Cloud Native Application Architecture Nanodegree

TechTrends Project

Sharing platform project for Cloud Native Fundamentals module.

Tech Stack

Web App

• Python
• Flask
• SQLite

Containerization & Virtualization

• Docker
• Vagrant

CI/CD & GitOps

• Github Actions
• ArgoCD

Deployment & Management of Containers

• Kubernetes
• K3S

Running TechTrends Project

Building TechTrends Image

From the repository's root folder, build the app image:

$docker build -t YOUR_NAME/techtrends .

The build process will install all dependencies and start the SQLite DB, then expose port 3111 for this image.

You might want to test the application before building its image by reading the instructions here.

Running the Image

Run a container and test it locally:

docker run -d --name techtrends -p HOST_PORT:3111 YOUR_NAME/techtrends

Preparing K8S Environment

With vagrant correctly setup, a simple vagrant up and vagrant ssh will suffice to start the environment.

As superuser, install K3S, a lightweight K8S distribution: curl -sfL https://get.k3s.io | sh -

This installation process may take a while.

Check the availability with kubectl get node.

Applying K8S Manifests Only

Apply the kubernetes/namespace.yaml, kubernetes/deploy.yaml and kubernetes/service.yaml for local/sandbox namespace.

$ kubectl apply -f namespace.yaml
$ kubectl apply -f deploy.yaml
$ kubectl apply -f service.yaml

Check the resources created for the sandbox namespace:

$ kubectl get all -n sandbox

NAME                              READY   STATUS    RESTARTS   AGE
pod/techtrends-577bd4f766-nmchn   1/1     Running   1          44h

NAME                 TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
service/techtrends   ClusterIP   10.43.170.37   <none>        4111/TCP   44h

NAME                         READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/techtrends   1/1     1            1           44h

NAME                                    DESIRED   CURRENT   READY   AGE
replicaset.apps/techtrends-577bd4f766   1         1         1       44h

Test the service from cluster ip:

$ curl -s -i 10.43.170.37:4111 | head -n 1 -

Expose as a node port to test from your local browser:

$ kubectl apply -f nodeport.yaml

Check the webapp running from VM private ip and node port exposed, i.e, 192.168.50.4:30001