploy NebulaGraph clusters with Kubectl

Legacy version compatibility

The 1.x version NebulaGraph Operator is not compatible with NebulaGraph of version below v3.x.

Prerequisites

• Install NebulaGraph Operator

• You have prepared the license file for NebulaGraph Enterprise Edition clusters.

  Enterpriseonly

  The license file is required only when creating a NebulaGraph Enterprise Edition cluster.

Create clusters

The following example shows how to create a NebulaGraph cluster by creating a cluster named nebula.

1. Create a file named apps_v1alpha1_nebulacluster.yaml.

   • The file contents for a NebulaGraph Community cluster are as follows:

     apiVersion: apps.nebula-graph.io/v1alpha1
     kind: NebulaCluster
     metadata:
       name: nebula
     spec:
       graphd:
         resources:
           requests:
             cpu: "500m"
             memory: "500Mi"
           limits:
             cpu: "1"
             memory: "1Gi"
         replicas: 1
         image: vesoft/nebula-graphd
         version: v3.4.1
         logVolumeClaim:
           resources:
             requests:
               storage: 2Gi
           storageClassName: fast-disks
       metad:
         resources:
           requests:
             cpu: "500m"
             memory: "500Mi"
           limits:
             cpu: "1"
             memory: "1Gi"
         replicas: 1
         image: vesoft/nebula-metad
         version: v3.4.1
         logVolumeClaim:
           resources:
             requests:
               storage: 2Gi
           storageClassName: fast-disks
         dataVolumeClaim:
           resources:
             requests:
               storage: 2Gi
           storageClassName: fast-disks
       storaged:
         resources:
           requests:
             cpu: "500m"
             memory: "500Mi"
           limits:
             cpu: "1"
             memory: "1Gi"
         replicas: 1
         image: vesoft/nebula-storaged
         version: v3.4.1
         logVolumeClaim:
           resources:
             requests:
               storage: 2Gi
           storageClassName: fast-disks
         dataVolumeClaims:  // You can mount multiple disks starting from NebulaGraph Operator 1.3.0.
         - resources:
             requests:
               storage: 2Gi
           storageClassName: fast-disks
         - resources:
             requests:
               storage: 2Gi
           storageClassName: fast-disks
         enableAutoBalance: true
       reference:
         name: statefulsets.apps
         version: v1
       schedulerName: default-scheduler
       nodeSelector:
         nebula: cloud
       imagePullPolicy: Always
       unsatisfiableAction: ScheduleAnyway    
     

   • The file contents for a NebulaGraph Enterprise cluster are as follows:

     # Contact our sales team to get a complete NebulaGraph Enterprise Edition cluster YAML example.
     
     apiVersion: apps.nebula-graph.io/v1alpha1
     kind: NebulaCluster
     metadata:
       annotations:
         nebula-graph.io/owner: test
       name: nebula
     spec:
       graphd:
         readinessProbe:
           failureThreshold: 3
           httpGet:
             path: /status
             port: 19669
             scheme: HTTP
           initialDelaySeconds: 40
           periodSeconds: 10
           successThreshold: 1
           timeoutSeconds: 10
         image: reg.vesoft-inc.com/vesoft-ent/nebula-graphd
         logVolumeClaim:
           resources:
             requests:
               storage: 2Gi
           storageClassName: fast-disks
         replicas: 1
         resources:
           limits:
             cpu: "1"
             memory: 1Gi
           requests:
             cpu: 500m
             memory: 500Mi
         version: v3.4.1
       imagePullPolicy: Always
       imagePullSecrets:
       - name: vesoft
       metad:
         license:
           secretName: nebula-license
           licenseKey: nebula.license
       ...       
     

   The parameters in the file are described as follows:

   Parameter	Default value	Description
   metadata.name	-	The name of the created NebulaGraph cluster.
   spec.graphd.replicas	1	The numeric value of replicas of the Graphd service.
   spec.graphd.images	vesoft/nebula-graphd	The container image of the Graphd service.
   spec.graphd.version	v3.4.1	The version of the Graphd service.
   spec.graphd.service	-	The Service configurations for the Graphd service.
   spec.graphd.logVolumeClaim.storageClassName	-	The log disk storage configurations for the Graphd service.
   spec.metad.replicas	1	The numeric value of replicas of the Metad service.
   spec.metad.images	vesoft/nebula-metad	The container image of the Metad service.
   spec.metad.version	v3.4.1	The version of the Metad service.
   spec.metad.dataVolumeClaim.storageClassName	-	The data disk storage configurations for the Metad service.
   spec.metad.logVolumeClaim.storageClassName	-	The log disk storage configurations for the Metad service.
   spec.storaged.replicas	3	The numeric value of replicas of the Storaged service.
   spec.storaged.images	vesoft/nebula-storaged	The container image of the Storaged service.
   spec.storaged.version	v3.4.1	The version of the Storaged service.
   spec.storaged.dataVolumeClaims.resources.requests.storage	-	Data disk storage size for the Storaged service. You can specify multiple data disks to store data. When multiple disks are specified, the storage path is /usr/local/nebula/data1, /usr/local/nebula/data2, etc.
   spec.storaged.dataVolumeClaims.resources.storageClassName	-	The data disk storage configurations for Storaged. If not specified, the global storage parameter is applied.
   spec.storaged.logVolumeClaim.storageClassName	-	The log disk storage configurations for the Storaged service.
   spec.storaged.enableAutoBalance	true	Whether to balance data automatically.
   spec.reference.name	-	The name of the dependent controller.
   spec.schedulerName	-	The scheduler name.
   spec.imagePullPolicy	The image policy to pull the NebulaGraph image. For details, see Image pull policy.	The image pull policy in Kubernetes.
   spec.metad.license	-	The configuration of the license for creating a NebulaGraph Enterprise Edition cluster.

