Hello again, I think I have resolved this issue by adding the following line to my relevant service startup files: RestartSec=60s I presume the line forces a restart within 60 seconds (or with the time allowance of 60 seconds). Actually according to this source: http://www.dsm.fordham.edu/cgi-bin/man-cgi.pl?topic=systemd.service&sect=5 it is the former - the sleep time before attempting a restart. I put the line directly below the "Restart=..." line. See my dnscache.service for example: [root at ns99 system]# more /usr/lib/systemd/system/dnscache.service [Unit] Description=An iterative DNS resolver daemon Documentation=man:dnscache(8) Requires=network.target After=network.target [Service] Restart=always RestartSec=60s PIDFile=/var/run/dnscache.pid ExecStart=/usr/sbin/dnscache [Install] WantedBy=multi-user.target [root at ns99 system]# Cheers, Boris. On Mon, Oct 27, 2014 at 2:26 PM, Boris Epstein <borepstein at gmail.com> wrote: > Hello listmates, > > Somehow or other my DNS services that are part of > the ndjbdns-1.06-1.el7.x86_64 package would not start properly at startup. > When I then start them up using systemctl: > > systemctl start dnscache > systemctl start tinydns > > they start just fine. > > From the log I got the following for tinydns: > > Oct 24 15:01:43 ns99 tinydns[1867]: tinydns: version 1.06: starting: > Oct-24 2014 15:01:43 EDT > Oct 24 15:01:43 ns99 tinydns[1867]: tinydns: DEBUG_LEVEL set to `1' > Oct 24 15:01:43 ns99 tinydns[1867]: tinydns: DATALIMIT set to `300000' > bytes > Oct 24 15:01:43 ns99 tinydns[1867]: tinydns: could not bind UDP socket > Oct 24 15:01:43 ns99 systemd[1]: tinydns.service holdoff time over, > scheduling restart. > > Any idea why that would happen? Any idea how to increase the holdoff time > in the configuration? > > The config for the service looks as follows: > > [root at ns99 etc]# more /usr/lib/systemd/system/tinydns.service > [Unit] > Description=A DNS server daemon > Documentation=man:tinydns(8) > Requires=network.target > After=network.target > > [Service] > Restart=always > PIDFile=/var/run/tinydns.pid > ExecStart=/usr/sbin/tinydns > > [Install] > WantedBy=multi-user.target > [root at ns99 etc]# > > I can't possibly spot anything wrong there. > > Any help much appreciated. > > Cheers, > > Boris. >