guest-demo

This project contains scripts used in the Kubernetes Autoscaling demo on the Guest team's Dev Show day.

Set-up

The following is the list of software used for this demo:

• Minikube v0.28.2
• Hyperkit v0.20180403-17-g3e954c
• kubectl v1.10+
• Go 1.11

Getting Started

To start up Minikube on Mac OSX:

# start with the Hyperkit driver, enable metrics-server, heapster and registry add-ons
$ make start

To expose the Minikube's private registry:

$ make expose-registry

By default, the Minikube's private registry isn't accessible from the host machine. The expose-registry Make target creates a NodePort service type targeting the registry node, allowing the Docker CLI to push server images tagged as ${minikube_ip}:${node_port}/server to the private registry.

To build and push the Docker image:

# build and push the Docker image to Minikube's local registry
$ make build
$ make push

To deploy the server to Minikube:

$ make deploy
$ kubectl get po
NAME                          READY     STATUS    RESTARTS   AGE
guest-demo-5df8b875b4-lmhcc   1/1       Running   0          14m
$ kubectl logs guest-demo-5df8b875b4-lmhcc
2018/08/29 03:01:00 Listening at port 8080...

To deploy the Horizontal Pod Autoscaler:

$ make autoscale
$ kubectl get hpa
NAME         REFERENCE               TARGETS   MINPODS   MAXPODS   REPLICAS   AGE
guest-demo   Deployment/guest-demo   0%/50%    3         7         3          1m

To delete the Minikube k8s cluster:

$ make purge

Demo

Demo agenda:

• Deploy webserver.
  • Receives a request and write 1GB of data to /dev/null.
• Show pod count.
• Send a single request.
• View server logs.
• Run load tests.
• Wait for pods to scale out.
• Shows load test report.
• Wait for pods to scale in.

The list of commands:

$ make start
$ make expose-registry
$ make build
$ make push
$ make deploy
$ kubectl get po
$ kubectl logs -f <pod>
$ make load/single
$ make autoscale
$ kubectl get hpa -w
$ kubectl get po -w
$ make load/large