Once the Kubernetes cluster is created, what next?

How to deploy applications on the cluster and test that?

• Make sure minikube is installed on system

  • minikube version

• Start the minikube

  • ensure hyperkit is installed

  • minikube start --memory=4098 --driver=hyperkit

• To communicate with Kubernetes cluster(Minikube) - we would need kubectl

  • check if kubectl is installed kubectl version

• Once the minikube is started, know the information about the cluster

  • kubectl cluster-info

  • kubectl config view

• In the cluster, we will have one or many nodes, to know about that.

  • kubectl get nodes

  • Get the STATUS of node as Ready or NotReady

• What is inside the nodes - Deployment & pods, Check that

  • kubectl get deployment

  • kubectl get pods

  • If it says nothing found on DEFAULT namespace, that means we need to create them

  • Get the resource on other namespaces

    • kubectl get deployment --all-namespaces

    • kubectl get pods -A === kubectl get pods --all-namespaces

    • This would provide some system resource deployments on different namespaces

• To communicate with the nodes or pods, we would need to have services

  • Check the services kubectl get services 0r kubectl get svc

    • Note: There may be one defaultkubernetes service

• Now, write the Kubernetes manifest files

  • There are two ways we can create the deployment

    Automatically using kubectl create command

    • use kubectl create command to create that automatically

    • I suggest to create that using create command first to get some confidence of application deployment.

    • Once get practice, we can write that manually

    • kubectl create deployment express-deployment --image=daspratha/express:v1

OR

Manually - create a file Deployment.yaml & write all the configurations manually - We will check that on next article

• Service

  • To expose the pods to node network. [we cant test load balancer using minikube on local system, for that we have to use cloud server]

  • Create the service using kubectl expose command

  • Know the deployment name - kubectl get deployment

  • expose the deployment with nodePort type

    kubectl expose deployment express-deployment --type=NodePort --port=3000

  • check the service - kubectl get svc

  • Note : We dont need the source code & Dockerfile on the folder from where we are running all the kubectl commands.

  • Once the service is deployed, check its URL to access the pod

  • Know the service name - kubectl get svc

  • minikube service express-deployment --url #http://192.168.64.2:31683

Now, go to browser and you will see the application from this URL http://192.168.64.2:31683

Once the deployment & service are created, to delete them

• Deployment - kubectl delete deployment express-deployment

• Service - kubectl delete services express-deployment

If these articles are giving any value, please give a shoutout.