/etc/systemd/system/startPeriodicCheck.service

[Unit]
Description=startPeriodicCheck
 
[Service]
#ExecStartPre=/bin/sleep 30
ExecStart=/bin/curl 127.1/WebCoding/services/PeriodicCheck.php
KillMode=process
Restart=always
RestartSec=10s
 
[Install]
WantedBy=multi-user.target

systemctl daemon-reload
systemctl start startPeriodicCheck
systemctl enable startPeriodicCheck

Dans notre exemple une crontab aurait très bien pu faire l'affaire.

Ou encore :

/etc/systemd/system/plop.service

[Unit]
Description=Plop
After=getty.target
 
[Service]
User=user1
Group=user1
# Default : Type=simple
Type=simple
ExecStart=/home/user1/bin/plop
Restart=always
 
[Install]
WantedBy=multi-user.target