Unable to deploy docker image to GKE using Jenkins - jenkins-pipeline

Question

I'm running the Jenkins jenkinsci/blueocean docker image on a Mac and am trying to build and deploy an image to a Kubernetes cluster on GCP using a Jenkins pipeline (GKE plugin v0.8.3) but it fails --the image is built and added to the container registry (DockerHub) successfully but the deployment to GKE fails at the "Deploy to K8s" stage below .Jenkins does not display any error message. What am I doing wrong? Any help is much appreciated
My deployment.yaml file
apiVersion: apps/v1
kind: Deployment
metadata:
name: mywebtestApp-deployment
labels:
app: mywebtestApp
spec:
replicas: 3
selector:
matchLabels:
app: mywebtestApp
template:
metadata:
labels:
app: mywebtestApp
spec:
containers:
- name: mywebtestApp
image: <mydockerhub>/<myimagename>:latest
ports:
- containerPort: 80
and my Jenkins file
pipeline {
agent any
environment {
............
stage('Deploy to K8s') {
steps{
echo 'Deployment started ...'
step([$class: 'KubernetesEngineBuilder', projectId: env.PROJECT_ID, clusterName: env.CLUSTER_NAME, location: env.LOCATION, manifestPattern: 'deployment.yaml', credentialsId: env.CREDENTIALS_ID, verifyDeployments: true])
echo "Deployment Finished ..."
}
}
}
}

Answer 1

If you will apply this Deployment on your cluster you will get error:
The Deployment "mywebtestApp-deployment" is invalid:
* metadata.name: Invalid value: "mywebtestApp-deployment": a DNS-1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')
* spec.template.spec.containers[0].name: Invalid value: "mywebtestApp": a DNS-1123 label must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name', or '123-abc', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?')
You cannot use capital letters.
You have to change your labels from app: mywebtestApp to app: mywebtestapp and deployment name from name: mywebtestApp-deployment to name: mywebtestApp-deployment
After that changes you will be able to create deployment.
$ kubectl apply -f deployment.yaml
deployment.apps/mywebtestapp-deployment created