1 - ConfigMap -> MongoDB Endpoint
2 - Secret -> MongoDB User & Pwd
3 - Deployment & Service -> MongoDB application with *internal* service
4 - Deployment & Service -> WebApp with *external* Service
Request (port: 27017) -> MongoService (targetPort: 27017) -> Pod (containerPod: 27017)kubectl get pod # to list what we have
# First need to deploy the configuration service
kubectl apply -f mongo-configmap.yaml
kubectl apply -f mongo-secret.yaml
# Deploy DB
kubectl apply -f mongo.yaml
# New needs to show: deployment created and service created
# Deploy webapp
kubectl apply -f webapp.yaml
# Show all the components created in the cluster
kubectl get all
kubectl get configmap
kubectl get secret
kubectl describe service webapp-service
# Get status of the POD
kubectl describe pod NAME_OF_THE_POD
kubectl logs NAME_OF_THE_POD_OR_DEPLOYMENT
kubectl logs NAME_OF_THE_POD_OR_DEPLOYMENT -f # to stream the log
kubectl logs NAME_OF_THE_POD_OR_DEPLOYMENT -n NAMESPACE_NAME # optionally if namespace isnot default
# Accessing WebApp from the browser
# Check the services
kubectl get svc
# NodePort is accessible on each Workers Node's IP address
# We only have 1 machine and using minikube, so we get the minikube ip
minikube ip
# or...
kubectl get node -o wide # show more columns including ip
# To access on browser we need to inform the minikube IP + NodePort we informed to the webapp service.
# Example:
kubectl get services webapp-service -o wide
# will show this:
# NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
# webapp-service NodePort 10.104.180.246 <none> 3003:30100/TCP 42s app=webapp-pod
# The NodePort we configured is the 30100
# IF SOMETHING WENT WRONG:
kubectl get pods # check if "Status" is Pending
# If pending status check "Events" of the describe result:
kubectl describe pod POD_NAME_OF_THE_SERVICE
# or...
kubectl get events
If you can't access the NodePort service webapp with MinikubeIP:NodePort, execute the following command:
minikube service webapp-service