I'm having trouble using nodeAntiAffinity... in my use case I need to prevent the instances of a StatefulSet running on the same node, and that's it. I don't have labels for my nodes, which the doc looks to list as a requirement. Is it possible to purely rely on unique values of the built in label "kubernetes.io/hostname"?
What I am trying to do in my StatefulSet:
spec:
podManagementPolicy: OrderedReady
affinity:
nodeAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
topologyKey: "kubernetes.io/hostname"What the examples in the doc say I have to do:
spec:
podManagementPolicy: OrderedReady
affinity:
nodeAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: <some key>
operator: In
values:
- <some value>
topologyKey: "kubernetes.io/hostname"To prevent the instances of a StatefulSet running on the same node, you need a podAntiAffinity, excerpt from zookeeper tutorial of Kubernetes document :
affinity:
podAntiAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
- labelSelector:
matchExpressions:
- key: "app"
operator: In
values:
- zk
topologyKey: "kubernetes.io/hostname"