Petstore: Build with docker, Deploy to kubernetes

Docker and kubernetes manifest files to transform and deploy legacy monolith petstore app with kubernetes and istio, without changes in application code

References

based in a tutoriel of David Gageot on devoxx 2018 prez :

• youtube -> Docker, Kubernetes et Istio, c'est utile pour mon monolithe? (D. Gageot)

• github -> A Java Petstore using the Java EE 7 (Antonio Goncalves)

Requirements

You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster.

e.g : for a local cluster in windows 10 pro

• Enable Hyper-V
• Install Docker for Windows and enable Kubernetes
• enable ingress : install ingress controller in your local cluster
  • https://docs.docker.com/ee/ucp/kubernetes/cluster-ingress/ingress/
  • docker/for-win#1901
  • https://stackoverflow.com/questions/59255445/how-can-i-access-nginx-ingress-on-my-local
• add local dns name petstore.lol in your host file. in windows C:\Windows\System32\drivers\etc\hosts

Run in local cluster

• build & tag petstore image with

cd k8s

docker build -t citizendiop/petstore-ee7 .

• build & tag nginx front image

cd front

docker build -t citizendiop/petstore-nginx:v1 .

• run petstore manualy to test docker run -it -p 8080:8080 citizendiop/petstore-ee7

Once deployed go to the following URL:

http://localhost:8080/applicationPetstore

stop container

• tag image

docker tag citizendiop/petstore-ee7:latest citizendiop/petstore-ee7:v1

• push

docker login

docker push citizendiop/petstore-ee7:v1

• create custom namespace

kubectl apply -f namespaces/

• deploy resources to kubernetes cluster

kubectl apply -f k8s/

• check

if you have kubernetes dashboard, check http://localhost:8001/api/v1/namespaces/kube-system/services/https:kubernetes-dashboard:/proxy/

in command line,

• to see the status of each pod.

kubectl get po -o wide --watch

• to check deployed resources

kubectl get all --namespace=petstore-development

kubectl get deploy,svc,pods --namespace=petstore-development

• to check namespaces

kubectl get namespaces --show-labels

• to get logs

kubectl logs -f pod/petstore-645669b85f-66x9b

• to kill pods

kubectl delete pod/petstore-645669b85f-66x9b

kubernetes will restart pod automaticaly

• delete all resources in namespace

kubectl delete -f k8s/

or

kubectl delete -f namespaces\namespace-development.yaml

TODO

1. Dockerise application with multi-stage build
2. Deploy to kubernetes with external service
3. Improve app with facade pattern or sidecar
   • add nginx http server (with gzip, 404 and nice url)
   • Set ingress service for local 'petstore.lol': one domain -> One service
4. Using Kubernetes Namespaces to Manage Multiple Environments (development/staging/production)
5. init isio service mesh (based on facade / sidecar pattern)

• manage the statefull aspect of app
• add github actions to build and push image to dockerhub
• set up with helm
• set up with kustomize
• with jenkins-x or github actions, automate CI/CD with multiple environments on Kubernetes cloud(GKE or AKS) using GitOps