94 lines
2.6 KiB
Markdown
94 lines
2.6 KiB
Markdown
---
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vssueId: 144
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layout: LearningLayout
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description: Kubernetes教程_当多个用户或团队共享一个节点数量有限的集群时_如何在多个用户或团队之间分配集群的资源就会变得非常重要_Resource_quota的用途便在于此_本文通过实例讲解了如何为名称空间配置CPU和内存的资源配额
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meta:
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- name: keywords
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content: K8S 教程,Resource Quota,ResourceQuota
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---
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# Pod数量限额
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<AdSenseTitle >
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> 参考文档：[Configure a Pod Quota for a Namespace](https://kubernetes.io/docs/tasks/administer-cluster/manage-resources/quota-pod-namespace/)
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本文通过实例演示了如何通过ResourceQuota为名称空间配置最多可以运行多少个Pod。演示的步骤如下：
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[[TOC]]
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</AdSenseTitle>
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## 创建名称空间
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为本次演示创建名称空间：
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``` sh
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kubectl create namespace quota-pod-example
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```
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## 创建ResourceQuota
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为本次演示创建 ResourceQuota 对象，yaml文件如下所示：
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<<< @/.vuepress/public/statics/learning/policy/rq-pod-quota.yaml {7}
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执行命令创建该 ResourceQuota
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``` sh
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kubectl apply -f https://kuboard.cn/statics/learning/policy/rq-pod-quota.yaml --namespace=quota-pod-example
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```
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执行如下命令查看已创建的 ResourceQuota
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``` sh
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kubectl get resourcequota pod-demo --namespace=quota-pod-example --output=yaml
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```
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输出结果中显示了该名称空间的配额限定了只能创建两个 Pod，当前没有任何 Pod 被创建：
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``` yaml {3,6,8}
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spec:
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hard:
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pods: "2"
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status:
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hard:
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pods: "2"
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used:
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pods: "0"
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```
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## 创建Pod
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创建如下 Deployment
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<<< @/.vuepress/public/statics/learning/policy/rq-pod-deployment.yaml
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该 Deployment 的副本数为 3 `replicas: 3`，执行命令以创建该 Deployment：
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``` sh
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kubectl apply -f https://kuboard.cn/statics/learning/policy/rq-pod-deployment.yaml --namespace=quota-pod-example
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```
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执行命令以查看 Deployment 的详细信息
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``` sh
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kubectl get deployment pod-quota-demo --namespace=quota-pod-example --output=yaml
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```
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尽管 Deployment 期望的副本数是 3，但是由于名称空间通过 ResourceQuota 限定了最大的 Pod 数量，因此，最终只有两个 Pod 被创建成功。输出结果如下所示：
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``` yaml {3,6,9}
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spec:
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...
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replicas: 3
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...
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status:
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availableReplicas: 2
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...
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lastUpdateTime: 2017-07-07T20:57:05Z
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message: 'unable to create pods: pods "pod-quota-demo-1650323038-" is forbidden:
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exceeded quota: pod-demo, requested: pods=1, used: pods=2, limited: pods=2'
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```
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## 清理
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删除名称空间可清理本次演示创建的对象：
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``` sh
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kubectl delete namespace quota-pod-example
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```
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