Python Web App

This is a basic Hello world Web App using python

Major tools used for the App.

• Python
• Flask
• Docker
• Kubernetes
• Helm

In your machine(I'm using Amazon Linux2), make sure you have them installed

Installations

Python installation:

sudo yum install python34 python34-pip

Docker installation:

sudo yum install docker
sudo usermod -a -G docker ec2-user (This command is used to add ec2 user into docker group)

Kubectl installation:

curl -o kubectl https://s3.us-west-2.amazonaws.com/amazon-eks/1.23.7/2022-06-29/bin/linux/amd64/kubectl
chmod +x ./kubectl
mkdir -p $HOME/bin && cp ./kubectl $HOME/bin/kubectl && export PATH=$PATH:$HOME/bin

Helm installation:

curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
chmod 700 get_helm.sh
./get_helm.sh

Folder Tree

├── app.py
├── Dockerfile
└── requirements.txt

Creating Docker image

The following command is used to create docker image

docker build -t itzprashanth/python-docker-app:latest .

Push the image to your favourite repository

docker push itzprashanth/python-docker-app:latest

Create a helm chart using following command

helm create python-docker-app

Updates made on helm charts

• Update python-web-app/templates/deployment.yaml file, I updated containerPort to 5000
• Update python-web-app/values.yaml file with required details, in my case I updated image repository, tag of docker image to latest, autoscaling values and service type to LoadBalancer

autoscaling:
  enabled: true
  minReplicas: 1
  maxReplicas: 5
  targetCPUUtilizationPercentage: 40

• To dry run the helm chart, run the following command

helm install --dry-run ./python-web-app/ --generate-name

• To run the helm chart

helm install ./python-web-app/ --generate-name

• To list the helm charts installed

helm list

• To list the running pods

kubectl get pods

• If you found any errors in the running pods, run the following command to get the details of the pods

kubectl describe pod python-web-app-1664126080-6bfcdcfdfc-vskk9

• To delete the helm chart, run the following command

helm uninstall python-web-app-1664126080

Result

Access the website from www.prashanthg.tk

Routes

www.prashanthg.tk/app

www.prashanthg.tk/time