AH Hello Service

This service responds to

http://...:8080/greeting
http://...:8080/greeting?name={name}

Steps

The following steps desribe the process for building, deploying and exposing the service on GCP GKE with GCloud.

Compile the Java code

gradle build

Create the Docker image

docker build -t gcr.io/$DEVSHELL_PROJECT_ID/hello-service:0.0.1 .

Run the container locally

docker run -d -p 8080:8080 gcr.io/$DEVSHELL_PROJECT_ID/hello-service:0.0.1

Upload the image to the currently set project container registry

gcloud config set core/project aimless-hammer-development
gcloud auth configure-docker  # if not run before?
docker push gcr.io/$DEVSHELL_PROJECT_ID/hello-service:0.0.1

Create the cluster

gcloud container clusters create hello-cluster\
    --metadata=disable-legacy-endpoints=true\
    --machine-type=n1-standard-1\
    --issue-client-certificate\
    --zone=europe-west1-b\
    --enable-autoupgrade\
    --no-enable-ip-alias\
    --enable-basic-auth\
    --num-nodes=2

Create the pods

kubectl run hello-pod --image=gcr.io/$DEVSHELL_PROJECT_ID/hello-service:0.0.1 --port=8080 --replicas=2  # deprecated
kubectl get deployments
kubectl get nodes
kubectl get pods
# also useful
kubectl describe node <node-name>
kubectl describe pod <pod-name>

Expose the Service

kubectl expose deployment hello-pod --type=LoadBalancer --name=hello-lb  --port=8080 --target-port=8080
kubectl get services