Using systemd units instead of cron - DavidDengHui/acme.sh GitHub Wiki

1. Create a systemd unit for acme.sh:

/etc/systemd/system/acme_letsencrypt.service

[Unit]
Description=Renew Let's Encrypt certificates using acme.sh
After=network-online.target

[Service]
Type=oneshot
# --home's argument should be where the acme.sh script resides.
ExecStart=/path/to/acme.sh --cron --home /path/to/acme.sh

SuccessExitStatus=0 2

2. Test that it works before creating the timer:

sudo systemctl daemon-reload
sudo systemctl start acme_letsencrypt

3. Create systemd timer unit for the service above:

/etc/systemd/system/acme_letsencrypt.timer

[Unit]
Description=Daily renewal of Let's Encrypt's certificates

[Timer]
OnCalendar=daily
RandomizedDelaySec=1h
Persistent=true

[Install]
WantedBy=timers.target

4. Enable timer:

sudo systemctl start acme_letsencrypt.timer
sudo systemctl enable acme_letsencrypt.timer