Deploy to Kubernetes running on Google Container Engine

We will setup a small cluster of 3 n1-standard-1 instances. They cost around $25 per month. So the cluster will cost you somewhere above $75 a month for the servers.

This is just a few notes from the tutorial from kubernetes.io.

Setup needed before we start with the cluster

• Install google cloud sdk

brew cask install google-cloud-sdk

• Create a project on google cloud

Go to console.cloud.google.com and set it up. Remember the project id.

• Install kubectl

  gcloud components install kubectl

• Have a sample project.

In a server.js file

var http = require('http');
var handleRequest = function(request, response) {
  console.log('Received request for URL: ' + request.url);
  response.writeHead(200);
  response.end('Hello World!');
};
var www = http.createServer(handleRequest);
www.listen(8080);

• Create a docker file.

Dockerfile

FROM node:4.4
EXPOSE 8080
COPY server.js .
CMD node server.js

• Build the docker container

docker build -t gcr.io/$PROJECT_ID/hello-node:v1 .

• Authenticated for the google api

gcloud auth login
gcloud config set project PROJECT_ID

• Push the container to the google docker registry

gcloud docker -- push gcr.io/$PROJECT_ID/hello-node:v1

Create a cluster

• Create a cluster

gcloud container clusters create hello-world

Fetch configuration needed

gcloud container clusters get-credentials hello-world

I had some missing credentials. Had to run this command again:

gcloud auth application-default login

• Create a pod

kubectl run hello-node --image=gcr.io/$PROJECT_ID/hello-node:v1 --port=8080

Allow external traffic to the application

kubectl expose deployment hello-node --type="LoadBalancer"

To find the ip adress run:

kubectl get services hello-node

You can now see your service running on you kube cluster.

View the setup

kubectl get deployments
kubectl get pods
kubectl logs 
kubectl cluster-info
kubectl get events
kubectl config view
kubectl get services hello-node

Run kubectl cluser-info and you will see a list of all Kubernetes services running. One is the Kubernetes-Dashboard.

If you open that url in the browser you will be prompted for a username and password. These can we viewed (in plain text) with:

gcloud container clusters describe 

Somewhere in there you will find a username and password.

Scaling

Scale up? Or scale down? Define how many instance you want to have running and the rest is managed for you.

kubectl scale deployment hello-node --replicas=4

Deploy a new version

Modify you application.

docker build -t gcr.io/$PROJECT_ID/hello-node:v2 .
gcloud docker push gcr.io/$PROJECT_ID/hello-node:v2

To run the new version we set which image we want kube to run.

kubectl set image deployment/hello-node hello-node=gcr.io/$PROJECT_ID/hello-node:v2

Clean up you cluster

If you did this to test it out you might want to remove your cluster now.

kubectl delete service,deployment hello-node
gcloud container clusters delete hello-world

List all the images you uploaded

gsutil ls

Remove them:

gsutil rm -r gs://artifacts.$PROJECT_ID.appspot.com/

That it.

Written by Simon Ström as a way to remember. It's a dev log of thinks I want to remember.