kubernetes-hpa-example

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kubernetes-hpa-example

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Example of Horizontal Pods Autoscaler using minikube

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Motivation for this project.

- To get to know how to do Horizontal Scaling of Containerized application using Kubernetes. This example provides a demonstration on Horizontal Pods Autoscaling(HPA) on a node application.

How to set up the environment and required tools?

1. Docker for Mac/Ubuntu/Windows.

- This is used for creating a containerized application and pushing an image to DockerHub to access it in Kubernetes configuration. You can also use a locally built image. But it is always better to push DockerHub to have an ease of access anywhere whether locally or AWS.

- for Mac, `install Docker for Moc`

2. Minikube

- Minikube is a tool that makes it easy to run Kubernetes locally. Minikube runs a single-node Kubernetes cluster inside a VM on your laptop for users looking to try out Kubernetes or develop with it day-to-day. [https://github.com/kubernetes/minikube]

- for Mac, `brew cask install minikube`

2. VirtualBox

- Virtual Box is used by Minikube to run a virtual machine for cluster set up purpose.

- for Mac, `brew cask install virtualbox`

3. Kubectl

- Kubectl is the command-line interface that lets you interact with Kuberentes. Run brew install kubectl in your Terminal.

- Minikube will automatically install it as a dependency.

Steps to run the sample HPA after installing required tools.

- Below steps are to setting up Minikube.

- Run `minikube start`. This command will take time on first run.
    - Check Kubectl installation by running `kubectl version`
    - Enable metrics-server using `minikube addons enable metrics-server`
        - metrics-server is used for monitoring the pod resource. e.g CPU utilization, memory
        - check the metrics-server using `kubectl top node`, enabling can take few seconds, so be patient
    - If enabling `metrics-server` doesn't work try this step:
        - `git clone https://github.com/kubernetes-incubator/metrics-server.git`
        - `cd metrics-server`
        - `kubectl create -f deploy/1.8+/`
        - check the metrics-server using `kubectl top node`

- Clone this project
    - be in root of my project, Run `kubectl apply -f k8s`
    - Open new terminal Run `minikube dashboard` to open Kubernetes dashboard
    - Run `minikube service node-example` to check the node-app pod(container) is working or not
    - Check HPA demo live:
        - Open three different terminal
        - Install `watch` if not installed using `brew install watch`.
        - Terminal 1 -> Run `watch -n 1 kubectl get pods`
        - Terminal 2 -> Run `watch -n 1 kubectl get hpa`
        - Terminal 3 -> Run `ab -c 5 -n 1000 -t 100000 http://192.168.99.100:30001/`. Used Apache Benchmark here.
        - You can see authoscalling of pods in Terminal-1.

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