[ovirt-users] 2 hosts starting the engine at the same time?

[Yedidyah Bar David]

On Mon, Jul 10, 2017 at 6:42 PM, Gianluca Cecchi
<gianluca.cecchi at gmail.com> wrote:
> On Mon, Jul 10, 2017 at 4:38 PM, Yedidyah Bar David <didi at redhat.com> wrote:
>>
>>
>> >
>> > Currently I have set the environment in global maintenance.
>> > Does it make sense to try to start the HostedEngine with an alternate
>> > vm.conf to crosscheck it it is then able to start ok?
>>
>> Not sure. Depends on why you think it currently fails. Sorry but I didn't
>> check your logs yet.
>
>
> Because in 4.1.2 it started. During update to 4.1.3 I moved the engine vm
> without problems to the already updated hosts.
> But I suppose during migration the qemu-kvm command line is preserverd,
> isn't it?
> And only when I planned to update kernel of the engine vm so I had to power
> off it, I began to have problems....
>
>>
>>
>> > I see that there is the file /var/run/ovirt-hosted-engine-ha/vm.conf
>> > that
>> > seems refreshed every minute
>>
>> Indeed. In recent versions it's possible to change some of the HE VM
>> configuration from the engine itself, just like any other VM, so HA
>> has to update this file.
>>
>> >
>> > It seems that apparently I can copy it into another place, modify it and
>> > try
>> > to start engine with the modified file using
>> >
>> > hosted-engine --vm-start --vm-conf=/alternate/path_vm.conf
>> >
>> > is it correct?
>>
>> Yes, as also written here:
>>
>>
>> https://www.ovirt.org/documentation/how-to/hosted-engine/#handle-engine-vm-boot-problems
>>
>> >
>> > the modified file would be such that:
>> >
>> > [root at ovirt02 images]# diff /var/run/ovirt-hosted-engine-ha/vm.conf
>> > /root/alternate_vm.conf
>> > 1,2c1,2
>> > < cpuType=Broadwell
>> > < emulatedMachine=pc-i440fx-rhel7.3.0
>> > ---
>> >> cpuType=qemu64
>> >> emulatedMachine=pc-i440fx-rhel7.2.0
>> > [root at ovirt02 images]#
>>
>> No idea about your specific issue or whether this can fix it, but you can
>> try.
>> Especially if you can test on a test env...
>>
>> Best,
>> --
>> Didi
>
>
> And in fact the engine vm is now up again with the customized parameters
> How can I have it permanent? Frome where on shared storage are they read?

I think you are supposed to change such parameters from the engine ui, not
by directly manipulating the shared storage using [1]. But I didn't try this
myself, not sure if cpu type can be changed.

[1] http://www.ovirt.org/develop/release-management/features/sla/hosted-engine-edit-configuration-on-shared-storage/

>
> Possibly the problems is generated by my nested environment:
>
> L0 = ESXi 6.0 U2 on NUC6i5syh
> L1 are my oVirt hosts on this L0
> L2 is my engine VM that doesn't start in 4.1.3
>
> it seems that
> cpuType=Broadwell and/or emulatedMachine=pc-i440fx-rhel7.3.0
> generates problems....

No idea about this, adding Michal.

Best,

>
> And I think I would have same problems with ordinary VMs, correct?
> Gianluca



-- 
Didi