deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: flask-app-pod
spec:
  selector:
    matchLabels:
      app: gunicorn-flask
      version: one
  replicas: 3
  template:
    metadata:
      labels:
        app: gunicorn-flask
        version: one
    spec:
      containers:
      - name: hello-app-1
        image: "giuliohome/gcp-flask-sqlserver-k8s:latest"
        env:
        - name: DB_HOST 
          value: $DB_HOST # private ip 
        - name: DB_USERNAME
          value: $DB_USERNAME
        - name:  DB_PASSWORD
          value: $DB_PASSWORD
# export DB_HOST="10.17.208.3"
# read DB_HOST < <(terraform output -raw private_ip_address)
# export DB_HOST=$DB_HOST
# gcloud container clusters get-credentials my-cloud-giulio-dev-v1-mytf --region us-central1 --project my-cloud-giulio
# envsubst < deployment.yaml | kubectl apply -f -
# see https://serverfault.com/a/843883
# gcloud container clusters get-credentials giulio-myterraform-gke-dev  --zone=us-central1 
# kubectl apply -f deployment.yaml
# ... services.yaml and ingress
# gcloud container clusters update giulio-myterraform-gke-dev  --zone=us-central1 --logging=SYSTEM,WORKLOAD --monitoring=SYSTEM

#│ Error: googleapi: Error 403: Service Networking API has not been used in project 553502752091 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/servicenetworking.googleapis.com/overview?project=553502752091 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry.
# maybe also Cloud SQL Admin API