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Subject: Re: [OMPI users] How does authentication between nodes work without password? (Newbie alert on)
From: Tena Sakai (tsakai_at_[hidden])
Date: 2011-02-13 22:54:11


Hi Gus,

I have digressed and started downward descent...

I was trying to make a simple and clear case. Everything
I write in this very mail is about local machines. There
is no virtual machines involved. I am talking about two
machines, vixen and dasher, which share the same file
structure. Vixen is a nfs server and dasher is an nfs
client. I have just installed openmpi 1.4.3 on dasher,
which is the same version I have on vixen.

I have a file app.ac3, which looks like:
  [tsakai_at_vixen Rmpi]$ cat app.ac3
  -H dasher.egcrc.org -np 1 hostname
  -H dasher.egcrc.org -np 1 hostname
  -H vixen.egcrc.org -np 1 hostname
  -H vixen.egcrc.org -np 1 hostname
  [tsakai_at_vixen Rmpi]$

Vixen can run this without any problem:
  [tsakai_at_vixen Rmpi]$ mpirun -app app.ac3
  vixen.egcrc.org
  vixen.egcrc.org
  dasher.egcrc.org
  dasher.egcrc.org
  [tsakai_at_vixen Rmpi]$

But I can't run this very command from dasher:
  [tsakai_at_vixen Rmpi]$
  [tsakai_at_vixen Rmpi]$ ssh dasher
  Last login: Sun Feb 13 19:26:57 2011 from vixen.egcrc.org
  [tsakai_at_dasher ~]$
  [tsakai_at_dasher ~]$ cd Notes/R/parallel/Rmpi/
  [tsakai_at_dasher Rmpi]$
  [tsakai_at_dasher Rmpi]$ mpirun -app app.ac3
  mpirun: killing job...

  --------------------------------------------------------------------------
  mpirun noticed that the job aborted, but has no info as to the process
  that caused that situation.
  --------------------------------------------------------------------------
  --------------------------------------------------------------------------
  mpirun was unable to cleanly terminate the daemons on the nodes shown
  below. Additional manual cleanup may be required - please refer to
  the "orte-clean" tool for assistance.
  --------------------------------------------------------------------------
        vixen.egcrc.org - daemon did not report back when launched
  [tsakai_at_dasher Rmpi]$

After I issue the mpirun command, it hangs and I had to Cntrol-C out
of it at which point it generated all lines " mpirun: killing job..."
and below.

A strange thing is that dahser has no problem executing the same
thing via ssh:
  [tsakai_at_dasher Rmpi]$ ssh vixen.egcrc.org hostname
  vixen.egcrc.org
  [tsakai_at_dasher Rmpi]$

In fact, dasher can run it via mpirun so long as no foreign machine
is present in the app file. Ie.,
  [tsakai_at_dasher Rmpi]$ cat app.ac4
  -H dasher.egcrc.org -np 1 hostname
  -H dasher.egcrc.org -np 1 hostname
  # -H vixen.egcrc.org -np 1 hostname
  # -H vixen.egcrc.org -np 1 hostname
  [tsakai_at_dasher Rmpi]$
  [tsakai_at_dasher Rmpi]$ mpirun -app app.ac4
  dasher.egcrc.org
  dasher.egcrc.org
  [tsakai_at_dasher Rmpi]$

Can you please tell me why I can go one way (from vixen to dasher)
and not the other way (dasher to vixen)?

Thank you.

Tena

On 2/12/11 9:42 PM, "Gustavo Correa" <gus_at_[hidden]> wrote:

