Linux, Nginx and Cloud: deploying an observable application

Deployment goes beyond starting a process

An app answering on a local port is not yet a reliable service. On a Linux server, distinguish the application process, reverse proxy, domain, TLS certificate and database. Nginx can accept public requests and forward them to the application; every layer should have a configuration the team can understand.

Checks that matter

• Expose only the necessary network ports.
• Serve public traffic over HTTPS and plan certificate renewal.
• Check environment variables and file permissions.
• Collect useful logs without recording secrets.
• Back up data and test restoration.
• Add a health check and watch errors, latency and saturation.

Document the rollback path: which version was running, how to return to it and which migrations make a rollback difficult. The goal is to diagnose incidents without improvising under pressure.