How to Access the Application after the kubernetes deployment - jenkins

Question

I'm new to kubernetes tool, i'm trying to deploy the Angular application using docker + kubernetes, here the below Jenkins script.
stage('Deploy') {
container('kubectl') {
withCredentials([kubeconfigFile(credentialsId: 'KUBERNETES_CLUSTER_CONFIG', variable: 'KUBECONFIG')]) {
def kubectl
kubectl = "kubectl --kubeconfig=${KUBECONFIG} --context=demo"
echo 'deployment to PRERELEASE!'
sh "kubectl config get-contexts"
sh "kubectl -n demo get pods"
sh "${kubectl} apply -f ./environment/pre-release -n=pre-release"
}
}
}
}
Please find the below jenkins outputs
/home/jenkins/agent/workspace/DevOps-CI_future-master-fix
[Pipeline] stage
[Pipeline] { (Deploy)
[Pipeline] container
[Pipeline] {
[Pipeline] withCredentials
Masking supported pattern matches of $KUBECONFIG
[Pipeline] {
[Pipeline] echo
deploy to deployment!!
[Pipeline] echo
deploy to PRERELEASE!
[Pipeline] sh
+ kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
* demo kubernetes kubernetes-admin demo
kubernetes-admin#kubernetes kubernetes kubernetes-admin
[Pipeline] sh
+ kubectl -n demo get pods
NAME READY STATUS RESTARTS AGE
worker-f99adee3-dedd-46ca-bc0d-6b24391e5865-qkd47-mwl3v 5/5 Running 0 26s
[Pipeline] sh
+ kubectl '--kubeconfig=****' '--context=demo' apply -f ./environment/pre-release '-n=pre-release'
deployment.apps/frontend-deploy unchanged
service/frontend unchanged
[Pipeline] }
[Pipeline] // withCredentials
[Pipeline] }
[Pipeline] // container
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // node
[Pipeline] }
[Pipeline] // podTemplate
[Pipeline] End of Pipeline
Finished: SUCCESS
Now the questions is after the deployment i am not able to see the pods and deployment in both machine master machine using below command, can you please some one help me how to access the application after the successful deployment .
kubectl get pods
kubectl get services
kubectl get deployments

Answer 1

You're setting the namespace to pre-release when running "${kubectl} apply -f ./environment/pre-release -n=pre-release".
To get pods in this namespace, use: kubectl get pods -n pre-release.
Namespaces are a way to separate different virtual clusters inside your single physical Kubernetes cluster. See https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/ for more detail.

Answer 2

You are creating the resources in a namespace called pre-release using -n option when you run the following command.
kubectl '--kubeconfig=****' '--context=demo' apply -f ./environment/pre-release '-n=pre-release'
deployment.apps/frontend-deploy unchanged
You need to to list the resources in the same namespace.
kubectl get pods -n pre-release
kubectl get services -n pre-release
kubectl get deployments -n pre-release
By default kubectl will do the requested operation in default namespace. If you want to set your current namespace to pre-release so that you need not append -n pre-release with every kubectl command, you can run the following command:
kubectl config set-context --current --namespace=pre-release