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

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

Step 3: Create quota

oc create quota project-quota --hard=pods=10

Step 4: Describe quota

oc describe quota project-quota

Step 5: Create limit ranges

vi limits.yaml

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}

oc create -f limits.yaml

Step 6: Describe limit ranges

oc describe limits project-limits

Step 7: Describe node

oc describe node localhost | grep -A 4 Allocated

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

Step 9: Describe quota

oc describe quota project-quota

Step 10: Describe limit

oc describe limits project-limits

Step 11: Scale up nodejs application

oc scale dc nodejs --replicas=9

Step 12: Describe quota

oc describe quota project-quota

Step 13: Describe limit

oc describe limits project-limits

Step 14: Scale up nodejs application

oc scale dc nodejs --replicas=15

Step 15: List pods

oc get pods

Step 16: List events

oc get events