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