[ovirt-users] oVirt 4.0.3 (Hosted Engine) - High Availability VM not restart after auto-fencing of host.

[Simone Tiraboschi]

On Fri, Sep 16, 2016 at 3:34 PM, Michal Skrivanek <
michal.skrivanek at redhat.com> wrote:

>
> On 16 Sep 2016, at 15:31, aleksey.maksimov at 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 at redhat.com>:
>
>
>
> On Fri, Sep 16, 2016 at 3:13 PM, Michal Skrivanek <
> michal.skrivanek at redhat.com> wrote:
>
>
>
> On 16 Sep 2016, at 15:05, Gianluca Cecchi <gianluca.cecchi at gmail.com>
> wrote:
>
> On Fri, Sep 16, 2016 at 2:50 PM, Michal Skrivanek <
> michal.skrivanek at 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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