hello-world-k8s-python

Travis-CI:

Prerequisites

• A Locally running kubernetes cluster(MiniKube) or Running kubernetes cluster in your environment
• Basis kubernetes tools like kubectl (to interact with kubernetes cluster), helm(for deployment)
• A Terminal to run all the commands
• Access service endpoint through any browser

Installation

• To install kubernetes with MiniKube

  • Minikube

• To Install Kubectl

  • Kubectl

• To install Helm(Package Manager) & Tiller(Helm Server) for kubernetes cluster

  • Helm

Important Note:

• Please configure kubectl command to interact with correct kubernetes cluster using kubernetes-context

• Get Current Context using below command

  • kubectl config get-contexts

Example Output:

$ kubectl config get-contexts
CURRENT   NAME                 CLUSTER                      AUTHINFO             NAMESPACE
*         docker-for-desktop   docker-for-desktop-cluster   docker-for-desktop

Automated deployment of helloworld-python app

Clone this repository and follow anyone of the methods for deployment as listed below

• To deploy helloworld-python application using public image from garoradevops dockerhub

  $ cd hello-world-k8s-python
  $ sh helloworld_kubernetes.sh -a
  

• To Build your own Image and Push to your own container repository and deploy helloworld-python application on kubernetes

  $ cd hello-world-k8s-python
  $ sh helloworld_kubernetes.sh -r "docker-repository-name" -i "image-name" -t "tag-name" -u "login-username" -p  -e
  
  Please Enter repository login password:
  
  Note: Enter here your docker repository login password
  

  If you are using container registry rather then dockerhub then you need to create secrets using below command
  
  kubectl create secret docker-registry regcred --docker-server=<registery name> --docker-username=<username> --docker-password=<password> --docker-email=<email-address> -n <namespace>
  
  And add this block in your deployment.yaml in helm chart.
  
  imagePullSecrets:
  - name: regcred
  

To cleanup helloworld-python application

$ sh cleanup_helloworld.sh

Manual deployment of helloworld-python application

First install Tiller (Helm Server)

$ kubectl create serviceaccount tiller -n kube-system
$ kubectl create clusterrolebinding tiller-cluster-rule --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
$ helm init --service-account tiller --upgrade

Install helloworld-python application using helm

$ kubectl create ns helloworld-python
$ cd hello-world-k8s-python
$ helm upgrade --install helloworld-python helloworld-python/ --namespace helloworld-python

Access helloworld-python on web browser

http://localhost:9090

Directory Structure

1. helloworld-pyhton: helm chart for helloworld-python application.
2. Dockerfile: Dockerfile to build your own image
3. hello_world.py: python hello world programme.
4. cleanup_helloworld.sh: script to delete helloworld-python helm chart and helloworld-python namespace from kubernetes.
5. helloworld_kubernetes.sh: Shell script for automate deployment of helloworld-python application.

Reference Links

• Docker
• HELM
• Kubernetes
• Python Flask