在Kubernetes中共同定位Pod和持久卷 [英] Co locate pods and persistent volumes in kubernetes

问题描述

我有一个分布在A和B两个区域的kubernetes集群.我正在使用nfs卷进行持久存储.我在两个区域中都有nfs卷.我正在创建一个有状态的2个副本集，这些副本将散布在这些区域中(我使用pod anti-affinity实现了此目的).现在，我希望区域A中的豆荚使用区域A中的卷，而区域B中的豆荚使用区域B中的卷.

I have a kubernetes cluster spread across two zones, A and B. I am using nfs volumes for persistent storage. I have nfs volumes in both the zones. I am creating a stateful set of 2 replicas which will be spread across these zones (I used pod anti-affinity to achieve this). Now I want the pods in zone A to use the volumes in zone A and ones in zone B to use the volumes in zone B.

我可以在持久卷中添加标签，并将持久卷声明与这些标签进行匹配.但是，如何确保Pod的PVC不绑定到另一个区域中的PV?

I can add labels to the persistent volumes and match the persistent volume claims with these labels. But how do I make sure that the pvc for a pod does not get bound to a pv in another zone?

推荐答案

您可以尝试使用特殊的内置标签failure-domain.beta.kubernetes.io/zone将persistent volume claims (PVCs)绑定到persistent volumes (PVs)，并在两个区域之间的整个群集中拆分Kubernetes集群.如果手动创建卷，则可以使用failure-domain.beta.kubernetes.io/zone:zoneA值对其进行标记，以确保将pod仅调度到与持久卷的区域相同的区域中的节点.

You can try to bind persistent volume claims (PVCs) to persistent volumes (PVs) and split Kubernetes pods across your cluster between two zones using the special built-in label failure-domain.beta.kubernetes.io/zone. If you create volumes manually, it is possible to label them with failure-domain.beta.kubernetes.io/zone:zoneA value, ensuring that pod is only scheduled to nodes in the same zone as the zone of the persistent volume.

例如，为节点和PV设置label:

For example, to set label for a Node and PV:

kubectl label node <node-name> failure-domain.beta.kubernetes.io/zone=zoneA

kubectl label pv <pv-name> failure-domain.beta.kubernetes.io/zone=zoneA

从官方Kubernetes中找到一些有用的信息文档.

Find some useful information from official Kubernetes documentation.

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