Redeploy Flask App on GKE(Google Kubernete Engine)

Some things need to take attention

Docker does not support overwrite images!!!
To update code, we need to set up new image tags.

My Code to auto-deploy Local Flask to GKE

#!/bin/bash

while getopts "t:" opt; do
  case $opt in
    t)
      arg="$OPTARG"
      ;;
    \?)
      echo "Invalid option" >&2
      exit 1
      ;;
  esac
done

echo "The tag is: $arg"    # add this line

# docker rmi khipu_flask
docker build -t khipu_flask:$arg .
docker tag khipu_flask:$arg gcr.io/flaskkhipu/khipu_flask:$arg

# gcloud container images delete gcr.io/flaskkhipu/khipu_flask --force-delete-tags
docker push gcr.io/flaskkhipu/khipu_flask:$arg
# docker kubectl expose deployment khipu-deploy  --type=LoadBalancer --port 80 --target-port 8080
kubectl set image deployment/khipu-deploy khipu-flask=gcr.io/flaskkhipu/khipu_flask:$arg

Run use

sh kubernetes_deploy.sh -t [tag_name]

Also for the Docker file and Deploy.yaml:

FROM python:3.9
WORKDIR /khipu_flask
ADD . /khipu_flask
COPY main.py /khipu_flask
RUN pip install --trusted-host pypi.python.org -r /khipu_flask/requirements.txt
RUN pip install gunicorn
EXPOSE 8080
CMD ["gunicorn", "main:app", "--config=config.py"]

apiVersion: apps/v1
kind: Deployment
metadata:
  name: khipu-deploy
spec:
  replicas: 3
  selector:
    matchLabels:
      app: app
  template:
    metadata:
      labels:
        app: app
    spec:
      containers:
      - name: khipu-flask
        image: gcr.io/flaskkhipu/khipu_flask
        ports:
        - containerPort: 8080

Other Useful Commands

1. gcloud container images list to see available images on gcloud
2. kubectl rollout status deployment/khipu-deploy to check the rollout status