We will use the hey utility to perform load testing. Since your application has already been deployed, run the following command to do the load test:
$ hey -z 30s -c 500 http://py-time.default.35.226.198.46.sslip.io
Once the command has executed, run the following command to get the currently running instances of the py-time pods:
| $ kubectl get pod | ||||
| NAME | READY STATUS RESTARTS | AGE | ||
| py-time-00001-deployment-52vjv 2/2 | Running | 0 | 44s | |
| py-time-00001-deployment-bhhvm 2/2 | Running | 0 | 44s | |
| py-time-00001-deployment-h6qr5 2/2 | Running | 0 | 42s | |
| py-time-00001-deployment-h92jp 2/2 | Running | 0 | 40s | |
| py-time-00001-deployment-p27gl 2/2 | Running | 0 | 88s | |
| py-time-00001-deployment-tdwrh 2/2 | Running | 0 | 38s | |
| py-time-00001-deployment-zsgcg 2/2 | Running | 0 | 42s | |
As we can see, Knative has created seven instances of the py-time pod. This is horizontal autoscaling in action.
Now, let’s look at the cluster nodes by running the following command:
$ kubectl get nodes
NAME STATUS AGE gke-cluster-1-default-pool-353b3ed4-js71 Ready 3m17s gke-cluster-1-default-pool-353b3ed4-mx83 Ready 106m gke-cluster-1-default-pool-353b3ed4-vf7q Ready 106m
As we can see, GKE has created another node in the node pool because of the extra burst of traffic it received. This is phenomenal, as we have the Kubernetes API to do what we want. We have automatically horizontally autoscaled our pods. We have also automatically horizontally autoscaled our cluster worker nodes. This means we have a fully automated solution for runningcontainers without worrying about the management nuances! That is open source serverless in action for you!
Summary
This chapter covered CaaS and serverless CaaS services. These help us manage container applications with ease without worrying about the underlying infrastructure and managing them. We used Amazon’s ECS as an example and deep-dived into it. Then, we briefly discussed other solutions that are available on the market.
Finally, we looked at Knative, an open source serverless solution for containers that run on top of Kubernetes and use many other open source CNCF projects.
In the next chapter, we will delve into IaC with Terraform.
