6:46 p.m.
Hello,
I am toying an idea involving using oVirt's PM capabilities (esp. the
cluster power_saving policy) in conjuration with some consumer grate
hosts for raw compute applications.
Now, these hosts do not have any lights out or BMC capabilities.
However, they could be started with WOL packets.
Is there a way how this can be done in oVirt? Shutting down hosts with
ssh and starting them with WOL?
Thanks!
--
Daniel Helgenberger
m box bewegtbild GmbH
P: +49/30/2408781-22
F: +49/30/2408781-10
ACKERSTR. 19
D-10115 BERLIN
www.m-box.de www.monkeymen.tv
Geschäftsführer: Martin Retschitzegger / Michaela Göllner
Handeslregister: Amtsgericht Charlottenburg / HRB 112767
12:26 p.m.
----- Original Message -----
From: "Daniel Helgenberger"
<daniel.helgenberger(a)m-box.de>
To: users(a)ovirt.org
Sent: Tuesday, November 18, 2014 5:46:07 PM
Subject: [ovirt-users] Power Management - but no LO?
Hello,
I am toying an idea involving using oVirt's PM capabilities (esp. the
cluster power_saving policy) in conjuration with some consumer grate
hosts for raw compute applications.
Now, these hosts do not have any lights out or BMC capabilities.
However, they could be started with WOL packets.
Is there a way how this can be done in oVirt? Shutting down hosts with
ssh and starting them with WOL?
Yes, but you will have to write your own custom fencing script for that and configure it
as explain in
http://www.ovirt.org/Custom_Fencing (look in the oVirt 3.5 section)
If you need any details, please ask but mainly you should look on the scripts in the
fence-agents package (/usr/sbin/fence_*) and write something that supports the common
flags used by those scripts
Thanks!
--
Daniel Helgenberger
m box bewegtbild GmbH
P: +49/30/2408781-22
F: +49/30/2408781-10
ACKERSTR. 19
D-10115 BERLIN
www.m-box.de www.monkeymen.tv
Geschäftsführer: Martin Retschitzegger / Michaela Göllner
Handeslregister: Amtsgericht Charlottenburg / HRB 112767
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
8:26 p.m.
Hello Eli,
thanks for getting back to me. Sadly the matter does not seem quite
clear for me right now; at least I have to read deeper into fence agents.
On 19.11.2014 10:26, Eli Mesika wrote:
----- Original Message -----
> From: "Daniel Helgenberger" <daniel.helgenberger(a)m-box.de>
> To: users(a)ovirt.org
> Sent: Tuesday, November 18, 2014 5:46:07 PM
> Subject: [ovirt-users] Power Management - but no LO?
>
> Hello,
>
> I am toying an idea involving using oVirt's PM capabilities (esp. the
> cluster power_saving policy) in conjuration with some consumer grate
> hosts for raw compute applications.
>
> Now, these hosts do not have any lights out or BMC capabilities.
> However, they could be started with WOL packets.
>
> Is there a way how this can be done in oVirt? Shutting down hosts with
> ssh and starting them with WOL?
Yes, but you will have to write your own custom fencing script for that and configure it
as explain in
http://www.ovirt.org/Custom_Fencing (look in the oVirt 3.5 section)
Is there any
more documentation available? I found some older docs [1],
are they still valid?
I struggle with how the mapping is done from parameters in the PM tab to
functions in my fence agent, how it is passed to it and how it gets
called in the end.
As I understood so far, oVirt needs to proxy PM/fencing operations and
is using one host of the cluster for fencing; and PM the appropriate
device. Also, I can use engine-config register the fence agent as well
as to map some generic fields.
If you need any details, please ask but mainly you should look on the scripts in the
fence-agents package (/usr/sbin/fence_*) and write something that supports the common
flags used by those scripts
Some basic design concepts I thought of so far:
I assume the virsh fence agent could work for me. It ssh's to the host.
I would call shutdown in this case I think?
Further, while compiling the appropriate WOL packet seems trivial in
python, I need to map an NIC MAC address witch I could get from a
parameter in the PM setup. But in this case, any host could be used
execute the script; preferring the engine in this case? Or is this a bad
approach for some reason? (Assuming the NIC is part of ovirt management
net).
I think I can manage to do this once I have figured out the basic stuff.
Strangely, though I found posts by people who also tried to attempt a
WOL fence agent this as not been accomplished it seems. Can you think of
a reason? (I can think of shutdown, witch needs ssh to be done).
Thanks for any help on the issue.
[1] http://www.ovirt.org/Features/HostPMProxyPreferences
>
> Thanks!
