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As we have already done, we entrust the php-apache application to HPA and create a replica of infinite-calls. In this case we limit ourselves to creating only 1 replica 2 replicas, because we want to test the reactivity of the cluster at a medium-low intensity load. As mentioned in the introductory part of this chapter, the data are the result of tests carried out on 3 different flavors, shown in descending order.
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$ kubectl autoscale deployment php-apache --cpu-percent=50 --min=1 --max=10 $ kubectl scale deploy infinite-calls --replicas=12 $ kubectl get hpa -watch NAME REFERENCE TARGETS MINPODS MAXPODS REPLICAS AGE php-apache Deployment/php-apache 0%/50% 1 10 1 41m # Starting the workload php-apache Deployment/php-apache 207%/50% 1 10 1 42m php-apache Deployment/php-apache 207%/50% 1 10 4 42m php-apache Deployment/php-apache 207%/50% 1 10 5 43m php-apache Deployment/php-apache 55%/50% 1 10 5 43m php-apache Deployment/php-apache 57%/50% 1 10 5 44m php-apache Deployment/php-apache 57%/50% 1 10 6 44m # Beginning of the plateau php-apache Deployment/php-apache 44%/50% 1 10 6 45m php-apache Deployment/php-apache 45%/50% 1 10 6 46m php-apache Deployment/php-apache 47%/50% 1 10 6 47m php-apache Deployment/php-apache 47%/50% 1 10 6 48m php-apache Deployment/php-apache 44%/50% 1 10 6 49m php-apache Deployment/php-apache 45%/50% 1 10 6 50m php-apache Deployment/php-apache 47%/50% 1 10 6 51m php-apache Deployment/php-apache 46%/50% 1 10 6 52m php-apache Deployment/php-apache 0%/50% 1 10 6 53m # End of the plateau php-apache Deployment/php-apache 0%/50% 1 10 6 58m php-apache Deployment/php-apache 0%/50% 1 10 1 58m # End of workload |
We note that the reaction time of the cluster, from the rest position to the plateau and vice versa, is about 34-5 minutes. Of course, the same behavior can also be seen by analyzing the metrics obtained by Grafana (the stress namespace is the one used for our tests).
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