Local Kubernetes LoadBalancer with Ingress

This repository is a demo repository for my personal blog post.

In this demo repo, we are going to deploy a local Kubernetes cluster using Kind, create a load balancer using MetalLB and manage ingress using NGINX Ingress.

Two applications will be deployed in the cluster:

• app-load-balancer: Kubernetes deployment exposed by service of type LoadBalancer
• app-ingress: Kubernetes deployment exposed by a service of type ClusterIp that gets external traffic because of the Ingress.

Running the demo

If using a MacOS make sure you have docker-mac-net-connect installed and running (this is explained in the blog post).

1. Create a Docker bridge network

The MetalLB IPs need to be in the range of the IPs of the cluster. I good strategy is to before the Kubernetes cluster creation to create the range of IPs we want our Kubernetes cluster to be in. This way the Kubernetes manifest for the MetalLB ip pool (IPAddressPool) won't need to be modified. This docker network will be used by our Kind cluster on the following step.

docker network create --subnet 172.100.0.0/16 custom-kind-network

2. Install Devbox dependencies of the demo

devbox shell

3. Create a Kind cluster and install MetalLB and Ingress NGINX

devbox run init

This installs and waits for the resource to be healthy so it might take a few minutes to finish this command execution.

4. Install app-load-balancer application

devbox run app-load-balancer

5. Install app-ingress application

devbox run app-ingress

6. Check access to the app-load-balancer application

APP_LB_IP=$(kubectl get svc app-load-balancer -n default -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
echo "Open your browser on the following URL: http://${APP_LB_IP}"
curl $APP_LB_IP

7. Check access to the app-ingress application

The app-ingress application is exposed by the NGINX Ingress Load Balancer and routed accordingly by the Ingress resource.

Get the NGINX Ingress IP

INGRESS_LB_IP=$(kubectl get svc ingress-nginx-controller -n ingress-nginx -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
echo "Add $INGRESS_LB_IP to /etc/hosts"

Now add this IP to the /etc/hosts file

echo "$INGRESS_LB_IP app-ingress.local" | sudo tee -a /etc/hosts

Now access http://app-ingress.local. Check if the application is accessible.

When done, remember to delete the /etc/hosts entry.

8. Destroy the demo