[ClusterLabs] Softdog challenges on Ubuntu

[Ross Sponholtz]

Hi Folks,
I’ve been setting up clusters on RHEL and SLES in Azure just fine for quite a while, but I’ve recently been asked to do the same thing on Ubuntu.  Everything has gone fine, but my one challenge is that I can’t get the softdog watchdog driver to load at boot time.  In Azure we need to use softdog because there is no hardware watchdog available at this time.

In trying to get this to work, I’ve put “softdog” in the proper files (I’ve tried /etc/modules, /etc/modules-load.d/modules.conf and /etc/modules-load.d/softdog.conf).
I’m getting this error in the syslog:

systemd-modules-load[175]: Module 'softdog' is deny-listed (by kmod)

However, I can load the softdog module just fine after the machine boots up using modprobe.

I’ve checked the normal places for a blacklist entry (eg. /etc/modprobe.d) and there isn’t a single reference to softdog.  I’ve literally searched the whole machine for any reference to softdog (eg. find / | xargs grep softdog > /tmp/softdog.lst) and all I got was lines from the log files.  Also, there is no other watchdog kernel module loaded that I can tell, and before I load the softdog module there is no /dev/watchdog device.

Other than this my cluster seems to work just fine.

Any suggestions on how to fix this?

BTW, there was some conversation about this on the list back in June of 2022, but there was never a mention of how to load this module automatically.

Thanks,
Ross Sponholtz
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