> Hi Tena
>
> Thank you for taking the time to explain the details of
> the EC2 procedure.
>
> I am afraid everything in my bag of tricks was used.
> As Ralph and Jeff suggested, this seems to be a very specific
> problem with EC2.
>
> The difference in behavior when you run as root vs. when you
> run as Tena, tells that there is some use restriction to regular users
> in EC2 that isn't present in common machines (Linux or other), I guess.
> This may be yet another 'stone to turn', as you like to say.
> It also suggests that there is nothing wrong in principle with your
> openMPI setup or with your program, otherwise root would not be able to run
> it.
>
> Besides Ralph suggestion of trying the EC2 mailing list archive,
> I wonder if EC2 has any type of user support where you could ask
> for help.
> After all, it is a paid sevice, isn't it?
> (OpenMPI is not paid and has a great customer service, doesn't it? :) )
> You have a well documented case to present,
> and the very peculiar fact that the program fails for normal users but runs
> for root.
> This should help the EC2 support to start looking for a solution.
>
> I am running out of suggestions of what you could try on your own.
> But let me try:
>
> 1) You may try to reduce the problem to its less common denominator,
> perhaps by trying to run non-R based MPI programs on EC2, maybe the hello_c.c,
> ring_c.c, and connectivity_c.c programs in the OpenMPi examples directory.
> This would be to avoid the extra layer of complexity introduced by R.
> Even simpler would be to run 'hostname' with mpiexec (mpiexec -np 2 hostname).
> I.e. go in a progression of increasing complexity, see where you hit the wall.
> This may shed some light on what is going on.
>
> I don't know if this suggestion may really help, though.
> It is not clear to me where the thing fails, whether it is during program
> execution,
> or while mpiexec is setting up the environment for the program to run.
> If it is very early in the process, before the program starts, my suggestion
> won't work.
> Jeff and Ralph, who know OpenMPI inside out, may have better advice in this
> regard.
>
> 2) Another thing would be to try to run R on E2C in serial mode, without
> mpiexec,
> interactively or via script, to see who EC2 doesn't like: R or OpenMPI (but
> maybe it's both).
>
> Gus Correa
>
> On Feb 11, 2011, at 9:54 PM, Tena Sakai wrote:
>
>> Hi Gus,
>>
>> Thank you for your tips.
>>
>> I didn't find any smoking gun or anything comes close.
>> Here's the upshot:
>>
>> [tsakai_at_ip-10-114-239-188 ~]$ ulimit -a
>> core file size (blocks, -c) 0
>> data seg size (kbytes, -d) unlimited
>> scheduling priority (-e) 0
>> file size (blocks, -f) unlimited
>> pending signals (-i) 61504
>> max locked memory (kbytes, -l) 32
>> max memory size (kbytes, -m) unlimited
>> open files (-n) 1024
>> pipe size (512 bytes, -p) 8
>> POSIX message queues (bytes, -q) 819200
>> real-time priority (-r) 0
>> stack size (kbytes, -s) 8192
>> cpu time (seconds, -t) unlimited
>> max user processes (-u) 61504
>> virtual memory (kbytes, -v) unlimited
>> file locks (-x) unlimited
>> [tsakai_at_ip-10-114-239-188 ~]$
>> [tsakai_at_ip-10-114-239-188 ~]$ sudo su
>> bash-3.2#
>> bash-3.2# ulimit -a
>> core file size (blocks, -c) 0
>> data seg size (kbytes, -d) unlimited
>> scheduling priority (-e) 0
>> file size (blocks, -f) unlimited
>> pending signals (-i) 61504
>> max locked memory (kbytes, -l) 32
>> max memory size (kbytes, -m) unlimited
>> open files (-n) 1024
>> pipe size (512 bytes, -p) 8
>> POSIX message queues (bytes, -q) 819200
>> real-time priority (-r) 0
>> stack size (kbytes, -s) 8192
>> cpu time (seconds, -t) unlimited
>> max user processes (-u) unlimited
>> virtual memory (kbytes, -v) unlimited
>> file locks (-x) unlimited
>> bash-3.2#
>> bash-3.2#
