akkipuneet/nodejsapp

nodejsapp

It is Nodejs based web api which give information about "myapplication" as a GET response to the user request.

$ http://35.227.57.3:8081/info 
  --Response-->
  {
    "myapplication": [
        {
          "version": "v161",
          "description": "pre-interview technical test",
          "lastcommitsha": "7daaa910956a1d7748c57669c8b9bf262cba2b8c"
                    }
                      ]
                        }

An HealthCheck is implemented to track the status of the application when it get deployed in our environment.

$ http://35.227.57.3:8081/healthcheck
  --Response-->
 Healthy

Testing

A test suite is written which consists a test case to check the response code of info api . If the response code is 200 then test suite will pass else it will fail.

CICD

Tools used -

GIT : GitHub is used as SCM repository. A webhook is configured so that when a devloper commits changes it should trigger Jenkins pipeline to build and deploy application.

DOCKER : Docker is used to containerize the application . An health check is implemented in Dockerfile which keeps a track on the status of application. Even if container is up and running there is a possibilty that application is down. In those cases this docker based HealthCheck will mark the status of container as unhealthy.

JENKINS : A jenkinsfile is used to store the pipeline configuration as code in our GitHub. It is used to orchestrate the deployment of nodejs application using stages :

Checkout : This stage checksout code from GitHub Test : Trigger test cases. Build : Builds the docker image and set latest commit number in lastcommitsha, set application version followed by buildnumber Push : Push our image to dockerhub. It uses Jenkins credentials plugin to hide the docker login credentials in jenkins pipeline Deploy : Deploy the Docker image locally and publish our container on 8081 host port. Cleanup : Clean unnecessary files

CLOUD :A GCP compute engine instance is used for this POC.