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Lab Overview

Resources#

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 ROSA. 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#

OSTOY Architecture

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.

Home Page

Learn more about the application#

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

ostoy About