====== Systemd ======
===== Timer =====
https://wiki.archlinux.org/index.php/Systemd/Timers
<code>
\cat /etc/systemd/system/certbot.service
[Unit]
Description=Renewal certificates

[Service]
Type=oneshot
ExecStart=/usr/bin/certbot renew
</code>

<code>
\cat /etc/systemd/system/certbot.unit
[Unit]
Description=Automatic renewal certificates

[Timer]
OnCalendar=daily 00:00:00
Persistent=true
 
[Install]
WantedBy=timers.target
</code>

<code>
sudo systemctl enable certbot.timer
</code>