Health Check
Ref.: https://learn.microsoft.com/en-us/azure/container-apps/health-probes?tabs=yaml
Probes
- Startup: Checks if your application has successfully started. This check is separate from the liveness probe and executes during the initial startup phase of your application.
- Liveness: Checks if your application is still running and responsive.
- Readiness: Checks to see if a replica is ready to handle incoming requests.
Example Liveness Endpoint
const express = require('express');
const app = express();
app.get('/liveness', (req, res) => {
let isSystemStable = false;
// check for database availability
// check filesystem structure
// etc.
// set isSystemStable to true if all checks pass
if (isSystemStable) {
res.status(200); // Success
} else {
res.status(503); // Service unavailable
}
})