Application Deployment in Kubernetes Cluster

This repository contains deployment manifest to deploy app-version-info application in Kubernetes cluster

Table of Contents

• Introduction
• Deployment Manifest
• Application Image
• Application Deploy and Test Script
• Deploy Application in Kubernetes Cluster
• Deployment Testing Results
• Enhancement Production Readiness

Introduction

This repository used to deploy and expose application in Kubernetes cluster.

Deployment Manifest

This here file is used to create Namespace,Deployment, Service

• Namespace: Creates technical-test namespace
• Deployment: Creates app-version-info deployment in namespace technical-test
• Service: Expose the application on port 5000 on the host (NodePort)

Application Image

This application uses latest image from dockerhub repository aparnamane/app-version-info:7d7db9e build using application code from this repo

Application Deploy and Test Script

The deploy and test script is available here. Its a bash script used to automate application deployment, service creation and application testing.

Deploy Application in Kubernetes Cluster

Deploy from local machine

• Install Kubernete command line tool kubectl as instructed here

• Create kubeconfig file under ~/.kube directory as below with specifying respective values as config-file-name, cluster-name etc., sample kubeconfig file is here

kubectl config --kubeconfig=<config-file-name> set-context <context-name> —cluster=<cluster-name> --namespace=<namespace-name> --user=<user-name>

• Clone the repository to local machine

git clone git@github.com:aparnamane/kubernetes-app-deployment.git

• Make the script deploy.sh executable

chmod u+x deploy.sh

• Run the script

./deploy.sh

Deploy from the cluster master node

• Login to the master node

• Clone the repo or copy the app-version-info-deploy.yaml and deploy.sh files

• Make the script deploy.sh executable

chmod u+x deploy.sh

• Run the script

./deploy.sh

Deployment Testing Results

• This application deployment has been tested in the two node cluster running kube version 1.13

• Results can be seen as below:

cloud_user@ip-10-0-1-101:~$ ./deploy.sh
namespace/technical-test created
deployment.apps/app-version-info created
service/app-version-info-service created
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
app-version-info   0/1     1            0           0s
NAME                       TYPE       CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
app-version-info-service   NodePort   10.101.185.114   <none>        5000:32765/TCP   0s
NAME                                READY   STATUS              RESTARTS   AGE
app-version-info-5bf75cbbb8-mc7b8   0/1     ContainerCreating   0          0s
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   153  100   153    0     0  30600      0 --:--:-- --:--:-- --:--:-- 76500
{
  "myapplication": [
    {
      "description": "pre-interview technical test",
      "lastcommitsha": "7d7db9e",
      "version": "1.0"
    }
  ]
}

Enhancement Production Readiness

• Multi node cluster for high avability.
• Cluster access policies need to apply using RBAC.
• Auto scaling can be considered to scale up/down the application pods.
• Cluster upgrade strategy