Question

我有一个反关联性规则，要求kubernetes将来自同一部署的Pod调度到different nodes上，我们已经使用了很长时间了。

affinity:
  podAntiAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
    - topologyKey: kubernetes.io/hostname
      labelSelector:
        matchExpressions:
        - key: application
          operator: In
          values:
          - {{ $appName }}
        - key: proc  
          operator: In
          values:
          - {{ $procName }}

我正在尝试将Pod关联性规则更新为强烈的偏好设置，而不是硬性要求，因此，如果部署需要的副本数超过可用节点数，我们就无需扩展集群。

affinity:
  podAntiAffinity:
    preferredDuringSchedulingIgnoredDuringExecution:
    - topologyKey: kubernetes.io/hostname
      weight: 100
      labelSelector:
        matchExpressions:
        - key: application
          operator: In
          values:
          - {{ $appName }}
        - key: proc 
          operator: In
          values:
          - {{ $procName }}

但是，当我尝试应用新规则时，topologyKey出现意外错误：

Error: Deployment.apps "core--web" is invalid:
[spec.template.spec.affinity.podAntiAffinity.preferredDuringSchedulingIgnoredDuringExecution[0].podAffinityTerm.topologyKey: Required value: can not be empty,
spec.template.spec.affinity.podAntiAffinity.preferredDuringSchedulingIgnoredDuringExecution[0].podAffinityTerm.topologyKey: Invalid value: "": name part must be non-empty,
spec.template.spec.affinity.podAntiAffinity.preferredDuringSchedulingIgnoredDuringExecution[0].podAffinityTerm.topologyKey: Invalid value: "": name part must consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character (e.g. 'MyName',  or 'my.name',  or '123-abc', regex used for validation is '([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9]')]

即使我的所有节点都有与正则表达式匹配的指定键的标签，调度程序似乎仍在获取拓扑键的空字符串值：

$ kubectl describe nodes | grep kubernetes.io/hostname
kubernetes.io/hostname=ip-10-x-x-x.ec2.internal
kubernetes.io/hostname=ip-10-x-x-x.ec2.internal
kubernetes.io/hostname=ip-10-x-x-x.ec2.internal
kubernetes.io/hostname=ip-10-x-x-x.ec2.internal

我没想到通过从必需到首选的简单更改就可以看到这样的问题。我搞砸了什么导致topologyKey错误？

Answer 1

必需和首选语法之间存在细微差别，请注意错误消息路径中对podAffinityTerm的引用：

spec.template.spec.affinity.podAntiAffinity.preferredDuringSchedulingIgnoredDuringExecution[0].podAffinityTerm.topologyKey

首选计划的正确语法是：

affinity:
  podAntiAffinity:
    preferredDuringSchedulingIgnoredDuringExecution:
    - weight: 100
      podAffinityTerm:
        topologyKey: kubernetes.io/hostname
        labelSelector:
          matchExpressions:
          - key: application
            operator: In
            values:
            - {{ $appName }}
          - key: proc
            operator: In
            values:
            - {{ $procName }}

请注意，weight是顶级密钥，其同级podAffinityTerm包含topologyKey和labelSelector。

具有拓扑键的反亲和性规则部署失败：kubernetes.io/hostname-必需值：不能为空

1 个答案: