Quotas - Resource Limits - Scale - Autoscale

Deploy hello-nginx app to test with in project limits-scale

❯ oc new-project limits-scale        

❯ oc new-app --name hello --image quay.io/redhattraining/hello-world-nginx

scale deployment to 2 pods

❯ oc scale deployment hello --replicas 2                                  
deployment.apps/hello scaled

❯ oc get pods                           
NAME                     READY   STATUS    RESTARTS   AGE
hello-76bfc67544-9tf98   1/1     Running   0          2m15s
hello-76bfc67544-xzpkl   1/1     Running   0          7s

Create an autoscale policy so that the deployment has a minimum 2 pods and a max of 4 pod and scales when cpu is over 75%

❯ oc autoscale deployment hello --min 2 --max 4 --cpu-percent 75
horizontalpodautoscaler.autoscaling/hello autoscaled

❯ oc get horizontalpodautoscalers.autoscaling 
NAME    REFERENCE          TARGETS         MINPODS   MAXPODS   REPLICAS   AGE
hello   Deployment/hello   <unknown>/75%   2         4         2          82s

Create resource limits for deployment
[] request cpu 100m
[] limit cpu 200m
[] request memory 20Mi
[] limit memory 100Mi

> oc set resource deployment hello --limits=cpu=200m,memory=100Mi --requests=cpu=100m,memory=20Mi

(note: if app isn't running due to cpu request exceeded, lower the request amount)

Create quota: cpu 3, memory 1G, configmaps 2 in the curent project

login as admin

❯ oc create quota project-quota --hard=cpu=3,memory=1Gi,configmaps=2 -n limits-scale 
resourcequota/project-quota created

❯ oc get quota                                                                      
NAME            AGE   REQUEST                                          LIMIT
project-quota   12m   configmaps: 2/2, cpu: 200m/3, memory: 40Mi/1Gi