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If you use an IPMI BMC watchdog (by setting IPMI_WATCHDOG=yes in /etc/sysconfig/ipmi from OpenIPMI), the watchdog service doesn't actually work.  This is because systemd starts watchdog.service before ipmi.service, so /dev/watchdog doesn't exist yet when watchdog looks for it (so never opens it).

I'm not sure how to express it in systemd config terms, but ipmi.service needs to start (and finish startup) before watchdog.service.

This can be fixed by adding a weak dependency on ipmi.service to the watchdog.service by

Wants: ipmi.service
After: ipmi.service

Setting up new systems with IPMI watchdog for the first time in a while - this is still a problem.  It does seem that creating /etc/systemd/system/watchdog.service.d/ipmi.conf containing:

[Unit]
Wants=ipmi.service
After=ipmi.service

fixes the problem.

Commit: http://pkgs.devel.redhat.com/cgit/rpms/watchdog/commit/?id=97e22b780aa74263fb423eadde0fb232a0da64e8
Build: https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=712568

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3220