/kubernetis_demo

sample project for kubernetis

Demo app - developing with Docker

Tutorial from Youtube,

This demo app shows a simple user profile app set up using

Flow Diagram

Diagram

  • index.html with pure js and css styles
  • nodejs backend with express module
  • mongodb for data storage

Following docker image will be used

we will be using follwoing docker image

  • nanajanashia/k8s-demo-app:v1.0
  • mongo:latest
  • mongo-express:latest

We will have following parts

  • load configs
  • Load Secrets
  • Load Deployments

With Docker

To start the application

  • Load Configs

    
  apiVersion: v1
  kind: ConfigMap
  metadata:
    name: kube-config
  data:
    mongo-url: mongo-service
  
    • 

  • 

    Load Secrets
    
 
    
 apiVersion: v1
 kind: Secret
 metadata:
   name: kube-secret
 type: Opaque
 data:
   mongo-user: bW9uZ291c2Vy
   mongo-password: bW9uZ29wYXNzd29yZA==
 
    • 

  • 

    Load Deployment and Service
Refer
    

      

    • kube.yml
      • 

    • web.yml
      • 

    • mongoexpress.yml
      • 

    

    • 

  • 

    You can apply changes by
    

      

    • kubectl -f apply kube-config.yml
      • 

    • kubectl -f apply kube-secrets.yml
      • 

    • kubectl -f apply kube.yml
      • 

    • kubectl -f apply web.yml
      • 

    • kubectl -f apply mongoexpress.yml
      • 

    

    • 

  • 

    Access application using
    

      	{ip}:30100

    

    • 



K8s commands


start Minikube and check status


 minikube start --vm-driver=hyperkit 
 minikube status



get minikube node's ip address


 minikube ip



get basic info about k8s components


 kubectl get node
 kubectl get pod
 kubectl get svc
 kubectl get all



get extended info about components


 kubectl get pod -o wide
 kubectl get node -o wide



get detailed info about a specific component


 kubectl describe svc {svc-name}
 kubectl describe pod {pod-name}



get application logs


 kubectl logs {pod-name}



stop your Minikube cluster


 minikube stop




> ⚠️ **Known issue - Minikube IP not accessible** 
If you can't access the NodePort service webapp with `MinikubeIP:NodePort`, execute the following command:

minikube service webapp-service



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