docker-flask-template

This is a basic docker container template, containing a Flask app and a Postgres database both registered as services in a docker-compose.

Since both containers belong to the same default network, Flask app is able to see the database.

In addition, after creating the images, both images are pushed into dockerhub, so they are used in /kubernetes solution(check the folder within the repository).

Given the docker-compose file, I used kompose in order to export all the kubernetes manifests needed in order to install and scale up the containers previously mentioned.

Finally, within /terraform, there are templates for installing(in a single gcp instance), all the services defined in docker-compose.

In order to startup the containers, please run:

docker-compose -f docker-compose.yaml up --no-start

docker-compose -f docker-compose.yaml start

and to stop the containers:

docker-compose -f docker-compose.yaml stop

Stop and remove containers, networks..

docker-compose -f docker-compose.yaml down

Scaling up/down containers by using Kubernetes

Minikube was used in order to emulate a kubernetes cluster locally. Kubectl is also installed in order to interact with Kubernetes master. https://kubernetes.io/docs/tasks/tools/ Once Minikube is downloaded, It can be started by executing minikube start

Deploying all the pods

kubectl apply -f db-deployment.yaml kubectl apply -f flask-deployment.yaml kubectl apply -f db-claim0-persistentvolumeclaim.yaml

Installing the services

kubectl apply -f db-service.yaml kubectl apply -f flask-service.yaml

Forwarding the ports for accesing

kubectl port-forward svc/flask 5000:5000 kubectl port-forward svc/db 5432:5432

Download Terraform

https://www.terraform.io/

Create resources

terraform apply

Destroy resources

terraform destroy