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Workload-Node Affinity

Using the CCE Console

  1. When Creating a Deployment or Creating a StatefulSet, in the Scheduling Policies area on the Configure Advanced Settings page, choose Workload-Node Affinity and Anti-affinity > Affinity with Nodes > Add.

    Figure 1 Affinity with nodes

  2. Select the node on which you want to deploy the workload, and click OK.

    If you select multiple nodes, the system automatically chooses one of them during workload deployment.

Using kubectl

This section uses an Nginx workload as an example to describe how to create a workload using kubectl.

Prerequisites

The ECS where the kubectl client runs has been connected to your cluster. For details, see Connecting to a Cluster Using kubectl.

Procedure

When using kubectl to create a Deployment or using kubectl to create a StatefulSet, configure workload-node affinity. The following is an example YAML file for workload-node affinity.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app: nginx
  strategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - image: nginx 
        imagePullPolicy: Always
        name: nginx
      imagePullSecrets:
      - name: default-secret
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: nodeName          #node's label key
                operator: In
                values:
                - test-node-1          #node's label value

Setting the Object Type After Creating a Workload

  1. Log in to the CCE console and choose Workloads > Deployments or Workloads > StatefulSets in the navigation pane.
  2. Click the name of the workload for which you will add a scheduling policy. On the workload details page, choose Scheduling Policies > Add Simple Scheduling Policy > Add Affinity Object.
  3. Set Object Type to Node and select the node where the workload is to be deployed. The workload will be deployed on the selected node.

    Figure 2 Adding an affinity object - Node

    This method can be used to add, edit, or delete scheduling policies.