StatefulSets 中的节点反亲和性，如何仅依赖节点名称与查找特定标签？

Question

我在使用 nodeAntiAffinity 时遇到问题...在我的用例中，我需要阻止同一节点上的 StatefulSet 运行实例，仅此而已。我的节点没有标签，文档希望将其列为要求。是否可以完全依赖内置标签的唯一值 "kubernetes.io/hostname"?

我在 StatefulSet 中尝试做的事情：

spec:
  podManagementPolicy: OrderedReady
  affinity:
    nodeAntiAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        topologyKey: "kubernetes.io/hostname"

文档中的示例说明我必须做什么：

spec:
  podManagementPolicy: OrderedReady
  affinity:
    nodeAntiAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
            - key: <some key>
              operator: In
              values:
                - <some value>
        topologyKey: "kubernetes.io/hostname"

Answer 1

为了防止 StatefulSet 运行的实例在同一个节点上，你需要一个 podAntiAffinity，摘自 Kubernetes document 的 zookeeper 教程：

  affinity:
    podAntiAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        - labelSelector:
            matchExpressions:
              - key: "app"
                operator: In
                values:
                - zk
          topologyKey: "kubernetes.io/hostname"

StatefulSets 中的节点反亲和性，如何仅依赖节点名称与查找特定标签？

Node AntiAffinity in StatefulSets, how to rely solely on node name vs. finding a specific label?

kubernetes

kubernetes-helm