Ingress from scratch

100Days Resources

Learning Resources

TODO

Example Notes

If you are new to 100 Days Of Kubernetes, have a look at the previous days to fill in the gaps and fundamentals for today:

Day 4: Looking at Services

Day 11: More exercises on Services

Day 13: Ingress

Day 31: Service Mesh

Resources

  1. Do I need a service mesh or is Ingress enough? https://www.nginx.com/blog/do-i-need-a-service-mesh/
  2. Check the specific installation guide https://kubernetes.github.io/ingress-nginx/deploy/
  3. Tutorial setup https://medium.com/analytics-vidhya/configuration-of-kubernetes-k8-services-with-nginx-ingress-controller-5e2c5e896582
  4. Comprehensive Tutorial by Red Hat https://redhat-scholars.github.io/kubernetes-tutorial/kubernetes-tutorial/ingress.html
  5. Using Ingress on Kind cluster https://kind.sigs.k8s.io/docs/user/ingress/#ingress-nginx
  6. More on installing ingress on kind https://dustinspecker.com/posts/test-ingress-in-kind/

Install

The installation will slightly depend on the type of cluster that you are using.

For this tutorial, we are going to be using the docker-desktop cluster

We need two main components

  1. Ingress Controller

  2. Ingress resources

    Note that depending on the Ingress controller that you are using for your Ingress, the Ingress resource that has to be applied to your cluster will be different. In this tutorial, I am using the Ingress Nginx controller.

Let's set everything up.

We are going to be using the NGINX Ingress Controller. With the NGINX Ingress Controller for Kubernetes, you get basic load balancing, SSL/TLS termination, support for URI rewrites, and upstream SSL/TLS encryption

First off, let's clone this repository: https://github.com/AnaisUrlichs/ingress-example

git clone <repository>

cd ingress-example

cd app-one

now build your Docker image

docker build -t anaisurlichs/flask-one:1.0 .

You can test it out through

docker run -p 8080:8080 anaisurlichs/flask-one:1.0

And then we are going to push the image to our Docker Hub

docker push anaisurlichs/flask-one:1.0

We are going to do the same in our second example application

cd ..
cd app-two

build the docker image

docker build -t anaisurlichs/flask-two:1.0 .

push it to your Docker Hub

docker push anaisurlichs/flask-two:1.0

Now apply the deployment-one.yaml and the deployment-tow.yaml

kubectl apply -f deployment-one.yaml
kubectl apply -f deployment-two.yaml

Make sure they are running correctly 

kubectl get all

Installing Ingress Controller

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.44.0/deploy/static/provider/cloud/deploy.yaml

Installing Ingress Resource

kubectl apply -f ingress.yaml

make sure that everything is running correctly

kubectl get all -n ingress-nginx

Making paths happen https://github.com/kubernetes/ingress-nginx/issues/3762