You're welcome.

Not a problem.

I was trying to email somebody more directly about this with this recommended 
change only because I just encountered this problem, where a bit of time, 
trying to figure out why OpenFOAM on OpenMPI, trying to get it running across 
the nodes wasn't working.

Then I was like "wait a minute. Let me see if can remotely log into each other" 
and that's when I found this and figured out it was the problem. Once the keys 
were ennumerated, OpenFOAM was able to run without any further OpenMPI related 



From: users <> on behalf of Jeff Squyres 
(jsquyres) via users <>
Sent: January 9, 2019 1:12 PM
To: Open MPI User's List
Cc: Jeff Squyres (jsquyres)
Subject: Re: [OMPI users] Suggestion to add one thing to look/check for when 
running OpenMPI program

Good suggestion; thank you!

> On Jan 8, 2019, at 9:44 PM, Ewen Chan <> wrote:
> To Whom It May Concern:
> Hello. I'm new here and I got here via OpenFOAM.
> In the FAQ regarding running OpenMPI programs, specifically where someone 
> might be able to run their OpenMPI program on a local node, but not a remote 
> node, I would like to add the following for people to check:
> Make sure that you can ssh between all of the notes, permutatively.
> This often requires setting up passwordless ssh access so if you have two 
> nodes, make sure that you can ssh into each other from each other without any 
> issues.
> I just had it happen where I forgot to perform this check and so it was 
> trying to ennumerate the ECDSA key to ~/.ssh/known_hosts and that prompt was 
> preventing OpenFOAM from running on my multi-node cluster.
> Thank you.
> Sincerely,
> Ewen Chan
> _______________________________________________
> users mailing list

Jeff Squyres

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