Lab Overview

Resources

• The source code for this app is available here: https://github.com/openshift-cs/ostoy
• OSToy front-end container image: https://quay.io/ostoylab/ostoy-frontend
• OSToy microservice container image: https://quay.io/ostoylab/ostoy-microservice
• Deployment Definition YAMLs:
  • ostoy-fe-deployment.yaml
  • ostoy-microservice-deployment.yaml

Note In order to simplify the deployment of the app we have included all the objects needed in the above YAMLs as "all-in-one" YAMLs. Though in reality, an enterprise would most likely want to have a different yaml file for each Kubernetes object.

About OSToy

OSToy is a simple Node.js application that we will deploy to OpenShift Dedicated. It is used to help us explore the functionality of Kubernetes. This application has a user interface where you can:

• write messages to the log (stdout / stderr)
• intentionally crash the application to view self-healing
• toggle a liveness probe and monitor OpenShift behavior
• read config maps, secrets, and env variables
• if connected to shared storage, read and write files
• check network connectivity, intra-cluster DNS, and intra-communication with an included microservice
• increase the load to view automatic scaling of the pods to handle the load (via the Horizontal Pod Autoscaler)

OSToy Application Diagram

Familiarization with the Application UI

1. Shows the pod name that served your browser the page.
2. Home: The main page of the application where you can perform some of the functions listed which we will explore.
3. Persistent Storage: Allows us to write data to the persistent volume bound to this application.
4. Config Maps: Shows the contents of configmaps available to the application and the key:value pairs.
5. Secrets: Shows the contents of secrets available to the application and the key:value pairs.
6. ENV Variables: Shows the environment variables available to the application.
7. Networking: Tools to illustrate networking within the application.
8. Auto Scaling: Tool to increase the load of the pods and test the HPA.
9. Shows some more information about the application.

Learn more about the application

To learn more, click on the "About" menu item on the left once we deploy the app.