Linux Server Administration (Ubuntu / Debian) New Server Setup Script Save as on the new machine, run once as root, then delete it. --- sysctl.d Production Tuning Reference The file above ( ) covers the most impactful parameters. Apply changes live without rebooting: --- /etc/security/limits.conf — High-Concurrency App For systemd services, in the unit file takes precedence over . Set both. Verify effective limits of a running process: --- Package Management --- File Permissions --- logrotate — Application Log Config Create : --- journald Retention Limits --- User Management --- cron Scheduli…