   Enterpriseonly

   Make sure that you have access to NebulaGraph Enterprise Edition images before pulling the image. For details, contact our sales team (inqury@vesoft.com)

2. Configure the license for the Enterprise Edition cluster.

   Enterpriseonly

   • This step is required only for creating a NebulaGraph Grpah Enterprise Edition cluster.

   • Ignore this step if you are creating a NebulaGraph Community Edition cluster.

   kubectl create secret generic nebula-license --from-file=nebula.license
   

   To check the details of the license, run the following command:

   kubectl get secrets nebula-license -o yaml
   

3. Create a NebulaGraph cluster.

   kubectl create -f apps_v1alpha1_nebulacluster.yaml
   

   Output:

   nebulacluster.apps.nebula-graph.io/nebula created
   

4. Check the status of the NebulaGraph cluster.

   kubectl get nebulaclusters.apps.nebula-graph.io nebula
   

   Output:

   NAME     GRAPHD-DESIRED   GRAPHD-READY   METAD-DESIRED   METAD-READY   STORAGED-DESIRED   STORAGED-READY   AGE
   nebula   1                1              1               1             3                  3                86s
   

Scaling clusters

• The cluster scaling feature is for NebulaGraph Enterprise Edition only.

• Scaling a NebulaGraph cluster for Enterprise Edition is supported only with NebulaGraph Operator version 1.1.0 or later.

You can modify the value of replicas in apps_v1alpha1_nebulacluster.yaml to scale a NebulaGraph cluster.

Scale out clusters

The following shows how to scale out a NebulaGraph cluster by changing the number of Storage services to 5:

1. Change the value of the storaged.replicas from 3 to 5 in apps_v1alpha1_nebulacluster.yaml.

     storaged:
       resources:
         requests:
           cpu: "500m"
           memory: "500Mi"
         limits:
           cpu: "1"
           memory: "1Gi"
       replicas: 5
       image: vesoft/nebula-storaged
       version: v3.4.1
       dataVolumeClaims:
       - resources:
           requests:
             storage: 2Gi
         storageClassName: fast-disks
       - resources:
           requests:
             storage: 2Gi
         storageClassName: fast-disks
       logVolumeClaim:
         resources:
           requests:
             storage: 2Gi
         storageClassName: fast-disks
     reference:
       name: statefulsets.apps
       version: v1
     schedulerName: default-scheduler
   

2. Run the following command to update the NebulaGraph cluster CR.

   kubectl apply -f apps_v1alpha1_nebulacluster.yaml
   

3. Check the number of Storage services.

   kubectl  get pods -l app.kubernetes.io/cluster=nebula
   

   Output:

   NAME                READY   STATUS    RESTARTS   AGE
   nebula-graphd-0     1/1     Running   0          2m
   nebula-metad-0      1/1     Running   0          2m
   nebula-storaged-0   1/1     Running   0          2m
   nebula-storaged-1   1/1     Running   0          2m
   nebula-storaged-2   1/1     Running   0          2m
   nebula-storaged-3   1/1     Running   0          5m
   nebula-storaged-4   1/1     Running   0          5m
   

   As you can see above, the number of Storage services is scaled up to 5.

Scale in clusters

The principle of scaling in a cluster is the same as scaling out a cluster. You scale in a cluster if the numeric value of the replicas in apps_v1alpha1_nebulacluster.yaml is changed smaller than the current number. For more information, see the Scale out clusters section above.

Caution

NebulaGraph Operator currently only supports scaling Graph and Storage services and does not support scale Meta services.

Delete clusters

Run the following command to delete a NebulaGraph cluster with Kubectl:

kubectl delete -f apps_v1alpha1_nebulacluster.yaml

What's next

Connect to NebulaGraph databases

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Last update: February 19, 2024