ashwinexe / GHW-December

Notes and resources for GHW December stream

GHW-December 🎅🎅

Notes and resources for GHW December stream on Deploying your first Kubernetes Cluster

Watch the recording of all three parts here:

• Part 1
• Part 2
• Part 3

Setting up 🖥️

1. Install Git
2. Install Node
3. Install Docker Desktop
4. Create an account on Docker Hub
   1. Login to Docker Desktop with your docker account
   2. Login to Docker CLI docker login (more info)
5. Clone this repo
   1. https: https://github.com/ashwinexe/GHW-December.git
   2. ssh: [e-mail]:ashwinexe/GHW-December.git

Conterize your app 🚀

1. Check out the Dockerfile to understand what's happening
2. Login to your docker account in your shell docker login
3. Run docker build -t <docker_username>/<image_name>:<version_number> .
4. It shoudl look like this:

   ➜  GHW-December git:(main) ✗ docker build -t ashwinexe/ghw:1.0 .
Sending build context to Docker daemon  9.639MB
Step 1/6 : FROM node:current-slim
 ---> b131f467b9ea
Step 2/6 : LABEL MAINTAINER="[e-mail]"
 ---> Running in ad644f733bb0
Removing intermediate container ad644f733bb0
 ---> 80536b85f226
Step 3/6 : COPY . /src
 ---> a0d5b1092b14
Step 4/6 : RUN cd /src; npm install
 ---> Running in 69961af002d6

up to date, audited 97 packages in 5s

12 packages are looking for funding
  run `npm fund` for details
Successfully built 1f2bfa5b0245
Successfully tagged ashwinexe/ghw:1.0

Notice the "." in the end is crucial, it tells docker that all the files in the local directory get compressed and sent to the Docker daemon.

5. Run your docker image with port exposed:
   1. docker run -p 8080:8080 ashwinexe/ghw:1.0
   2. Check localhost:8080 in your browser

Fact: 8080:8080 means any request coming for port 8080 will be forwarded to service running on port 8080 inside your container. simply put
docker run -p Port for Outside World: Actual Port of service in container ashwinexe/ghw:1.0

6. Push your image to dockerhub docker push <username>/<image>:<version>
   1. for eg: in my case it'd be docker pull ashwinexe/ghw:1.0

You can use my deployed version if you wish so: docker pull ashiwnexe/ghw:1.0

Enable Kuberenetes 🕹️

There are several ways to run kubernetes locally on your machine. Docker Desktop is the easier way to get started

Still curious? Check out Kind, minikube and kubeadm which are also popular choice to run kubernetes locally

• Run Docker Desktop -> Settings -> Kubernetes -> Toggle Enable Kubernetes -> Check Kubernetes status at the bottom

• Open command terminal and run kubectl get nodes your output should look like:

kubectl get nodes
NAME             STATUS   ROLES           AGE     VERSION
docker-desktop   Ready    control-plane   5d11h   v1.25.2

Hurray! You got your own Kubernetes cluster running! 🥳

So you containerized a Node.js web application into a container image and stored it on Docker Hub. You're about to deploy that application to your cluster inside a Kubernetes Pod.

Configure Kubenetes

• kubectl apply -f pod.yaml //applies Pod configuration
• kubectl apply -f service-local.yaml //applies Service configuration to expose port locally
• Verify service

  $ kubectl get svc
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP          9d
svc-local    NodePort    10.96.122.250   <none>        8080:30000/TCP   7h33m

Check the output at localhost:30000 (or where NodePort is exposed in your service-local.yaml file)

Extra Resources 💃

• Workshop Slides
• Containerzie a node app
• Hosting a simple static app using Express
• ExpressJS tutorial