Exercise 1: Deploy microservices to Kubernetes

In this exercise we will run the application in your Kubernetes cluster using precompiled container images for our sample application: articles-secure, web-api-secure, and web-app. These container images have been uploaded to Docker Hub.

When running locally, you will set the Keycloak URL as OpenID Connect (OIDC) provider in application.properties. When running on a Kubernetes cluster we cannot set the OIDC provider (keycloak) in application.properties without recompiling the code, building a new image, and loading this image in a Image repository that is accessible to your Kubernetes cluster. So for this example, we specify the Quarkus OIDC property as environment variable during deployment. The environment variable is read from a config map.

STEP 1: Apply configmap

This is our configmap definition:

kind: ConfigMap
apiVersion: v1
metadata:
  name: security-url-config
data:
  QUARKUS_OIDC_AUTH_SERVER_URL: "http://keycloak:8080/auth/realms/quarkus"

Our Keycloak service runs in the same namespace as the rest of the application, so all we need is the name of the service (keycloak) and the port numer (8080).

• Apply the configmap.yaml

cd $ROOT_FOLDER/IKS
kubectl apply -f configmap.yaml

STEP 2: Now deploy the 3 services

• Deploy Articles Microservice

cd $ROOT_FOLDER/articles-secure/deployment
kubectl apply -f articles.yaml

• Deploy Web-API Microservice

cd $ROOT_FOLDER/web-api-secure/deployment
kubectl apply -f web-api.yaml

• Deploy Web-App Vue.js frontend application

cd $ROOT_FOLDER/web-app/deployment
kubectl apply -f web-app.yaml

• Verify all pods are running

kubectl get pods

Example output:

NAME                        READY   STATUS                       RESTARTS   AGE
articles-5df77c46b4-v7xcd   2/2     Running                0          3h35m
keycloak-77cffb978-vjttk    2/2     Running                      0          44h
web-api-5c9698b875-kz82k    2/2     Running                 0          3h35m
web-app-659c4676d9-pw6f8    2/2     Running                      0          3h34m

STEP 3: Adjust the redirect, admin, web origins URLs in Keycloak

• Try to open the Cloud-Native-Starter application in a browser. Use the $INGRESSURL of your cluster, which is the URL to the frontend application Web_APP you deployed before.

echo https://$INGRESSURL

• You will see we need to configure the redirect in Keycloak

• Open Keycloak in a browser and login to Keycloak with user: admin and password: admin. Get the right URL by display the URL with the following terminal command.

 echo https://$INGRESSURL/auth/admin/master/console/#/realms/quarkus

• Select Clients and then frontend in Keycloak.

• Ajust the client frontend URIs https://YOUR-URL:auth with valid redirect URI you get with the command:

 echo https://$INGRESSURL

Replace the entries with your value.

STEP 4: Open the Cloud Native Starter application in your browser

• Use following URL:

 echo https://$INGRESSURL

• Login in with user: alice and password: alice

• Now you see the entries of the articles

Note: The image shows you in Kiali the running applications. These are the simplified steps you see in the image. This is not a part of your hands-on tasks.

• 1: The web-app will be requested buy our URL to be loaded in a webbrowser.

• 2: The web-app in the webbrowser does connect to Keycloak for Authentication.

• 2: The web-app in the webbrowser does connect to the web-api to get the Articles information.

• 4: The web-api in does validated the authorization with Keyloak.

• 5: The web-api in the webbrowser does connect to the articles to get the Articles information.

• 6: The articles in does validated the authorization with Keyloak.