>> bash-3.2# ulimit -a > root_ulimit-a
>> bash-3.2# exit
>> [tsakai_at_ip-10-114-239-188 ~]$
>> [tsakai_at_ip-10-114-239-188 ~]$ ulimit -a > tsakai_ulimit-a
>> [tsakai_at_ip-10-114-239-188 ~]$
>> [tsakai_at_ip-10-114-239-188 ~]$ diff root_ulimit-a tsakai_ulimit-a
>> 14c14
>> < max user processes (-u) unlimited
>> ---
>>> max user processes (-u) 61504
>> [tsakai_at_ip-10-114-239-188 ~]$
>> [tsakai_at_ip-10-114-239-188 ~]$ cat /proc/sys/fs/file-nr
>> /proc/sys/fs/file-max
>> 480 0 762674
>> 762674
>> [tsakai_at_ip-10-114-239-188 ~]$
>> [tsakai_at_ip-10-114-239-188 ~]$ sudo su
>> bash-3.2#
>> bash-3.2# cat /proc/sys/fs/file-nr /proc/sys/fs/file-max
>> 512 0 762674
>> 762674
>> bash-3.2# exit
>> exit
>> [tsakai_at_ip-10-114-239-188 ~]$
>> [tsakai_at_ip-10-114-239-188 ~]$
>> [tsakai_at_ip-10-114-239-188 ~]$ sysctl -a |grep fs.file-max
>> -bash: sysctl: command not found
>> [tsakai_at_ip-10-114-239-188 ~]$
>> [tsakai_at_ip-10-114-239-188 ~]$ /sbin/!!
>> /sbin/sysctl -a |grep fs.file-max
>> error: permission denied on key 'kernel.cad_pid'
>> error: permission denied on key 'kernel.cap-bound'
>> fs.file-max = 762674
>> [tsakai_at_ip-10-114-239-188 ~]$
>> [tsakai_at_ip-10-114-239-188 ~]$ sudo /sbin/sysctl -a | grep fs.file-max
>> fs.file-max = 762674
>> [tsakai_at_ip-10-114-239-188 ~]$
>>
>> I see a bit of difference between root and tsakai, but I cannot
>> believe such small difference results in somewhat a catastrophic
>> failure as I have reported. Would you agree with me?
>>
>> Regards,
>>
>> Tena
>>
>> On 2/11/11 6:06 PM, "Gus Correa" <gus_at_[hidden]> wrote:
>>
>>> Hi Tena
>>>
>>> Please read one answer inline.
>>>
>>> Tena Sakai wrote:
>>>> Hi Jeff,
>>>> Hi Gus,
>>>>
>>>> Thanks for your replies.
>>>>
>>>> I have pretty much ruled out PATH issues by setting tsakai's PATH
>>>> as identical to that of root. In that setting I reproduced the
>>>> same result as before: root can run mpirun correctly and tsakai
>>>> cannot.
>>>>
>>>> I have also checked out permission on /tmp directory. tsakai has
>>>> no problem creating files under /tmp.
>>>>
>>>> I am trying to come up with a strategy to show that each and every
>>>> programs in the PATH has "world" executable permission. It is a
>>>> stone to turn over, but I am not holding my breath.
>>>>
>>>>> ... you are running out of file descriptors. Are file descriptors
>>>>> limited on a per-process basis, perchance?
>>>>
>>>> I have never heard there is such restriction on Amazon EC2. There
>>>> are folks who keep running instances for a long, long time. Whereas
>>>> in my case, I launch 2 instances, check things out, and then turn
>>>> the instances off. (Given that the state of California has a huge
>>>> debts, our funding is very tight.) So, I really doubt that's the
>>>> case. I have run mpirun unsuccessfully as user tsakai and immediately
>>>> after successfully as root. Still, I would be happy if you can tell
>>>> me a way to tell number of file descriptors used or remmain.
>>>>
>>>> Your mentioned file descriptors made me think of something under
>>>> /dev. But I don't know exactly what I am fishing. Do you have
>>>> some suggestions?
>>>>
>>>
>>> 1) If the environment has anything to do with Linux,
>>> check:
>>>
>>> cat /proc/sys/fs/file-nr /proc/sys/fs/file-max
>>>
>>>
>>> or
>>>
>>> sysctl -a |grep fs.file-max
>>>
>>> This max can be set (fs.file-max=whatever_is_reasonable)
>>> in /etc/sysctl.conf
>>>
>>> See 'man sysctl' and 'man sysctl.conf'
>>>
>>> 2) Another possible source of limits.
>>>
>>> Check "ulimit -a" (bash) or "limit" (tcsh).
>>>
>>> If you need to change look at:
>>>
>>> /etc/security/limits.conf
>>>
>>> (See also 'man limits.conf')
>>>
>>> **
>>>
>>> Since "root can but Tena cannot",
>>> I would check 2) first,
>>> as they are the 'per user/per group' limits,
>>> whereas 1) is kernel/system-wise.
