[ClusterLabs] Which fence agent is needed for an Apache web server cluster?

[Reid Wahl]

On Sat, Mar 27, 2021 at 10:23 PM Andrei Borzenkov <arvidjaar at gmail.com>
wrote:

> On 28.03.2021 02:42, Reid Wahl wrote:
> > On Sat, Mar 27, 2021 at 4:28 PM Strahil Nikolov <hunter86_bg at yahoo.com>
> > wrote:
> >
> >> I had to tune the fence_ipmi recently on some older HPE blades. The
> >> default settings were working, but also returning some output about
> >> problems negotiating the cypher.
> >> As that output could make future version of the fence agent go wild, I
> >> tested several options untill no errors are reported. Maybe the cypher
> flag
> >> was different, but I think it was '-c'. If I'm wrong , the author of
> this
> >> thread can check the man page .
> >>
>
> For the sake of archives - this is upper case 'C', not lower case, right?
>

Yes, thanks

>> Yes -> 'HandlePowerKey=ignore' . I have never expected ipmi to try
> >> graceful shutdown when I tell it to 'press and hold' or 'cold boot',
> yet I
> >> never checked the code of fence_ipmi.
> >>
> >
> > fence_ipmilan uses ipmitool to send a poweroff signal. The iLO then
> sends a
> > virtual power button press, which IIRC goes through ACPI. By default on
> > RHEL 7 and above, if the system is responsive, systemd-logind handles a
> > power key press by initiating a graceful shutdown. You have to disable it
> > from handling the power key press so if you want hard-power-off behavior.
> >
>
> This is really a bug in iLO then. "ipmitool power off" is expected to
> initiate hard power off; soft power off goes via "ipmitoo power soft".
>

Either that, or I'm wrong about how it's implemented :) Regardless, somehow
systemd-login is able to handle (intercept) the button press.


> Although I have seen with other vendor that "ipmitool power off" *also*
> sent signal to OS and OS started shutdown which was then interrupted by
> hard power off. Superficially (if you do not pay attention to console)
> it looked like normal shutdown.
>
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-- 
Regards,

Reid Wahl, RHCA
Senior Software Maintenance Engineer, Red Hat
CEE - Platform Support Delivery - ClusterHA
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