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Use case 01

This use case shows how to facilitate local development with services running in remote cluster.

Prerequisities

  1. Install latest Kubectl client.

  2. Install latest Docker.

  3. Install latest Telepresence.

  4. Install latest Minikube.

  5. Install latest Go language.

Architecture

The diagram below depicts how to enable multi cluster development in k8s:

Alt text

Getting Started

Sample application that shows how to connect a frontend in development with a production backend run in remote cluster.

Remote Cluster or Minikube

  1. Deploy backend and frontend applications in remote cluster:
kubectl apply -f backend.yaml,frontend.yaml
  1. Make sure fe-, be- pods and services are up and running :
kubectl get pods,svc 

NAME                            READY   STATUS    RESTARTS   AGE
pod/backend-5cbcdfd67b-x2sbs         1/1     Running   0          23m
pod/frontend-7b77896f9b-5rnhc   1/1     Running   0          102s


NAME             TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)   AGE
service/be-srv   ClusterIP   100.68.217.68   <none>        80/TCP    23m
service/fe-srv   ClusterIP   100.70.86.99    <none>        80/TCP    4m10s

Localhost

  1. Create new service in remote cluster and forward to local server:
telepresence --swap-deployment frontend --namespace default  --run-shell
python3 -m http.server 8000

OR:

telepresence --swap-deployment frontend --namespace default --expose 8000 \
--run python3 -m http.server 8000
  1. Make sure a new helloworld deployment created:
kubectl get pods,svc -n default

NAME                                                       READY   STATUS    RESTARTS   AGE
hello-world-5b976dc979-zk7qv   1/1       Running   0          9s

Note: To stop telepresence, please type 'exit' in terminal, which will automatically delete telepresence deployment from remote cluster.

  1. In another terminal, make sure can reach from backend services running in remote cluster to newly created hello-world service in localhost:
curl http://hello-world:9000

Hello, world!

python3 helloworld.py

127.0.0.1 - - [02/Nov/2018 13:17:17] "GET / HTTP/1.1" 200 -

Uninstall

  1. Uninstall backend application in remote cluster:
kubectl delete -f backend.yaml,frontend.yaml
  1. To stop Telepresence, type 'exit' or CTRL-D in terminal telepresence is active.

References

Kubehelloworld project authored by Sal Rashid.

Authors

Opengov Devops team.