On Fri, Sep 16, 2016 at 4:02 PM, <aleksey.maksimov@it-kb.ru> wrote:
So, colleagues.
I again tested the Fencing and now I think that my host-server power-button (physically or through ILO) sends a KILL-command to the host OS (and as a result to VM)
This journald log in my guest OS when I press the power-button on the host:

...
Sep 16 16:19:27 KOM-AD01-PBX02 systemd[1]: Stopping ACPI event daemon...
Sep 16 16:19:27 KOM-AD01-PBX02 systemd[1]: Stopping User Manager for UID 1000...
Sep 16 16:19:27 KOM-AD01-PBX02 systemd[1]: Starting Unattended Upgrades Shutdown...
Sep 16 16:19:27 KOM-AD01-PBX02 snapd[2583]: 2016/09/16 16:19:27.289063 main.go:67: Exiting on terminated signal.
Sep 16 16:19:27 KOM-AD01-PBX02 sshd[2940]: pam_unix(sshd:session): session closed for user user
Sep 16 16:19:27 KOM-AD01-PBX02 su[3015]: pam_unix(su:session): session closed for user root
Sep 16 16:19:27 KOM-AD01-PBX02 spice-vdagentd[2638]: vdagentd quiting, returning status 0
Sep 16 16:19:27 KOM-AD01-PBX02 sudo[3014]: pam_unix(sudo:session): session closed for user root
Sep 16 16:19:27 KOM-AD01-PBX02 /usr/lib/snapd/snapd[2583]: main.go:67: Exiting on terminated signal.
Sep 16 16:19:27 KOM-AD01-PBX02 sshd[2812]: Received signal 15; terminating.
...
Sep 16 16:19:28 KOM-AD01-PBX02 systemd[1]: Reached target Unmount All Filesystems.
Sep 16 16:19:28 KOM-AD01-PBX02 systemd[1]: Stopped target Local File Systems (Pre).
Sep 16 16:19:28 KOM-AD01-PBX02 systemd[1]: Stopping Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling...
Sep 16 16:19:28 KOM-AD01-PBX02 systemd[1]: Stopped Remount Root and Kernel File Systems.
Sep 16 16:19:28 KOM-AD01-PBX02 systemd[1]: Stopped Create Static Device Nodes in /dev.
Sep 16 16:19:28 KOM-AD01-PBX02 systemd[1]: Reached target Shutdown.
Sep 16 16:19:28 KOM-AD01-PBX02 systemd[1]: Reached target Final Step.
Sep 16 16:19:28 KOM-AD01-PBX02 systemd[1]: Starting Reboot...
Sep 16 16:19:28 KOM-AD01-PBX02 systemd[1]: Stopped Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling.
Sep 16 16:19:28 KOM-AD01-PBX02 systemd[1]: Shutting down.
Sep 16 16:19:28 KOM-AD01-PBX02 kernel: [drm:qxl_enc_commit [qxl]] *ERROR* head number too large or missing monitors config: ffffc9000084a000, 0systemd-shutdown[1]: Sending SIGTERM to remaining processes...
Sep 16 16:19:28 KOM-AD01-PBX02 systemd-journald[3342]: Journal stopped
-- Reboot --

Perhaps this feature of HP ProLiant DL 360 G5. I dont know.

If I test the unavailability of a host other ways that everything is going well.

I described my experience testing Fencing on practical examples on my blog for everyone in Russian.
https://blog.it-kb.ru/2016/09/16/install-ovirt-4-0-part-4-about-ssh-soft-fencing-and-hard-fencing-over-hp-proliant-ilo2-power-managment-agent-and-test-of-high-availability/


Thank you all very much for your participation and support.

Michal, what kind of scenario are you talking about?

Basically what you just did,
the question is what happens when you run 'shutdown -h now' (or press the physical button if configured to trigger a soft shutdown); is it going to propagate somehow the shutdown action to the VMs or to brutally kill them?

In the first case the VMs will not restart regardless of their HA flags.
 


PS: Excuse me for my bad English :)


16.09.2016, 16:37, "Simone Tiraboschi" <stirabos@redhat.com>:
> On Fri, Sep 16, 2016 at 3:34 PM, Michal Skrivanek <michal.skrivanek@redhat.com> wrote:
>>> On 16 Sep 2016, at 15:31, aleksey.maksimov@it-kb.ru wrote:
>>>
>>> Hi Simone.
>>> Exactly.
>>> Now I'll put the journald on the guest and try to understand how the guest off.
>>
>> great. thanks
>>
>>> 16.09.2016, 16:25, "Simone Tiraboschi" <stirabos@redhat.com>:
>>>> On Fri, Sep 16, 2016 at 3:13 PM, Michal Skrivanek <michal.skrivanek@redhat.com> wrote:
>>>>>> On 16 Sep 2016, at 15:05, Gianluca Cecchi <gianluca.cecchi@gmail.com> wrote:
>>>>>>
>>>>>> On Fri, Sep 16, 2016 at 2:50 PM, Michal Skrivanek <michal.skrivanek@redhat.com> wrote:
>>>>>>> no, that’s not how HA works today. When you log into a guest and issue “shutdown” we do not restart the VM under your hands. We can argue how it should or may work, but this is the defined behavior since the dawn of oVirt.
>>>>>>>
>>>>>>>> ​AFAIK that's correct, we need to be able ​
>>>>>>>> ​shutdown HA VM​
>>>>>>>> ​
>>>>>>>> ​ without being it immediately restarted on different host. We want to restart HA VM only if host, where HA VM is running, is non-responsive.
>>>>>>>
>>>>>>> we try to restart it in all other cases other than user initiated shutdown, e.g. a QEMU process crash on an otherwise-healthy host
>>>>>> Hi, just another question in case HA is not configured at all.
>>>>>
>>>>> by “HA configured” I expect you’re referring to the “Highly Available” checkbox in Edit VM dialog.
>>>>>
>>>>>> If I run the "shutdown -h now" command on an host where some VMs are running, what is the expected behavior?
>>>>>> Clean VM shutdown (with or without timeout in case it doesn't complete?) or crash of their related QEMU processes?
>>>>>
>>>>> expectation is that you won’t do that. That’s why there is the Maintenance host state.
>>>>> But if you do that regardless, with VMs running, all the processes will be terminated in a regular system way, i.e. all QEMU processes get SIGTERM. From the perspective of each guest this is not a clean shutdown and it would just get killed
>>>>
>>>> Aleksey is reporting that he started a shutdown on his host by power management and the VM processes didn't get roughly killed but smoothly shut down and so they didn't restarted regardless of their HA flag and so this thread.
>>
>> Gianluca talks about “shutdown -h now”, you talk about power management action, those are two different things. The current idea is that systemd or some other component just propagates the action to the guest and if that guest is configured to handle it as a shutdown it starts it itself as well so it looks like a user-initiated one. Even though this mostly makes sense it is not ok for current HA logic
>
> Aleksey, can you please also test this scenario?
>>>>> Thanks,
>>>>> michal
>>>>>> Thanks,
>>>>>> Gianluca
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>>>>>
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