[ovirt-users] How to execute Virsh command after ovirt installation ?

Wed Jan 4 16:02:52 UTC 2017

Martin,

Thank you for the clarifications. It makes sense.

I just mean that following the Unix way [1] gives benefits. For example, VDSM doesn’t follow DOTADIW [2]. And I believe it could work better if it did.

[1] https://en.wikipedia.org/wiki/Unix_philosophy 
[2] Do One Thing and Do It Well

-----Original Message-----
From: Martin Sivak <msivak at redhat.com>
Date: Wednesday 4 January 2017 at 15:36
To: Pavel Gashev <Pax at acronis.com>
Cc: Fernando Frediani <fernando.frediani at upx.com.br>, "users at ovirt.org" <users at ovirt.org>
Subject: Re: [ovirt-users] How to execute Virsh command after ovirt installation ?

Hi,

We were actually evaluating Pacemaker based hosted engine and talking
to Pacemaker developers, but we hit couple of show stoppers:

- Pacemaker supports limited set of nodes in the default setup (16
iirc, extensible using some kind of relays)
- It uses network based synchronization and requires very low latency
network (we can't guarantee that when migrations are in progress for
example) - the rest of oVirt currently uses storage based
synchronization, so we are in a different world here
- We would basically have to rewrite / duplicate most of the hosted
engine code we already have to get the same scheduling logic (load
penalization, gateway checks, ...)

We decided that rewriting code for no clear benefit was not productive
and stayed with the current hosted engine instead.

Martin

On Wed, Jan 4, 2017 at 12:33 PM, Pavel Gashev <Pax at acronis.com> wrote:
> It's interesting, I have an opposite opinion. I don’t see why oVirt
> reinvents its own HA instead of using Pacemaker. And it’s not old, it’s
> mature ;)
>
>
>
> I my case, I had no option to setup Hosted Engine since migration to oVirt
> required storage rearrangement. Now I have to run HA oVirt VM using
> Pacemaker + DRBD. Works great.
>
>
>
>
>
> From: <users-bounces at ovirt.org> on behalf of Fernando Frediani
> <fernando.frediani at upx.com.br>
> Date: Tuesday 3 January 2017 at 15:38
> To: "users at ovirt.org" <users at ovirt.org>
> Subject: Re: [ovirt-users] How to execute Virsh command after ovirt
> installation ?
>
>
>
> Honestlly I don't see why in 2017 people still using the old DRBD +
> Pacemaker solution for virtualization stuff.
>
>
>
> On 03/01/2017 10:35, TranceWorldLogic . wrote:
>
> Thanks, I agree bad idea to execute virsh command without knowing vdsm and
> engine.
>
> Is their any plan in ovirt to support drbd + Pacemaker ?
>
>
>
>
>
> On Tue, Jan 3, 2017 at 4:29 PM, Michal Skrivanek
> <michal.skrivanek at redhat.com> wrote:
>
>
>
> On 3 Jan 2017, at 11:55, Nathanaël Blanchet <blanchet at abes.fr> wrote:
>
>
>
> except for quickly get RO informations like "virsh capabilities".
>
> When you come from libvirt and you know what to do, you might not want to
> find/read a dedicated documentation for such a little query.
>
>
>
> yes, sure, for read-only
>
> but for any modification, no matter how minimal, it’s almost always needed
> to inform vdsm/engine to know about it to prevent corner cases,
> misdetections, etc...
>
>
>
>
>
> Le 03/01/2017 à 11:19, Michal Skrivanek a écrit :
>
>
>
> On 3 Jan 2017, at 11:15, Nathanaël Blanchet <blanchet at abes.fr> wrote:
>
>
>
> Use at your own risks:
>
> vdsm at ovirt:shibboleth
>
> But, you may unsynchronize your host HW with engine database.
>
>
>
> it is almost always a bad idea to do that
>
> hooks are exactly for the cases like below, just in a cleaner way
>
>
>
>
>
> Le 03/01/2017 à 11:09, Yaniv Dary a écrit :
>
> It is preferable you use VDSM hooks to add devices to VMs.
>
>
> Yaniv Dary
>
> Technical Product Manager
>
> Red Hat Israel Ltd.
>
> 34 Jerusalem Road
>
> Building A, 4th floor
>
> Ra'anana, Israel 4350109
>
>
>
> Tel : +972 (9) 7692306
>
>         8272306
>
> Email: ydary at redhat.com
>
> IRC : ydary
>
>
>
> On Tue, Jan 3, 2017 at 10:58 AM, TranceWorldLogic .
> <tranceworldlogic at gmail.com> wrote:
>
> Hi Joop,
>
> I want to add drdb device in vm instance hence would like to execute virsh
> command.
>
> Is it possible ?
>
>
>
> Thanks,
>
> ~Rohit
>
>
>
>
>
> On Tue, Jan 3, 2017 at 1:26 PM, jvandewege <jvandewege at nieuwland.nl> wrote:
>
> On 3-1-2017 8:32, TranceWorldLogic . wrote:
>> Hi,
>>
>> I tried execution below virsh command after ovirt installation.
>> but it requesting username and password.
>>
>> ~# virsh list --all
>> Please enter your authentication name:
>>
>> Please let me know which username and password I have to provide ?
> If you only need read access then you need to supply -r as an additional
> argument.
>
> Why do you need virsh because that will only give you the info on that
> host, using ovirt-shell gives you the info for all hosts.
>
> Joop
>
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> --
>
> Nathanaël Blanchet
>
>
>
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>
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>
>
>
> Supervision réseau
>
> Pôle Infrastrutures Informatiques
>
> 227 avenue Professeur-Jean-Louis-Viala
>
> 34193 MONTPELLIER CEDEX 5
>
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>
> Fax  33 (0)4 67 54 84 14
>
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>
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