Can you use Pod Affinity/Anti-Affinity with DeploymentConfig?

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I'm looking for instructions/examples of this...

...assuming my administrator has configured OpenShift itself to support pod affinity/anti-affinity, how do I configure my DeploymentConfig (the method I'm deploying my application) to leverage this? I see examples of using Pod configs, but not DCs. Or maybe I'm missing something?

I'd like to deploy my application (DC) so that the pods that are created are spread around different nodes (I believe using anti-affinity preferred is the way to do this?)

Thanks!

-- Andy

AA
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Responses

FM Newbie 9 points
26 April 2018 2:48 PM

Same question here.

KS Red Hat Active Contributor 155 points
23 October 2018 1:53 AM

Both Affinity and Anti-Affinity can configure on DC, Here is a example:

apiVersion: v1
kind: DeploymentConfig
metadata:
  name: mysql
spec:
  replicas: 4
  selector:
    app: mysql
  template:
    metadata:
      name: mysql
      labels:
        app: mysql
    spec:
      containers:
      - name: mysql
        image: registry.cmcc.com/rhscl/mysql-57-rhel7:latest
        env:
          - name: MYSQL_ROOT_PASSWORD
            value: redhat
          - name: MYSQL_USER
            value: test_user
          - name: MYSQL_PASSWORD
            value: test_pass
          - name: MYSQL_DATABASE
            value: test_db
        ports:
          - containerPort: 3306
            name: mysql
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
              - matchExpressions:
                - key: "region"
                  operator: In
                  values:
                    - r1
strategy:
  type: Rolling

With the above config, all 4 pods are scheduled to the nodes with label region=r1.

apiVersion: v1
kind: DeploymentConfig
metadata:
  name: mysql
spec:
  replicas: 4
  selector:
    app: mysql
  template:
    metadata:
      name: mysql
      labels:
        app: mysql
      annotations:
        scheduler.alpha.kubernetes.io/affinity: |
          {
            "podAntiAffinity": {
              "requiredDuringSchedulingIgnoredDuringExecution": [{
                "labelSelector": {
                  "matchExpressions": [{
                    "key": "zone",
                    "operator": "In",
                    "values":["z1","z2"]
                  }]
                },
                "topologyKey": "kubernetes.io/hostname"
              }]
            }
          }
    spec:
      containers:
      - name: mysql
        image: registry.cmcc.com/rhscl/mysql-57-rhel7:latest
        env:
          - name: MYSQL_ROOT_PASSWORD
            value: redhat
          - name: MYSQL_USER
            value: test_user
          - name: MYSQL_PASSWORD
            value: test_pass
          - name: MYSQL_DATABASE
            value: test_db
        ports:
          - containerPort: 3306
            name: mysql
  strategy:
    type: Rolling

With above config, the 4 pod are deploy toz1 and z2.

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