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Unless, there is something, i am unaware of mmdsh can also be constraind to a set of designated nodes based on ssh keys. So not sure why it is more or less than xdsh or pdsh. It seems the same.
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<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman"">Steven A. Daniels<span style="mso-font-kerning:0pt;mso-ligatures:none"><o:p></o:p></span></span></p>
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<p class="MsoNormal"><span style="mso-fareast-font-family:"Times New Roman"">Fax and Voice: 303-810-1229</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> gpfsug-discuss <gpfsug-discuss-bounces@gpfsug.org> on behalf of Jonathan Buzzard <jonathan.buzzard@strath.ac.uk><br>
<b>Sent:</b> Monday, July 21, 2025 12:08 PM<br>
<b>To:</b> gpfsug-discuss@gpfsug.org <gpfsug-discuss@gpfsug.org><br>
<b>Subject:</b> [EXTERNAL] Re: [gpfsug-discuss] mmdsh rest api command</font>
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<div class="PlainText"><br>
[SNIP]<br>
<br>
> <br>
> Aren't xcat, pdsh, etc, based on passwordless root ssh as well? If<br>
> so, they don't solve my clients issues. I don't see them as better<br>
> than mmdsh just different authors of the same type of tool.<br>
><br>
Currently GPFS requires all nodes to be able to SSH onto all other nodes <br>
as root without a password. Noting at the moment the native RestAPI is <br>
an experimental feature.<br>
<br>
This root level access across the entire system in a many to many <br>
fashion has always been an security issue. This is especially true in an <br>
HPC environment were end users get to log onto nodes that are part of a <br>
GPFS cluster. If anyone gets root on any node on the system then its <br>
game over.<br>
<br>
The likes of xdsh and pdsh allow *designated* nodes to be able to SSH <br>
onto other nodes without a password in a one to many fashion. That is <br>
fundamentally different to mmdsh. Further you can configure them to need <br>
an SSH key which is secured with a passphrase for additional security.<br>
<br>
Basically in this sort of scenario with xdsh/pdsh etc. only running on <br>
highly protected nodes with limited access you have substantially <br>
enhanced your security over mmdsh and why mmdsh's continued existence is<br>
not only not required but not desirable IMHO.<br>
<br>
There is also no need for the host running xdsh/pdsh etc. to be part of <br>
the GPFS cluster.<br>
<br>
That does mean some people relying on mmdsh will have to change how they <br>
work. However continuing with bad practice when other more secure <br>
options exist is IMHO unprofessional at best and give the current cyber <br>
security environment frankly down right negligent.<br>
<br>
<br>
JAB.<br>
<br>
-- <br>
Jonathan A. Buzzard Tel: +44141-5483420<br>
HPC System Administrator, ARCHIE-WeSt.<br>
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG<br>
<br>
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