[英]Pods affinity to different nodes in StatefulSet
I am creating StatefulSets and I want pods within one StatefulSet to be distributed across different nodes of the k8s cluster.我正在创建 StatefulSet,我希望一个 StatefulSet 中的 pod 分布在 k8s 集群的不同节点上。 In my case - one StatefulSet is one database replicaset.就我而言 - 一个 StatefulSet 是一个数据库副本集。
sts.Spec.Template.Labels["mydb.io/replicaset-uuid"] = replicasetUUID.String()
sts.Spec.Template.Spec.Affinity.PodAntiAffinity = &corev1.PodAntiAffinity{
RequiredDuringSchedulingIgnoredDuringExecution: []corev1.PodAffinityTerm{
{
LabelSelector: &metav1.LabelSelector{
MatchExpressions: []metav1.LabelSelectorRequirement{
{
Key: "mydb.io/replicaset-uuid",
Operator: metav1.LabelSelectorOpIn,
Values: []string{replicasetUUID.String()},
},
},
},
TopologyKey: "kubernetes.io/hostname",
},
},
}
However, with these settings, I get the opposite.但是,通过这些设置,我得到了相反的结果。 storage-0-0
and storage-0-1
are on the same replicaset and on the same node... storage-0-0
和storage-0-1
在同一个副本集和同一个节点上......
Moreover, they have exactly the same label mydb.io/replicaset-uuid
此外,它们具有完全相同的 label mydb.io/replicaset-uuid
$ kubectl -n mydb get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
storage-0-0 1/1 Running 0 40m x.x.x.x kubernetes-cluster-x-main-0 <none> <none>
storage-0-1 1/1 Running 0 39m x.x.x.x kubernetes-cluster-x-main-0 <none> <none>
storage-1-0 1/1 Running 0 40m x.x.x.x kubernetes-cluster-x-slave-0 <none> <none>
storage-1-1 1/1 Running 0 40m x.x.x.x kubernetes-cluster-x-slave-0 <none> <none>
mydb-operator-58c9bfbb9b-7djml 1/1 Running 0 46m x.x.x.x kubernetes-cluster-x-slave-0 <none> <none>
I suggest using an podAntiAffinity rule in the statefulset definition to deploy your application so that no two instances are located on the same host.我建议在 statefulset 定义中使用 podAntiAffinity 规则来部署您的应用程序,以便没有两个实例位于同一主机上。
Reference: An example of a pod that uses pod affinity参考: 使用 pod 亲和性的 pod 示例
It works correctly, as @jesmart wrote in the comment:正如@jesmart 在评论中所写,它可以正常工作:
The description of the problem works correctly I just indicated the wrong image with the application问题描述正确我只是用应用程序指出了错误的图像
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