>>>
>>> I hope this helps,
>>> Gus Correa
>>>
>>> PS - I know you are a wise and careful programmer,
>>> but here we had cases of programs that would
>>> fail because of too many files that were open and never closed,
>>> eventually exceeding the max available/permissible.
>>> So, it does happen.
>>>
>>>> I wish I could reproduce this (weired) behavior on a different
>>>> set of machines. I certainly cannot in my local environment. Sigh!
>>>>
>>>> Regards,
>>>>
>>>> Tena
>>>>
>>>>
>>>> On 2/11/11 3:17 PM, "Jeff Squyres (jsquyres)" <jsquyres_at_[hidden]> wrote:
>>>>
>>>>> It is concerning if the pipe system call fails - I can't think of why that
>>>>> would happen. Thats not usually a permissions issue but rather a deeper
>>>>> indication that something is either seriously wrong on your system or you
>>>>> are
>>>>> running out of file descriptors. Are file descriptors limited on a
>>>>> per-process
>>>>> basis, perchance?
>>>>>
>>>>> Sent from my PDA. No type good.
>>>>>
>>>>> On Feb 11, 2011, at 10:08 AM, "Gus Correa" <gus_at_[hidden]> wrote:
>>>>>
>>>>>> Hi Tena
>>>>>>
>>>>>> Since root can but you can't,
>>>>>> is is a directory permission problem perhaps?
>>>>>> Check the execution directory permission (on both machines,
>>>>>> if this is not NFS mounted dir).
>>>>>> I am not sure, but IIRR OpenMPI also uses /tmp for
>>>>>> under-the-hood stuff, worth checking permissions there also.
>>>>>> Just a naive guess.
>>>>>>
>>>>>> Congrats for all the progress with the cloudy MPI!
>>>>>>
>>>>>> Gus Correa
>>>>>>
>>>>>> Tena Sakai wrote:
>>>>>>> Hi,
>>>>>>> I have made a bit more progress. I think I can say ssh authenti-
>>>>>>> cation problem is behind me now. I am still having a problem running
>>>>>>> mpirun, but the latest discovery, which I can reproduce, is that
>>>>>>> I can run mpirun as root. Here's the session log:
>>>>>>> [tsakai_at_vixen ec2]$ 2ec2 ec2-184-73-104-242.compute-1.amazonaws.com
>>>>>>> Last login: Fri Feb 11 00:41:11 2011 from 10.100.243.195
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ ll
>>>>>>> total 8
>>>>>>> -rw-rw-r-- 1 tsakai tsakai 274 Feb 11 00:47 app.ac
>>>>>>> -rwxr-xr-x 1 tsakai tsakai 379 Feb 11 00:48 fib.R
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ ll .ssh
>>>>>>> total 16
>>>>>>> -rw------- 1 tsakai tsakai 232 Feb 5 23:19 authorized_keys
>>>>>>> -rw------- 1 tsakai tsakai 102 Feb 11 00:34 config
>>>>>>> -rw-r--r-- 1 tsakai tsakai 1302 Feb 11 00:36 known_hosts
>>>>>>> -rw------- 1 tsakai tsakai 887 Feb 8 22:03 tsakai
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ ssh ip-10-100-243-195.ec2.internal
>>>>>>> Last login: Fri Feb 11 00:36:20 2011 from 10.195.198.31
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$ # I am on machine B
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$ hostname
>>>>>>> ip-10-100-243-195
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$ ll
>>>>>>> total 8
>>>>>>> -rw-rw-r-- 1 tsakai tsakai 274 Feb 11 00:44 app.ac
>>>>>>> -rwxr-xr-x 1 tsakai tsakai 379 Feb 11 00:47 fib.R
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$ cat app.ac
>>>>>>> -H ip-10-195-198-31.ec2.internal -np 1 Rscript /home/tsakai/fib.R 5
>>>>>>> -H ip-10-195-198-31.ec2.internal -np 1 Rscript /home/tsakai/fib.R 6
>>>>>>> -H ip-10-100-243-195.ec2.internal -np 1 Rscript /home/tsakai/fib.R 7
>>>>>>> -H ip-10-100-243-195.ec2.internal -np 1 Rscript /home/tsakai/fib.R 8
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$ # go back to machine A
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$
>>>>>>> [tsakai_at_ip-10-100-243-195 ~]$ exit
>>>>>>> logout
>>>>>>> Connection to ip-10-100-243-195.ec2.internal closed.
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ hostname
>>>>>>> ip-10-195-198-31
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ # Execute mpirun
