How do i add Node Affinity in values.yaml file

[YashasAnand]

Can someone pls tell me where do i add node affinity as i dont see these sections in values.yaml file.

[apena-pmy]

Hi @YashasAnand !
If you want to add affinity to nats chart template, this is how we add podAntiAffinity:

podTemplate:
  merge:
    spec:
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
            - podAffinityTerm:
                labelSelector:
                  matchExpressions:
                    - key: app
                      operator: In
                      values:
                      - nats
                topologyKey: kubernetes.io/hostname
              weight: 1

If you want for other template, please share wich one so anyone can help you.

[pbennett]

If using the nats helm chart, you can use the recommended settings:

config:
  podTemplate:
    topologySpreadConstraints:
      kubernetes.io/hostname:
        maxSkew: 1
        whenUnsatisfiable: DoNotSchedule

It's listed in jetstream 3 node cluster example.

[YashasAnand]

thank you @pbennett @apena-pmy for your respnses I was able to do it with your as below

merge:
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: app
operator: In
values:
- node1