nodejs-colorizedapp - a simple application in nodejs to try Kubernetes, Kustomize, Istio, ArgoCD, Keycloak and Github Actions.
The purpose of this app was to test the following technologies:
- Github Actions and compare it to Jenkins in relation to continuous integration/continuous delivery process
- Istio
- ArgoCD (and again - compare it to Jenkins) in relation to continuous delivery process
- Keycloak for testing SSO via Entra ID (formerly Azure AD)
- Kustomize as a lightweight replacement for Helm Charts
The application is very simple - it shows a main page that can be parametrised and it has livenes and readiness probes.
- Application: Node.js and Express
- Pipelines: Github Actions
Code was tested on following platforms:
- npm 10.9.2
- Node.js 22.13.1 (LTS)
- Kubernetes 1.30.6
Used libraries:
- available in package.json
- Clone git repo to localhost.
- Install required packages.
npm ci - To start application, perform:
node src/app.js
After start, you can access app using following URL in your browser:
http://127.0.0.1:3000/
- For infra setup see following file README.md
- For minimal setup for cluster components see following file README.md
- Minmal setup requires cert-manager, ingress-nginx and istio
- If you want to create more complex setup with additional instances of Keycloak connected to Entra ID and ArgoCD, see following files:
Application: Index available at: http://127.0.0.1:3000/
Application can be parametrized via environment variables:
- MESSAGE (string): message that will be present on main page
- BG_COLOR (string): background color in main page defined in HEX format (#COLOR1)
- FONT_COLOR (string): text color in main page color defined in HEX format (#COLOR2)
- FORCE_SET_NOT_READY (bool): force app to never become healthy
Example:
MESSAGE="Custom Message" BG_COLOR="#ffcc00" FONT_COLOR="#990000" FORCE_SET_NOT_READY="false" node src/app.js