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How to limit resources using Quotas & Limit Ranges in OpenShift?

sagarjadhv23 profile image Sagar Jadhav Originally published at developersthought.in Updated on ・1 min read

Objective

  • Create project my-project
  • Create Quota & Limit Ranges for project my-project
  • Deploy Node JS Application using S2I
  • Verify allocated Quota & Limits

Step 1: Set up OpenShift environment

Go to Katacoda.com & click on start scenario

Step 2: Create project my-project

oc new-project my-project
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Step 3: Create quota

oc create quota project-quota --hard=pods=10
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Step 4: Describe quota

oc describe quota project-quota
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Step 5: Create limit ranges

vi limits.yaml
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Add following limit range

apiVersion: v1
kind: LimitRange
metadata:
    name: project-limits
spec:
    limits:
        -
            type: Container
            max: {cpu: '2'}
            min: {cpu: 100m}
            default: {cpu: 300m}
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oc create -f limits.yaml
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Step 6: Describe limit ranges

oc describe limits project-limits
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Step 7: Describe node

oc describe node localhost | grep -A 4 Allocated
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Step 8: Deploy nodejs application using s2i

oc new-app -i nodejs:8 https://github.com/sagar-jadhav/node-hello --name nodejs -l app=demo
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Step 9: Describe quota

oc describe quota project-quota
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Step 10: Describe limit

oc describe limits project-limits
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Step 11: Scale up nodejs application

oc scale dc nodejs --replicas=9
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Step 12: Describe quota

oc describe quota project-quota
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Step 13: Describe limit

oc describe limits project-limits
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Step 14: Scale up nodejs application

oc scale dc nodejs --replicas=15
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Step 15: List pods

oc get pods
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Step 16: List events

oc get events
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