counterapp's Introduction

Counterapp

write an http api with endpoints defined as below

a) /counter:

 GET will return +1 of existing count

 POST will return +2 of existing count

 DELETE will return -1 of existing count

b) /info:

  GET will return

     - git commit hash

     - branch name of the source code

     - environment name of the app

     - hostname

environment name to be determined based config or system variable during run time

Dockerize the app with minimal foot print

preferably using multi stage building
Create a script which will allow

a) install dependencies

b) create Docker image - Docker tags either can be given as an argument or determine based on git hash
Create a README.MD file to describe how to run the app in local environment.
Design and document CI/CD work flow and code promotion

ex: - dev/qa/stress test/staging/prod etc.
Create helm chart for deploying the application.

helm install

Modify the script on task 3) to use the helm chart to deploy the application to target environment.
Create helm chart and modify the script 3) to do blue green switch.
Add function in script 3) to increase or decrease the pods for the deployment on target enviroment.
Implement sticky session for the api so requests will always go to the same pod during blue green traffic shift
Update the read me files to explain how to use the script

Instructions to run

1.I have created two deployment scripts under templates directory blue.yml and green.yml

2.I have used selectors and labels for switching blue/green deployments

3.# sh run-app.sh to use helm tool to configure the application

4.# sh run-kube.sh to use kubectl commnds to perform expected tasks

To perform blue/green deployment

a.Please switch to helm/counterapp/template/service.yml. And change version number to 1.1

b.For this deployment I have used Kubernetes cluster with 3vcpus and 11 GB ram.

c.Used Ingress as Gate way to route traffic instead Haproxy

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