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Kubernetes

Before using kubernetes we need to push these conatiners to DockerHub. Follow these steps in the next section to publish your images to DockerHub. Can skip as it has already been done.

Push To DockerHub

We need to publish our containers to DockerHub.

For that follow the following steps

Build the mongo db conatiner.

   cd mongo/
   docker build --file Dockerfile . -t mongo:latest

     cd nodejs/
     docker build --file Dockerfile . --build-arg STATE=DEVELOPMENT -t nodejsapp:development-latest

     docker build --file Dockerfile . --build-arg STATE=PRODUCTION -t nodejsapp:prod-latest

Now login into your DockerHub account using docker login

Now tag these images to your id. Replace pronoob007 with whatever is your id.

    docker tag nodejsapp:development-latest  pronoob007/nodejsapp:development-latest
    docker tag nodejsapp:prod-latest  pronoob007/nodejsapp:prod-latest
    docker tag mongo:latest  pronoob007/mongo:latest

Now we can push these images to DockerHub.

   docker push pronoob007/nodejsapp:prod-latest
   docker push pronoob007/nodejsapp:development-latest
   docker push pronoob007/mongo:latest

Use Kubernetes

Now we can install kubernetes make sure you had run the script ./install_docker_minikube.sh when you run the docker section. This script install minikube and kubectl.

We can deploy the kubernetes application in two ways.

  1. Simple Kubenetes
  2. Persistent Volume and Persistent Volume Claim.

Simple deployment

Make sure you have run the minikube cluster

 minikube start  --memory 12000  --cpus 2

Use cd simple

Then apply the following commands.

    kubectl apply -f mongo-deployment.yaml
    kubectl apply -f mongo-service.yaml
    kubectl apply -f node-deploy.yaml
    kubectl apply -f node-service.yaml

Now you can get the address for curl request using

minikube service nodejs-service --url

For example I got http://192.168.49.2:30707

 curl http://192.168.49.2:30707

Add some data

 curl --header "Content-Type: application/json"   --request POST   --data '{"name":"xyz","quantity":"1", "price": "20"}'   <address_you_get_above>/products

This shows out app is working as before.

$ curl http://192.168.49.2:30707/products
[{"_id":"655a6f85de87398cc510d2e0","name":"xyz","quantity":1,"price":20,"createdAt":"2023-11-19T20:26:45.763Z","updatedAt":"2023-11-19T20:26:45.763Z","__v":0}]

Persistent Volume and Persistent Volume Claim

cd pv_pvc and run the following to apply PVC and PVC claims.

kubectl apply -f mongodb-pv.yaml
kubectl apply -f mongo-db-pvc.yaml
kubectl apply -f mongo-pv-deploy.yaml

Now go to the earlier kubernetes directory cd simple assuming you are back in root directory of project.

Now run the following

kubectl apply -f mongo-service.yaml
kubectl apply -f node-deploy.yaml
kubectl apply -f node-service.yaml

To test this repeat the smae pro Repeat the same procedure you did with kubernetes to verify the app is running.