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ mpirun -app app.ac
>>>>>>>
>>>>>>> ------------------------------------------------------------------------
>>>>>>> --
>>>>>>> mpirun was unable to launch the specified application as it encountered
>>>>>>> an
>>>>>>> error:
>>>>>>> Error: pipe function call failed when setting up I/O forwarding
>>>>>>> subsystem
>>>>>>> Node: ip-10-195-198-31
>>>>>>> while attempting to start process rank 0.
>>>>>>>
>>>>>>> ------------------------------------------------------------------------
>>>>>>> --
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ # try it as root
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ sudo su
>>>>>>> bash-3.2#
>>>>>>> bash-3.2# pwd
>>>>>>> /home/tsakai
>>>>>>> bash-3.2#
>>>>>>> bash-3.2# ls -l /root/.ssh/config
>>>>>>> -rw------- 1 root root 103 Feb 11 00:56 /root/.ssh/config
>>>>>>> bash-3.2#
>>>>>>> bash-3.2# cat /root/.ssh/config
>>>>>>> Host *
>>>>>>> IdentityFile /root/.ssh/.derobee/.kagi
>>>>>>> IdentitiesOnly yes
>>>>>>> BatchMode yes
>>>>>>> bash-3.2#
>>>>>>> bash-3.2# pwd
>>>>>>> /home/tsakai
>>>>>>> bash-3.2#
>>>>>>> bash-3.2# ls -l
>>>>>>> total 8
>>>>>>> -rw-rw-r-- 1 tsakai tsakai 274 Feb 11 00:47 app.ac
>>>>>>> -rwxr-xr-x 1 tsakai tsakai 379 Feb 11 00:48 fib.R
>>>>>>> bash-3.2#
>>>>>>> bash-3.2# # now is the time for mpirun
>>>>>>> bash-3.2#
>>>>>>> bash-3.2# mpirun --app ./app.ac
>>>>>>> 13 ip-10-100-243-195
>>>>>>> 21 ip-10-100-243-195
>>>>>>> 5 ip-10-195-198-31
>>>>>>> 8 ip-10-195-198-31
>>>>>>> bash-3.2#
>>>>>>> bash-3.2# # It works (being root)!
>>>>>>> bash-3.2#
>>>>>>> bash-3.2# exit
>>>>>>> exit
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ # try it one more time as tsakai
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ mpirun --app app.ac
>>>>>>>
>>>>>>> ------------------------------------------------------------------------
>>>>>>> --
>>>>>>> mpirun was unable to launch the specified application as it encountered
>>>>>>> an
>>>>>>> error:
>>>>>>> Error: pipe function call failed when setting up I/O forwarding
>>>>>>> subsystem
>>>>>>> Node: ip-10-195-198-31
>>>>>>> while attempting to start process rank 0.
>>>>>>>
>>>>>>> ------------------------------------------------------------------------
>>>>>>> --
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ # I don't get it.
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$
>>>>>>> [tsakai_at_ip-10-195-198-31 ~]$ exit
>>>>>>> logout
>>>>>>> [tsakai_at_vixen ec2]$
>>>>>>> So, why does it say "pipe function call failed when setting up
>>>>>>> I/O forwarding subsystem Node: ip-10-195-198-31" ?
>>>>>>> The node it is referring to is not the remote machine. It is
>>>>>>> What I call machine A. I first thought maybe this is a problem
>>>>>>> With PATH variable. But I don't think so. I compared root's
>>>>>>> Path to that of tsaki's and made them identical and retried.
>>>>>>> I got the same behavior.
>>>>>>> If you could enlighten me why this is happening, I would really
>>>>>>> Appreciate it.
>>>>>>> Thank you.
>>>>>>> Tena
>>>>>>> On 2/10/11 4:12 PM, "Tena Sakai" <tsakai_at_[hidden]> wrote:
>>>>>>>> Hi jeff,
>>>>>>>>
>>>>>>>> Thanks for the firewall tip. I tried it while allowing all tip traffic
>>>>>>>> and got interesting and preplexing result. Here's what's interesting
>>>>>>>> (BTW, I got rid of "LogLevel DEBUG3" from ./ssh/config on this run):
>>>>>>>>
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ mpirun --app app.ac2
>>>>>>>> Host key verification failed.
>>>>>>>>
>>>>>>>>
>> ------------------------------------------------------------------------->>>>
>> >>
>> -
>>>>>>>> A daemon (pid 2743) died unexpectedly with status 255 while attempting
>>>>>>>> to launch so we are aborting.
>>>>>>>>
>>>>>>>> There may be more information reported by the environment (see above).
