176 lines
4.8 KiB
Markdown
176 lines
4.8 KiB
Markdown
---
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title: Configure Quotas for API Objects
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content_template: templates/task
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---
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{{% capture overview %}}
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This page shows how to configure quotas for API objects, including
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PersistentVolumeClaims and Services. A quota restricts the number of
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objects, of a particular type, that can be created in a namespace.
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You specify quotas in a
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[ResourceQuota](/docs/reference/generated/kubernetes-api/{{< param "version" >}}/#resourcequota-v1-core)
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object.
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{{% /capture %}}
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{{% capture prerequisites %}}
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{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
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{{% /capture %}}
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{{% capture steps %}}
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## Create a namespace
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Create a namespace so that the resources you create in this exercise are
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isolated from the rest of your cluster.
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```shell
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kubectl create namespace quota-object-example
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```
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## Create a ResourceQuota
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Here is the configuration file for a ResourceQuota object:
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{{< codenew file="admin/resource/quota-objects.yaml" >}}
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Create the ResourceQuota:
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```shell
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kubectl apply -f https://k8s.io/examples/admin/resource/quota-objects.yaml --namespace=quota-object-example
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```
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View detailed information about the ResourceQuota:
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```shell
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kubectl get resourcequota object-quota-demo --namespace=quota-object-example --output=yaml
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```
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The output shows that in the quota-object-example namespace, there can be at most
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one PersistentVolumeClaim, at most two Services of type LoadBalancer, and no Services
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of type NodePort.
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```yaml
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status:
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hard:
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persistentvolumeclaims: "1"
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services.loadbalancers: "2"
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services.nodeports: "0"
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used:
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persistentvolumeclaims: "0"
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services.loadbalancers: "0"
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services.nodeports: "0"
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```
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## Create a PersistentVolumeClaim
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Here is the configuration file for a PersistentVolumeClaim object:
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{{< codenew file="admin/resource/quota-objects-pvc.yaml" >}}
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Create the PersistentVolumeClaim:
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```shell
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kubectl apply -f https://k8s.io/examples/admin/resource/quota-objects-pvc.yaml --namespace=quota-object-example
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```
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Verify that the PersistentVolumeClaim was created:
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```shell
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kubectl get persistentvolumeclaims --namespace=quota-object-example
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```
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The output shows that the PersistentVolumeClaim exists and has status Pending:
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```shell
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NAME STATUS
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pvc-quota-demo Pending
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```
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## Attempt to create a second PersistentVolumeClaim
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Here is the configuration file for a second PersistentVolumeClaim:
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{{< codenew file="admin/resource/quota-objects-pvc-2.yaml" >}}
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Attempt to create the second PersistentVolumeClaim:
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```shell
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kubectl apply -f https://k8s.io/examples/admin/resource/quota-objects-pvc-2.yaml --namespace=quota-object-example
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```
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The output shows that the second PersistentVolumeClaim was not created,
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because it would have exceeded the quota for the namespace.
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```
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persistentvolumeclaims "pvc-quota-demo-2" is forbidden:
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exceeded quota: object-quota-demo, requested: persistentvolumeclaims=1,
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used: persistentvolumeclaims=1, limited: persistentvolumeclaims=1
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```
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## Notes
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These are the strings used to identify API resources that can be constrained
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by quotas:
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<table>
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<tr><th>String</th><th>API Object</th></tr>
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<tr><td>"pods"</td><td>Pod</td></tr>
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<tr><td>"services"</td><td>Service</td></tr>
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<tr><td>"replicationcontrollers"</td><td>ReplicationController</td></tr>
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<tr><td>"resourcequotas"</td><td>ResourceQuota</td></tr>
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<tr><td>"secrets"</td><td>Secret</td></tr>
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<tr><td>"configmaps"</td><td>ConfigMap</td></tr>
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<tr><td>"persistentvolumeclaims"</td><td>PersistentVolumeClaim</td></tr>
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<tr><td>"services.nodeports"</td><td>Service of type NodePort</td></tr>
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<tr><td>"services.loadbalancers"</td><td>Service of type LoadBalancer</td></tr>
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</table>
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## Clean up
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Delete your namespace:
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```shell
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kubectl delete namespace quota-object-example
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```
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{{% /capture %}}
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{{% capture whatsnext %}}
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### For cluster administrators
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* [Configure Default Memory Requests and Limits for a Namespace](/docs/tasks/administer-cluster/memory-default-namespace/)
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* [Configure Default CPU Requests and Limits for a Namespace](/docs/tasks/administer-cluster/cpu-default-namespace/)
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* [Configure Minimum and Maximum Memory Constraints for a Namespace](/docs/tasks/administer-cluster/memory-constraint-namespace/)
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* [Configure Minimum and Maximum CPU Constraints for a Namespace](/docs/tasks/administer-cluster/cpu-constraint-namespace/)
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* [Configure Memory and CPU Quotas for a Namespace](/docs/tasks/administer-cluster/quota-memory-cpu-namespace/)
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* [Configure a Pod Quota for a Namespace](/docs/tasks/administer-cluster/quota-pod-namespace/)
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### For app developers
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* [Assign Memory Resources to Containers and Pods](/docs/tasks/configure-pod-container/assign-memory-resource/)
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* [Assign CPU Resources to Containers and Pods](/docs/tasks/configure-pod-container/assign-cpu-resource/)
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* [Configure Quality of Service for Pods](/docs/tasks/configure-pod-container/quality-service-pod/)
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{{% /capture %}}
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