After upgrading to Jessie, watchdog doesn't start at boot anymore. Starting it manually using "sudo service watchdog start" does work. I tried:
I checked
What else can I try?
Over at Unix & Linux Ineb answered:
Open
/lib/systemd/system/watchdog.service and add [Install] WantedBy=multi-user.targetSystemd needs the [Install]-Section for a Unit to know how it should enable/disable the Unit.
After that calling systemctl enable watchdog worked.
[Install] section is there, but service doesn't start automatically. What to do?
systemctl enable watchdog should do this. Is there any output when you try to enable the service?
Commented
Dec 16, 2017 at 12:31
sudo systemctl enable watchdog Synchronizing state for watchdog.service with sysvinit using update-rc.d... Executing /usr/sbin/update-rc.d watchdog defaults Executing /usr/sbin/update-rc.d watchdog enable. And /etc/init.d/watchdog status shows active (running) when started manually. Then I make reboot and ... Oh gosh! It is active! Thank you, but I don't know why it worked this time.
update-rc.dcommand you used, what your default runlevel is (runlevelwill tell you), and then what priorityupdate-rc.dassigned in the init directory for that service (those are/etc/rcN.d, whereNis the runlevel; the priority is the number prefixed to the service file link). You might also want to trysystemctl list-units | grep -i watchdogto see if you can use systemd directly for this instead.sudo update-rc.d watchdog defaultsandsudo update-rc.d watchdog enable. The output ofsystemctlis empty.update-rc.ddid work because/etc/rc5.d/S05watchdogexists (that's allupdate-rc.ddoes, so that is not the problem, presuming that is the name of the link you found).