Trace a 502 error from Nginx to the application or PHP-FPM, check sockets and resource pressure, and verify a fix without blindly restarting services.

Find what is consuming disk space, diagnose inode exhaustion and deleted files, and control journal growth without blindly deleting application data.

Build a practical PostgreSQL backup drill: create a protected archive, restore into a separate database, and validate the data your application needs.

A focused checklist for access, updates, backups, and monitoring before your application welcomes its first visitors.