Scheduling

Volcano supports Kubernetes native scheduling. You can use nodeAffinity for scheduling. The following example uses forcible node affinity for scheduling. For more information about the nodeAffinity field, see official Kubernetes documentation.

• Add the following fields in bold to the YAML file of VolcanoJob:

  apiVersion: batch.volcano.sh/v1alpha1  
  kind: Job                         
  metadata:
    name: mindx-test
    labels:
  ...
  spec:
  ...
    maxRetry: 3
    queue: default
    tasks:
    - name: "default-test"
      replicas: 1 
      template:
        metadata:
          labels:
  ...
        spec:
          affinity:      # Add the following fields in bold.
            nodeAffinity:                             # Node affinity configuration
              requiredDuringSchedulingIgnoredDuringExecution: 
                nodeSelectorTerms:                    # Node selection list
                  - matchExpressions:
                      - key: aaa               # Match the node whose label key is aaa and value is yyy.
                        operator: In
                        values:
                          - yyy
               podAntiAffinity:
                 requiredDuringSchedulingIgnoredDuringExecution:
  ...
            nodeSelector:
              host-arch: huawei-arm
  ...

• Add the following fields in bold to the YAML file of AscendJob:

  apiVersion: mindxdl.gitee.com/v1
  kind: AscendJob
  metadata:
    name: test-2
  ...
  spec:
    schedulerName: volcano  
    runPolicy:
      schedulingPolicy:   
        minAvailable: 2
        queue: default
    successPolicy: AllWorkers
    replicaSpecs:
      Master:
        replicas: 1
        restartPolicy: Never
        template:
          metadata:
            labels:
  ...
          spec:
            affinity:   # New field
              nodeAffinity:                           # Node affinity configuration
                requiredDuringSchedulingIgnoredDuringExecution: 
                  nodeSelectorTerms:                  # Node selection list
                    - matchExpressions:
                      - key: aaa               # Match the node whose label key is aaa and value is yyy.
                        operator: In
                        values:
                          - yyy
            nodeSelector:
              host-arch: huawei-arm
  ...

  

  You can run the kubectl get node --show-labels command to query the node label. In the LABELS field, the value before the equal sign (=) is the label key, and the value after the equal sign (=) is the label value, for example, aaa = yyy.