Create Kubernetes Cluster with Vagrant

Run it;

cd Provisioning
vagrant up

After all machines are up reload them: vagrant reload

Playground

1. Run kubectl apply -f apps/1-configmap.yml command to disable ssl-redirect forcement on Nginx Ingress Controller.
2. Run kubectl apply -f apps/2-metallb-configmap.yml command to configure MetalLB
3. Run kubectl apply -f apps/3-basic-app.yml command to create custom service and deployment. It's Python Flask app and used to write hostname.
4. Run kubectl apply -f apps/4-ingress.yml command to create Nginx Ingress Controller.

Reach and application with Load Balancer IP address type kubectl get services --namespace ingress-nginx. Output should be;

NAME                    TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)                      AGE
service/ingress-nginx   LoadBalancer   10.107.225.26   172.81.81.101   80:32555/TCP,443:30497/TCP   15m

Get EXTERNAL-IP value and run it;

while true; do sleep 1; curl http://172.81.81.101/basic-app;echo -e '\n';done

Expected result, two different hostname should be written! For instance;

<h1>Hostname: basic-app-deployment-b9c7c9bb4-sssmx</h1>
<h1>Hostname: basic-app-deployment-b9c7c9bb4-9xvtc</h1>
<h1>Hostname: basic-app-deployment-b9c7c9bb4-sssmx</h1>
<h1>Hostname: basic-app-deployment-b9c7c9bb4-9xvtc</h1>
<h1>Hostname: basic-app-deployment-b9c7c9bb4-sssmx</h1>
<h1>Hostname: basic-app-deployment-b9c7c9bb4-9xvtc</h1>
<h1>Hostname: basic-app-deployment-b9c7c9bb4-sssmx</h1>

On the other terminal panel, write vagrant ssh worker02 and connect to worker machine. After that get the running containers with sudo docker container ls command and catch the Flask app container id kill it. Service will continue to respond.

Resources

Kubernetes Offical Documentation

Nginx Ingress Controller

MetalLB

and thanks to all stackoverflow heroes!