>>>>>>>>
>>>>>>>> This may be because the daemon was unable to find all the needed
>>>>>>>> shared
>>>>>>>> libraries on the remote node. You may set your LD_LIBRARY_PATH to have
>>>>>>>> the
>>>>>>>> location of the shared libraries on the remote nodes and this will
>>>>>>>> automatically be forwarded to the remote nodes.
>>>>>>>>
>>>>>>>>
>> ------------------------------------------------------------------------->>>>
>> >>
>> -
>>>>>>>>
>>>>>>>>
>> ------------------------------------------------------------------------->>>>
>> >>
>> -
>>>>>>>> mpirun noticed that the job aborted, but has no info as to the process
>>>>>>>> that caused that situation.
>>>>>>>>
>>>>>>>>
>> ------------------------------------------------------------------------->>>>
>> >>
>> -
>>>>>>>> mpirun: clean termination accomplished
>>>>>>>>
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ env | grep LD_LIB
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ # Let's set LD_LIBRARY_PATH to
>>>>>>>> /usr/local/lib
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ export LD_LIBRARY_PATH='/usr/local/lib'
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ # I better to this on machine B as well
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ ssh -i tsakai ip-10-195-171-159
>>>>>>>> Warning: Identity file tsakai not accessible: No such file or
>>>>>>>> directory.
>>>>>>>> Last login: Thu Feb 10 18:31:20 2011 from 10.203.21.132
>>>>>>>> [tsakai_at_ip-10-195-171-159 ~]$
>>>>>>>> [tsakai_at_ip-10-195-171-159 ~]$ export LD_LIBRARY_PATH='/usr/local/lib'
>>>>>>>> [tsakai_at_ip-10-195-171-159 ~]$
>>>>>>>> [tsakai_at_ip-10-195-171-159 ~]$ env | grep LD_LIB
>>>>>>>> LD_LIBRARY_PATH=/usr/local/lib
>>>>>>>> [tsakai_at_ip-10-195-171-159 ~]$
>>>>>>>> [tsakai_at_ip-10-195-171-159 ~]$ # OK, now go bak to machine A
>>>>>>>> [tsakai_at_ip-10-195-171-159 ~]$ exit
>>>>>>>> logout
>>>>>>>> Connection to ip-10-195-171-159 closed.
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ hostname
>>>>>>>> ip-10-203-21-132
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ # try mpirun again
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ mpirun --app app.ac2
>>>>>>>> Host key verification failed.
>>>>>>>>
>>>>>>>>
>> ------------------------------------------------------------------------->>>>
>> >>
>> -
>>>>>>>> A daemon (pid 2789) died unexpectedly with status 255 while attempting
>>>>>>>> to launch so we are aborting.
>>>>>>>>
>>>>>>>> There may be more information reported by the environment (see above).
>>>>>>>>
>>>>>>>> This may be because the daemon was unable to find all the needed
>>>>>>>> shared
>>>>>>>> libraries on the remote node. You may set your LD_LIBRARY_PATH to have
>>>>>>>> the
>>>>>>>> location of the shared libraries on the remote nodes and this will
>>>>>>>> automatically be forwarded to the remote nodes.
>>>>>>>>
>>>>>>>>
>> ------------------------------------------------------------------------->>>>
>> >>
>> -
>>>>>>>>
>>>>>>>>
>> ------------------------------------------------------------------------->>>>
>> >>
>> -
>>>>>>>> mpirun noticed that the job aborted, but has no info as to the process
>>>>>>>> that caused that situation.
>>>>>>>>
>>>>>>>>
>> ------------------------------------------------------------------------->>>>
>> >>
>> -
>>>>>>>> mpirun: clean termination accomplished
>>>>>>>>
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ # I thought openmpi library was in
>>>>>>>> /usr/local/lib...
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ ll -t /usr/local/lib | less
>>>>>>>> total 16604
>>>>>>>> lrwxrwxrwx 1 root root 16 Feb 8 23:06 libfuse.so ->
>>>>>>>> libfuse.so.2.8.5
>>>>>>>> lrwxrwxrwx 1 root root 16 Feb 8 23:06 libfuse.so.2 ->
>>>>>>>> libfuse.so.2.8.5
>>>>>>>> lrwxrwxrwx 1 root root 25 Feb 8 23:06 libmca_common_sm.so ->
