K8s-Flask-Postgres-Redis

Deployment Flask app with Postgres & Redis using Kubernetes in Minikube cluster.

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What i did?

• creating docker file for my app.py

• push docker image to docker hub

• creating deployment & service for (flask, postgres and redis)

• putting sensitive data to secrets file

• using configMap for environment variables

• creating Persistent Volume(pv) & bound it to Persistent Volume Claim(pvc)

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How to deploy?

• make sure minikube up and running minikube status, if not minikube start.

1. after clone this repo simply run this command: kubectl apply -f k8s/.

2. check three pods are running kubectl get pods.

3. then we need to check those pods work well together by using /health end point using curl:

   • we need to run curl to /health endpoint in flask pod.
   • first get pod name kubectl get pods find one that start with flask-somehash-somehash.
   • then get the service kubectl get svc to get the ClusterIp of flask pod.
   • goto exec mode of flask pod kubectl exec -it flask-somehash-somehash -- bash.
   • using curl curl http://flask-ClusterIp:5000/health you should get "status": "connected to both redis and database".

4. check PV work well:

   • again goto exec mode of flask pod kubectl exec -it flask-somehash-somehash -- bash.
   • change directory to /datacd /data then create new file echo 'persistent data' > test.txt'.
   • delete flask pod kubectl delete -f k8s/flask-app.yaml.
   • recreate it again kubectl apply -f k8s/flask-app.yaml.
   • goto flask pod exec mode, check the file cat /data/test.txt.

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• in case my image not availabe in docker hub any more, you can build it by you self, run this command docker build -t [your-dockerhub-username]/[image-name]:[tag] .
• then push the image to you docker hub, remember to change the container image in flask-app.yaml file to [your-dockerhub-username]/[image-name]:[tag], docker push [your-dockerhub-username]/[image-name]:[tag]