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Subject: Re: [OMPI users] This must be ssh problem, but I can't figure out what it is...
From: Tena Sakai (tsakai_at_[hidden])
Date: 2011-02-18 12:54:09

Hi Ashley,

> If you do this I would appreciate the chance to proof-read it before you go
> public...

Absolutely! I am a firm believer in two-heads-are-better-than-
one concept.



On 2/18/11 1:29 AM, "Ashley Pittman" <ashley_at_[hidden]> wrote:

> On 18 Feb 2011, at 09:09, Tena Sakai wrote:
>> I had created a security group "intra." I opened ssh port from 0 to
>> 65535, and launched instances (I unleashed 2 at a time in a same
>> geography zone) each belonging to the group intra. So, here, ssh
>> is a security rule of a security group intra. A field for each
>> rule is "source." I had different settings for the source field,
>> but what I had been failing to do is to have this field known by
>> the name of the group, namely intra. By doing so, each instance
>> that belongs to this group can get to each other.
> I'm glad you got to the bottom of the problem, I've never fully understood the
> EC2 "Security Groups" but I found that the default group was adequate and I
> didn't need to create my own. Now that I look at it more closely it appears
> to open all incoming ports to the local instances and incoming port 22 to the
> world which would agree with I've seen.
>> Many thanks for your guidance all along. In a week or two, I look
>> forward to put together a mini "how-to openMPI on cloud".
> If you do this I would appreciate the chance to proof-read it before you go
> public, I have many thousands of hours of EC2 time to my name and have spent
> much of it configuring and testing MPI librarys within them to allow me to
> test my debugger which sits on top of them.
> Ashley.