Re: [xcat-user] Embedding GPFS 3.5 into xcat diskless boot images

[Christian Caruthers]

That's a good point, Lisa. A way around that is to not use the MN in rc.local, but rather the GPFS primary or secondary server. You can even get clever and use a ping test to make sure one or the other is online before running mmsdrrestore.

I forgot the security side of not allowing SSH from the compute nodes to the MN.

Regards,
Christian Caruthers
Senior Consultant - System x Linux HPC
Mobile: 757-289-9872
Find me on LinkedIn


-----Lissa Valletta/Poughkeepsie/IBM@IBMUS wrote: -----

To: xCAT Users Mailing list <xcat-user@lists.sourceforge.net>
From: Lissa Valletta/Poughkeepsie/IBM@IBMUS
Date: 01/23/2014 12:29PM
Cc: xcat-user@lists.sourceforge.net
Subject: Re: [xcat-user] Embedding GPFS 3.5 into xcat diskless boot images

By default,  xCAT does not allow ssh from the compute nodes ( passwordless) to the MN.   It only sets up passwordless ssh from the MN to the compute nodes.

The attribute sshbetweennodes set to "NOGROUPS"   actually is used to not allow passwordless ssh between the compute nodes.  

But the man page is a little vague.  I will improve it.

Lissa K. Valletta
8-3/B10
Poughkeepsie, NY 12601
(tie 293) 433-3102



Christopher Samuel ---01/22/2014 09:53:00 PM--------BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

From: Christopher Samuel <sam...@unimelb.edu.au>
To: xcat-user@lists.sourceforge.net,
Date: 01/22/2014 09:53 PM
Subject: Re: [xcat-user] Embedding GPFS 3.5 into xcat diskless boot images

---

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 23/01/14 06:26, Christian Caruthers wrote:

> In the past, with stateless nodes, I install the rpms during image
> build and set rc.local to run mmsdrrestore on the stateless node to
> sync it with the cluster.

We use statelite and set this in litefile:

"ALL","/var/mmfs/","persistent",,

so their state persists across reboots.

Handy as we don't permit SSH back from compute/login nodes to the
management node as root (sshbetweennodes set to "NOGROUPS").

cheers,
Chris
- --
Christopher Samuel        Senior Systems Administrator
VLSCI - Victorian Life Sciences Computation Initiative
Email: sam...@unimelb.edu.au Phone: +61 (0)3 903 55545
http://www.vlsci.org.au/      http://twitter.com/vlsci

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