Operators combine observability and change control. journalctl -u unit -b tails service logs since boot; --since narrows incidents. Package managers differ—apt, dnf, zypper—but rpm -qa and dpkg -l list inventory. User lifecycle uses useradd, passwd, chage. Always snapshot configs before edits and verify services with systemctl status.
| Task | Commands | Why it matters |
|---|---|---|
| Logs | journalctl -xe | Structured systemd logs |
| Packages | dnf repoquery -l pkg | Know files before removal |
| Time | timedatectl status | TLS and logs need correct clocks |