/lib/systemd/system/certbot.service

/lib/systemd/system/certbot.service

[Unit]
Description=Certbot
Documentation=file:///usr/share/doc/python-certbot-doc/html/index.html
Documentation=https://letsencrypt.readthedocs.io/en/latest/
[Service]
Type=oneshot
ExecStart=/usr/bin/certbot -q renew
PrivateTmp=true

/lib/systemd/system/certbot.timer

See also

• Systemd: systemctl, systemd-journald, journalctl systemd-cat, systemd-logind, systemd-networkd:networkctl, systemd-timesyncd, systemd-resolved, systemd-udevd , Systemd-logind: loginctl, hostnamectl, udevadm, systemd-run, portablectl, systemd-nspawn, systemd resource management, Timer (systemd), systemd logs, /etc/systemd/, systemd services, systemd-mount, /run/systemd/, .service, /usr/lib/systemd/, /usr/lib/systemd/system/, /usr/lib/systemd/system/systemd-resolved.service, /lib/systemd/, machinectl, systemd-oomd, systemd-analyze
• Certbot, Let's Encrypt: certbot (command), plugins, OCSP, certbot certificates, certbot renew (examples), /var/log/letsencrypt/letsencrypt.log, Certificate Checker, Certbot changelog, certbot --help, /etc/letsencrypt/

https://wiki.ubuntu.com/DebuggingSystemd