>
> --
> Daniel Helgenberger
> m box bewegtbild GmbH
>
> P: +49/30/2408781-22
> F: +49/30/2408781-10
>
> ACKERSTR. 19
> D-10115 BERLIN
>
>
> www.m-box.de www.monkeymen.tv
>
> Geschäftsführer: Martin Retschitzegger / Michaela Göllner
> Handeslregister: Amtsgericht Charlottenburg / HRB 112767
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
--
Daniel Helgenberger
m box bewegtbild GmbH
P: +49/30/2408781-22
F: +49/30/2408781-10
ACKERSTR. 19
D-10115 BERLIN
www.m-box.de www.monkeymen.tv
Geschäftsführer: Martin Retschitzegger / Michaela Göllner
Handeslregister: Amtsgericht Charlottenburg / HRB 112767
2:10 p.m.
----- Original Message -----
From: "Daniel Helgenberger"
<daniel.helgenberger(a)m-box.de>
To: "Eli Mesika" <emesika(a)redhat.com>
Cc: users(a)ovirt.org
Sent: Wednesday, November 19, 2014 7:26:56 PM
Subject: Re: [ovirt-users] Power Management - but no LO?
Hello Eli,
thanks for getting back to me. Sadly the matter does not seem quite
clear for me right now; at least I have to read deeper into fence agents.
On 19.11.2014 10:26, Eli Mesika wrote:
>
>
> ----- Original Message -----
>> From: "Daniel Helgenberger" <daniel.helgenberger(a)m-box.de>
>> To: users(a)ovirt.org
>> Sent: Tuesday, November 18, 2014 5:46:07 PM
>> Subject: [ovirt-users] Power Management - but no LO?
>>
>> Hello,
>>
>> I am toying an idea involving using oVirt's PM capabilities (esp. the
>> cluster power_saving policy) in conjuration with some consumer grate
>> hosts for raw compute applications.
>>
>> Now, these hosts do not have any lights out or BMC capabilities.
>> However, they could be started with WOL packets.
>>
>> Is there a way how this can be done in oVirt? Shutting down hosts with
>> ssh and starting them with WOL?
>
> Yes, but you will have to write your own custom fencing script for that and
> configure it as explain in
> http://www.ovirt.org/Custom_Fencing (look in the oVirt 3.5 section)
Is there any more documentation available? I found some older docs [1],
are they still valid?
I struggle with how the mapping is done from parameters in the PM tab to
functions in my fence agent, how it is passed to it and how it gets
called in the end.
Please have a look on this lecture I had gave on hangouts :
https://www.youtube.com/watch?v=IuRPGU7nF1E
I believe that it will make you understand the flow and the configuration
As I understood so far, oVirt needs to proxy PM/fencing operations
and
is using one host of the cluster for fencing;
right , but if not found in cluster then dc is searched ...
and PM the appropriate
device. Also, I can use engine-config register the fence agent as well
as to map some generic fields.
Yes, this is the point were you customizing the new agent
this is basically a 2 step task
1) server side, you will have to add your fencing scripts and verify that it installs
correctly in /usr/sbin/
it must be called fence_<agent_name>
it must obey to fence-agents package script parameters defined in
https://fedorahosted.org/cluster/wiki/FenceArguments
2) engine side : use engine-config to configure your new agent
>
> If you need any details, please ask but mainly you should look on the
> scripts in the fence-agents package (/usr/sbin/fence_*) and write
> something that supports the common flags used by those scripts
Some basic design concepts I thought of so far:
I assume the virsh fence agent could work for me. It ssh's to the host.
I would call shutdown in this case I think?
Further, while compiling the appropriate WOL packet seems trivial in
python, I need to map an NIC MAC address witch I could get from a
parameter in the PM setup. But in this case, any host could be used
execute the script; preferring the engine in this case? Or is this a bad
approach for some reason? (Assuming the NIC is part of ovirt management
net).
I think I can manage to do this once I have figured out the basic stuff.
Strangely, though I found posts by people who also tried to attempt a
WOL fence agent this as not been accomplished it seems. Can you think of
a reason? (I can think of shutdown, witch needs ssh to be done).
There is s RFE on adding WOL support, not target version for that yet ....
Thanks for any help on the issue.
[1] http://www.ovirt.org/Features/HostPMProxyPreferences
>
>
>>
>> Thanks!
>>
>> --
>> Daniel Helgenberger
>> m box bewegtbild GmbH
>>
>> P: +49/30/2408781-22
>> F: +49/30/2408781-10
>>
>> ACKERSTR. 19
>> D-10115 BERLIN
>>
>>
>> www.m-box.de www.monkeymen.tv
>>
>> Geschäftsführer: Martin Retschitzegger / Michaela Göllner
>> Handeslregister: Amtsgericht Charlottenburg / HRB 112767
>> _______________________________________________
>> Users mailing list
>> Users(a)ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
--
Daniel Helgenberger
m box bewegtbild GmbH
P: +49/30/2408781-22
F: +49/30/2408781-10
ACKERSTR. 19
D-10115 BERLIN
www.m-box.de www.monkeymen.tv
Geschäftsführer: Martin Retschitzegger / Michaela Göllner
Handeslregister: Amtsgericht Charlottenburg / HRB 112767
3655
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3 comments
2 participants
participants (2)
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Daniel Helgenberger -
Eli Mesika