[Linux-cluster] [Q] Good documentation about command line interface??

Hiroyuki Sato hiroysato at gmail.com
Mon May 30 14:49:15 UTC 2011

Hello Digimer.

Thank you for your advice.
It is very very useful information for me.

> a) Forcing a node to power off, or does it just start an ACPI shutdown?

Maybe ok. I'll test it.

> b) Can you check that the node is successfully off using wol?

I'm not sure, I'll test it.

Could you tell me one more thing.

Where fenced will call fence agent??
It is mean that  the following

 * Can I check where fenced daemon will call fence_agent when I
execute fence_node??
   (that message send to master fenced, or localhost??)
 * And Can I check ``where are master''  with command?? (If fenced is
master-slave type)
 * Can I control master priority.
   (for example I want to specify gfs1, gfs2, gfs3 as fenced master)

Thanks again


2011/5/30 Digimer <linux at alteeve.com>:
> On 05/30/2011 07:35 AM, Hiroyuki Sato wrote:
>> Hello Digimer
>> Thank you for your advice.
>> * GNBD
>>   I've already succeed to mount GNBD.
>>   locking_type = 1
>>   Should I change lock_type = 3 ?,
>>   If not, what problem will be occur??
> To be honest, I'm not familiar with GNBD. The locking needs to use DLM I do
> believe, so check the documentation to ensure that is the case.
>> * fence_apc
>>  some of reason, I can't get use APC switch.
>>  (That configuration example is test environment. )
>>  so I asked alternative solution.
> Ah, ok.
>> * fence_wol
>>  I can't find fence_wake_on_lan. so I'm thinking to create it.
>>  WOL supports Power on and Power off ( I'll test later ).
>>  So, It's will be fence tool.
>>  And I downloaded fence_na, It was written in Perl script.
>>  so I want to change fence_na to use wol command.
>>  Could you point me to good reference to build fence_wol.
>>  (Of course!!. fence_na is good reference)
> Does wake-on-lan allow for:
> a) Forcing a node to power off, or does it just start an ACPI shutdown?
> b) Can you check that the node is successfully off using wol?
> Unless wol can force a node off (ie: in the case of a hung OS) and can
> return the current power state of the node, then I would be hesitant to use
> it.
> As a general question though; You will need to write a script that follows
> the FenceAgentAPI:
> https://fedorahosted.org/cluster/wiki/FenceAgentAPI
> You could make a few Node Assassin devices if you have access to Arduino
> boards and don't mind soldering. However, you have 13 nodes, so you'd need
> five of them... Not sure if that is feasible. If you want to to a test
> cluster with fewer nodes though, it's probably more reasonable.
> --
> Digimer
> E-Mail:              digimer at alteeve.com
> Freenode handle:     digimer
> Papers and Projects: http://alteeve.com
> Node Assassin:       http://nodeassassin.org
> "I feel confined, only free to expand myself within boundaries."

Hiroyuki Sato

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