4.11.-resource-quotas.md

Quotas

When several users or teams share a cluster with a fixed number of nodes, there is a concern that one team could use more than its fair share of resources.

Resource quotas are a tool for administrators to address this concern.

{% hint style="info" %} A Resource Quota, provides constraints that limit aggregate resource consumption per namespace. It can limit the quantity of objects that can be created in a namespace by type, as well as the total amount of compute resources that may be consumed by resources in that project. {% endhint %}

Quotas Tutorial

In this tutorial we'll activate Resource Quota to the kubernetic-tutorial namespace.

Quotas Sample

Deploy kubernetic/resourcequota-sample Chart.

Here is the Resource Quota definition:

{% code-tabs %} {% code-tabs-item title="pv-local01.yaml" %}

apiVersion: v1
kind: ResourceQuota
metadata:
  name: object-counts
spec:
  hard:
    pods: "4"
    configmaps: "10"
    persistentvolumeclaims: "4"
    replicationcontrollers: "20"
    secrets: "10"
    services: "10"
    services.loadbalancers: "2"

{% endcode-tabs-item %} {% endcode-tabs %}

Now go to the Quotas section. You'll see the object-counts Resource Quota that defines the hard limit of objects that can exist inside the current namespace.

Let's test that. Deploy the kubernetic/nginx Chart and increase the Pod replicas to 8. You'll find that Kubernetes only permits 4 Pods to be Running.

Cleanup

You can now delete the nginx and resourcequotas-sample Releases