>>>>>>>> libmca_common_sm.so.1.0.0
>>>>>>>> lrwxrwxrwx 1 root root 25 Feb 8 23:06 libmca_common_sm.so.1 ->
>>>>>>>> libmca_common_sm.so.1.0.0
>>>>>>>> lrwxrwxrwx 1 root root 15 Feb 8 23:06 libmpi.so ->
>>>>>>>> libmpi.so.0.0.2
>>>>>>>> lrwxrwxrwx 1 root root 15 Feb 8 23:06 libmpi.so.0 ->
>>>>>>>> libmpi.so.0.0.2
>>>>>>>> lrwxrwxrwx 1 root root 19 Feb 8 23:06 libmpi_cxx.so ->
>>>>>>>> libmpi_cxx.so.0.0.1
>>>>>>>> lrwxrwxrwx 1 root root 19 Feb 8 23:06 libmpi_cxx.so.0 ->
>>>>>>>> libmpi_cxx.so.0.0.1
>>>>>>>> lrwxrwxrwx 1 root root 19 Feb 8 23:06 libmpi_f77.so ->
>>>>>>>> libmpi_f77.so.0.0.1
>>>>>>>> lrwxrwxrwx 1 root root 19 Feb 8 23:06 libmpi_f77.so.0 ->
>>>>>>>> libmpi_f77.so.0.0.1
>>>>>>>> lrwxrwxrwx 1 root root 19 Feb 8 23:06 libmpi_f90.so ->
>>>>>>>> libmpi_f90.so.0.0.1
>>>>>>>> lrwxrwxrwx 1 root root 19 Feb 8 23:06 libmpi_f90.so.0 ->
>>>>>>>> libmpi_f90.so.0.0.1
>>>>>>>> lrwxrwxrwx 1 root root 20 Feb 8 23:06 libopen-pal.so ->
>>>>>>>> libopen-pal.so.0.0.0
>>>>>>>> lrwxrwxrwx 1 root root 20 Feb 8 23:06 libopen-pal.so.0 ->
>>>>>>>> libopen-pal.so.0.0.0
>>>>>>>> lrwxrwxrwx 1 root root 20 Feb 8 23:06 libopen-rte.so ->
>>>>>>>> libopen-rte.so.0.0.0
>>>>>>>> lrwxrwxrwx 1 root root 20 Feb 8 23:06 libopen-rte.so.0 ->
>>>>>>>> libopen-rte.so.0.0.0
>>>>>>>> lrwxrwxrwx 1 root root 26 Feb 8 23:06 libopenmpi_malloc.so ->
>>>>>>>> libopenmpi_malloc.so.0.0.0
>>>>>>>> lrwxrwxrwx 1 root root 26 Feb 8 23:06 libopenmpi_malloc.so.0 ->
>>>>>>>> libopenmpi_malloc.so.0.0.0
>>>>>>>> lrwxrwxrwx 1 root root 20 Feb 8 23:06 libulockmgr.so ->
>>>>>>>> libulockmgr.so.1.0.1
>>>>>>>> lrwxrwxrwx 1 root root 20 Feb 8 23:06 libulockmgr.so.1 ->
>>>>>>>> libulockmgr.so.1.0.1
>>>>>>>> lrwxrwxrwx 1 root root 16 Feb 8 23:06 libxml2.so ->
>>>>>>>> libxml2.so.2.7.2
>>>>>>>> lrwxrwxrwx 1 root root 16 Feb 8 23:06 libxml2.so.2 ->
>>>>>>>> libxml2.so.2.7.2
>>>>>>>> -rw-r--r-- 1 root root 385912 Jan 26 01:00 libvt.a
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$ # Now, I am really confused...
>>>>>>>> [tsakai_at_ip-10-203-21-132 ~]$
>>>>>>>>
>>>>>>>> Do you know why it's complaining about shared libraries?
>>>>>>>>
>>>>>>>> Thank you.
>>>>>>>>
>>>>>>>> Tena
>>>>>>>>
>>>>>>>>
>>>>>>>> On 2/10/11 1:05 PM, "Jeff Squyres" <jsquyres_at_[hidden]> wrote:
>>>>>>>>
>>>>>>>>> Your prior mails were about ssh issues, but this one sounds like you
>>>>>>>>> might
>>>>>>>>> have firewall issues.
>>>>>>>>>
>>>>>>>>> That is, the "orted" command attempts to open a TCP socket back to
>>>>>>>>> mpirun
>>>>>>>>> for
>>>>>>>>> various command and control reasons. If it is blocked from doing so
>>>>>>>>> by
>>>>>>>>> a
>>>>>>>>> firewall, Open MPI won't run. In general, you can either disable your
>>>>>>>>> firewall or you can setup a trust relationship for TCP connections
>>>>>>>>> within
>>>>>>>>> your
>>>>>>>>> cluster.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Feb 10, 2011, at 1:03 PM, Tena Sakai wrote:
>>>>>>>>>
>>>>>>>>>> Hi Reuti,
>>>>>>>>>>
>>>>>>>>>> Thanks for suggesting "LogLevel DEBUG3." I did so and complete
>>>>>>>>>> session is captured in the attached file.
>>>>>>>>>>
>>>>>>>>>> What I did is much similar to what I have done before: verify
>>>>>>>>>> that ssh works and then run mpirun command. In my a bit lengthy
>>>>>>>>>> session log, there are two responses from "LogLevel DEBUG3." First
>>>>>>>>>> from an scp invocation and then from mpirun invocation. They both
>>>>>>>>>> say
>>>>>>>>>> debug1: Authentication succeeded (publickey).
>>>>>>>>>>
>>>>>>>>>>> From mpirun invocation, I see a line:
>>>>>>>>>> debug1: Sending command: orted --daemonize -mca ess env -mca
>>>>>>>>>> orte_ess_jobid 3344891904 -mca orte_ess_vpid 1 -mca
>>>>>>>>>> orte_ess_num_procs
>>>>>>>>>> 2 --hnp-uri "3344891904.0;tcp://10.194.95.239:54256"
