test.timer

# cat /etc/systemd/system/test.timer
[Timer]
OnCalendar=
OnCalendar=*-*-* *:*:00
RandomizedDelaySec=0

Unit=test.target

[Install]
Also=test.target



# cat /etc/systemd/system/test.target
[Unit]
Description=Test target
StopWhenUnneeded=true
[email protected] [email protected]
[email protected] [email protected]

[Install]
[email protected] [email protected]



# cat /etc/systemd/system/[email protected]
[Service]
Type=oneshot
ExecStart=/bin/sh -c 'v="$(shuf -i 4-15 -n1)"; echo Running service %i in $v seconds at $(date) >> /root/1.tmp; sleep $v'
[Install]
#WantedBy=test.target
#RequiredBy=test.target