<html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> </head> <body bgcolor="#FFFFFF" text="#000000"> Hello! Have a .timer service like: ====== [Unit] Description=Runs VBA32 Update Hourly Requires=timers.target [Timer] OnBootSec=2min OnUnitInactiveSec=1h [Install] WantedBy=timers.target ====== to run vba32update.service in 1 hour after previous update-session is over (OnUnitInactiveSec=1h). From man-page: "<code class="varname">OnUnitInactiveSec=</code> defines a timer relative to when the unit the timer is activating was last deactivated." Ok, here is log-snippet: ====== Июл 08 22:05:00 linux-mk500 systemd[1]: Starting VBA32 Anti-Virus Update Service... Июл 08 22:05:00 linux-mk500 vbacl[14768]: Vba32 console scanner update process started Июл 08 22:05:00 linux-mk500 vbacl[14768]: Reading configuration options from ./vbacl.ini Июл 08 22:05:00 linux-mk500 vbacl[14768]: Using direct connection for update Июл 08 22:05:02 linux-mk500 vbacl[14768]: Current dir is ./ Июл 08 22:05:02 linux-mk500 vbacl[14768]: Start update from <a class="moz-txt-link-freetext" href="http://anti-virus.by/update">http://anti-virus.by/update</a> Июл 08 22:05:02 linux-mk500 vbacl[14768]: Receiving file list Июл 08 22:05:02 linux-mk500 vbacl[14768]: File list received Июл 08 22:05:02 linux-mk500 vbacl[14768]: Update is not needed Июл 08 22:05:02 linux-mk500 systemd[1]: Started VBA32 Anti-Virus Update Service. Июл 08 23:05:13 linux-mk500 systemd[1]: Starting VBA32 Anti-Virus Update Service... Июл 08 23:05:13 linux-mk500 vbacl[15289]: Vba32 console scanner update process started Июл 08 23:05:13 linux-mk500 vbacl[15289]: Reading configuration options from ./vbacl.ini Июл 08 23:05:13 linux-mk500 vbacl[15289]: Using direct connection for update Июл 08 23:05:17 linux-mk500 vbacl[15289]: Current dir is ./ Июл 08 23:05:17 linux-mk500 vbacl[15289]: Start update from <a class="moz-txt-link-freetext" href="http://anti-virus.by/update">http://anti-virus.by/update</a> Июл 08 23:05:17 linux-mk500 vbacl[15289]: Receiving file list Июл 08 23:05:17 linux-mk500 vbacl[15289]: File list received Июл 08 23:05:17 linux-mk500 vbacl[15289]: Update is not needed Июл 08 23:05:17 linux-mk500 systemd[1]: Started VBA32 Anti-Virus Update Service. Июл 09 00:05:20 linux-mk500 systemd[1]: Starting VBA32 Anti-Virus Update Service... Июл 09 00:05:20 linux-mk500 vbacl[16050]: Vba32 console scanner update process started Июл 09 00:05:20 linux-mk500 vbacl[16050]: Reading configuration options from ./vbacl.ini Июл 09 00:05:20 linux-mk500 vbacl[16050]: Using direct connection for update Июл 09 00:05:24 linux-mk500 vbacl[16050]: Current dir is ./ Июл 09 00:05:24 linux-mk500 vbacl[16050]: Start update from <a class="moz-txt-link-freetext" href="http://anti-virus.by/update">http://anti-virus.by/update</a> Июл 09 00:05:24 linux-mk500 vbacl[16050]: Receiving file list Июл 09 00:05:24 linux-mk500 vbacl[16050]: File list received Июл 09 00:05:24 linux-mk500 vbacl[16050]: Update is not needed Июл 09 00:05:24 linux-mk500 systemd[1]: Started VBA32 Anti-Virus Update Service. Июл 09 01:05:50 linux-mk500 systemd[1]: Starting VBA32 Anti-Virus Update Service... Июл 09 01:05:50 linux-mk500 vbacl[16528]: Vba32 console scanner update process started Июл 09 01:05:50 linux-mk500 vbacl[16528]: Reading configuration options from ./vbacl.ini Июл 09 01:05:50 linux-mk500 vbacl[16528]: Using direct connection for update Июл 09 01:05:55 linux-mk500 vbacl[16528]: Current dir is ./ Июл 09 01:05:55 linux-mk500 vbacl[16528]: Start update from <a class="moz-txt-link-freetext" href="http://anti-virus.by/update">http://anti-virus.by/update</a> Июл 09 01:05:55 linux-mk500 vbacl[16528]: Receiving file list Июл 09 01:05:55 linux-mk500 vbacl[16528]: File list received Июл 09 01:05:55 linux-mk500 vbacl[16528]: Update is not needed Июл 09 01:05:55 linux-mk500 systemd[1]: Started VBA32 Anti-Virus Update Service. ====== We see 22:05:02 (end of update-session) --> 23:05:13 (start of next update-session) --> 23:05:17 (end of update-session) --> 00:05:20 (start of next update-session) --> 00:05:24 (end of update-session) --> 01:05:50 (start of next update-session) --> 01:05:55 (end of update-session). Question: Why time of new update-session is *not* equal to time of end of previous update-session + 1h in section of seconds, e.g. 23:05:17 +1h = 00:05:17; 00:05:24 + 1h = 01:05:24 and so on? Is here a way to reach this precise coincidence? Thanks! Platform: x64, openSUSE Leap 42.1, systemd 210. </body> </html>