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From Audrey Roberto B Baldin <>
Subject Re: KVM hypervm and HA
Date Wed, 12 Jul 2017 13:28:17 GMT
Hello Victor,

As far as I tested the HA in KVM, it only get in action if:

i. The computing offer you are using to create the guest VM has the Offer HA flag on;
ii. The KVM should crash unexpectedly;

To force a crash you can simulate a kernel panic using the command: echo c > /proc/sysrq-trigger.

I had some issues that one KVM agent, for some unknown reason, was disconnecting from the
orchestrator, although it was working and the guest VM were running. In this situation I couldn't
do anything with the guests VMs (move, reload, shutdown) and the HA didn't work.

Hope you find this information useful.


----- Mensagem original -----
De: "Ivan Kudryavtsev" <>
Para: "victor" <>
Cc: "users" <>
Enviadas: Quarta-feira, 12 de julho de 2017 6:55:00
Assunto: Re: KVM hypervm and HA

You should mark VM service offering as HA-enabled and ACS will start vms
automatically. VR, SSVM, CP VMs are also started automatically as needed.

2017-07-12 16:53 GMT+07:00 victor <>:

> Hello,
> Thanks for the update.  When a single vm in "hypervm1" is stopped or down,
> it gets automatically started in the second vm. But when the entire
> hypervm1 server  is down completely, the vm' inside it is not getting
> started in the secondary "hypervm2". Is the feature is version specific.
> Regards
> Victor
> On 07/12/2017 08:26 AM, Ivan Kudryavtsev wrote:
>> Hi, Victor. They both will be moved automatically to a new host by ACS.
>> 12 июл. 2017 г. 5:23 пользователь "victor" <>
>> написал:
>> Hello,
>>>   I have a cloudstack system with one management server, one nfs server
>>> and
>>> two kvm hypervm host servers. Initially I configured cloudstack  with
>>> hypervm1, so the system vm  and console proxy gets created in it. Lately
>>> I
>>> have added hypervm2 and created few instances in it. So my doubt is the
>>> following.
>>> --------
>>> 1, If hypervm 1 is down which contain system-vm,console-proxy and
>>> router-vm, then what will happen.
>>> 2, If hypervm 1 is down completely and we couldn't make it up, will the
>>> system vm,console proxy and router vm will be switched to hypervm2
>>> automatically.  If it is not automatically, then is there any option for
>>> that.
>>> ====
>>> Regards
>>> Victor

With best regards, Ivan Kudryavtsev
Bitworks Software, Ltd.
Cell: +7-923-414-1515
WWW: <>

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