google-kubernetes-engine

Deploy Go web app in Kubernetes

Create the Docker image

First, we need to containerize our previous webserver application to be able to run it in Kubernetes. We will need a Dockerfile to instruct how we want to build it. Once it's created, we can run:

cd app
docker build -t webserver .

We can see the generated image by running:

docker image ls
---
webserver     latest    d94f50a32c7d   11 seconds ago   292MB

And we will need to push it to a repository. In my case I will use Docker Hub. For this, we will need to rename the image:

docker tag d94f50a32c7d docker.io/arnausenserrich/webserver:v1
---
arnausenserrich/webserver   latest    d94f50a32c7d   8 minutes ago   292MB

And push it to the repository:

docker push docker.io/arnausenserrich/webserver:v1

Deploy to Kubernetes

We could just use kubectl comands to run this image in Kubernetes, but let's create a deployment to easily manage it. Let's apply it:

kubectl apply -f deployment.yaml

Next step is create a service, so all the endpoints can be accessible from inside the cluster with a fixed fqdn:

kubectl apply -f service.yaml

Now we can also expose it, in our case as load balancer service, so it can be accessible from the Internet:

kubectl apply -f lb-service.yaml

Wait few seconds so the load balancer is created and get the public IP:

kubectl get svc pub-webserver --output jsonpath='{.status.loadBalancer.ingress[0].ip}'

Now this application is accessible publicly.