Kubernetes Docker Example Setup

This code can be used to run an application on a kubernetes setup using docker on MacOS, Linus, or Windows.

Kubernetes Introduction

Kubernetes is a portable, extensible open-source platform for managing containerized workloads and services, that facilitates both declarative configuration and automation. It has a large, rapidly growing ecosystem. Kubernetes services, support, and tools are widely available.

(Source: https://kubernetes.io/docs/concepts/overview/what-is-kubernetes/)

Install Kubernetes On Docker

Download and install Docker here: https://docs.docker.com/docker-for-mac/install/ .

Download and Install kubectl (Kubernetes Command Line Tool) here: https://kubernetes.io/docs/tasks/tools/install-kubectl/ .

Go to Docker Preferenes and start Kubernetes from the Kubernetes tab. This may take a while.

When Kubernetes is up and running, check kubernetes cluster info.

$ kubectl version
$ kubectl cluster-info

Running a Webserver:

$ kubectl run —-image=nginx webserver-yourname

Check your nginx deployment, ReplicaSet, and pods:

$ kubectl get deploy
$ kubectl get rs
$ kubectl get pod

Port Forward from container to your local system:

$ kubectl get pod
$ kubectl portforward <pod-name> 5000:80

Expose the node outside of the cluster:

$ kubectl expose deploy webserver-yourname --type=NodePort
$ kubectl get services

^ This expose command will assign a random port to your webserver. Let's call it: <rand-port> Access the node port at: localhost:<rand-port>

Download or clone the code and run this command in the root dir:

docker build -t kubernetes-node .

Apply and Expose:

$ kubectl apply -f deployment.yaml
$ kubectl expose deploy kubernetes-node-deployment --type=NodePort

Find port for the kubernetes-node-deployment here:

$ kubectl get service

^ Let's call it:

<kub-node-port>

Witness your first ever application at:

localhost:<kub-node-port>

Voila.