>>>>>>>>>> The IP address at the end of the line is indeed that of machine B.
>>>>>>>>>> After that there was hanging and I controlled-C out of it, which
>>>>>>>>>> gave me more lines. But the lines after
>>>>>>>>>> debug1: Sending command: orted bla bla bla
>>>>>>>>>> doesn't look good to me. But, in truth, I have no idea what they
>>>>>>>>>> mean.
>>>>>>>>>>
>>>>>>>>>> If you could shed some light, I would appreciate it very much.
>>>>>>>>>>
>>>>>>>>>> Regards,
>>>>>>>>>>
>>>>>>>>>> Tena
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On 2/10/11 10:57 AM, "Reuti" <reuti_at_[hidden]> wrote:
>>>>>>>>>>
>>>>>>>>>>> Hi,
>>>>>>>>>>>
>>>>>>>>>>> Am 10.02.2011 um 19:11 schrieb Tena Sakai:
>>>>>>>>>>>
>>>>>>>>>>>> your local machine is Linux like, but the execution hosts
>>>>>>>>>>>> are Macs? I saw the /Users/tsakai/... in your output.
>>>>>>>>>>>> No, my environment is entirely linux. The path to my home
>>>>>>>>>>>> directory on one host (blitzen) has been known as /Users/tsakai,
>>>>>>>>>>>> despite it is an nfs mount from vixen (which is known to
>>>>>>>>>>>> itself as /home/tsakai). For historical reasons, I have
>>>>>>>>>>>> chosen to give a symbolic link named /Users to vixen's /Home,
>>>>>>>>>>>> so that I can use consistent path for both vixen and blitzen.
>>>>>>>>>>> okay. Sometimes the protection of the home directory must be
>>>>>>>>>>> adjusted
>>>>>>>>>>> too,
>>>>>>>>>>> but
>>>>>>>>>>> as you can do it from the command line this shouldn't be an issue.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>> Is this a private cluster (or at least private interfaces)?
>>>>>>>>>>>> It would also be an option to use hostbased authentication,
>>>>>>>>>>>> which will avoid setting any known_hosts file or passphraseless
>>>>>>>>>>>> ssh-keys for each user.
>>>>>>>>>>>> No, it is not a private cluster. It is Amazon EC2. When I
>>>>>>>>>>>> Ssh from my local machine (vixen) I use its public interface,
>>>>>>>>>>>> but to address from one amazon cluster node to the other I
>>>>>>>>>>>> use nodes' private dns names: domU-12-31-39-07-35-21 and
>>>>>>>>>>>> domU-12-31-39-06-74-E2. Both public and private dns names
>>>>>>>>>>>> change from a launch to another. I am using passphrasesless
>>>>>>>>>>>> ssh-keys for authentication in all cases, i.e., from vixen to
>>>>>>>>>>>> Amazon node A, from amazon node A to amazon node B, and from
>>>>>>>>>>>> Amazon node B back to A. (Please see my initail post. There
>>>>>>>>>>>> is a session dialogue for this.) They all work without authen-
>>>>>>>>>>>> tication dialogue, except a brief initial dialogue:
>>>>>>>>>>>> The authenticity of host 'domu-xx-xx-xx-xx-xx-x (10.xx.xx.xx)'
>>>>>>>>>>>> can't be established.
>>>>>>>>>>>> RSA key fingerprint is
>>>>>>>>>>>> e3:ad:75:b1:a4:63:7f:0f:c4:0b:10:71:f3:2f:21:81.
>>>>>>>>>>>> Are you sure you want to continue connecting (yes/no)?
>>>>>>>>>>>> to which I say "yes."
>>>>>>>>>>>> But I am unclear with what you mean by "hostbased authentication"?
>>>>>>>>>>>> Doesn't that mean with password? If so, it is not an option.
>>>>>>>>>>> No. It's convenient inside a private cluster as it won't fill each
>>>>>>>>>>> users'
>>>>>>>>>>> known_hosts file and you don't need to create any ssh-keys. But when
>>>>>>>>>>> the
>>>>>>>>>>> hostname changes every time it might also create new hostkeys. It
>>>>>>>>>>> uses
>>>>>>>>>>> hostkeys (private and public), this way it works for all users. Just
>>>>>>>>>>> for
>>>>>>>>>>> reference:
>>>>>>>>>>>
>>>>>>>>>>> http://arc.liv.ac.uk/SGE/howto/hostbased-ssh.html
>>>>>>>>>>>
>>>>>>>>>>> You could look into it later.
>>>>>>>>>>>
>>>>>>>>>>> ==
>>>>>>>>>>>
>>>>>>>>>>> - Can you try to use a command when connecting from A to B? E.g. ssh
>>>>>>>>>>> `domU-12-31-39-06-74-E2 ls`. Is this working too?
>>>>>>>>>>>
>>>>>>>>>>> - What about putting:
>>>>>>>>>>>
>>>>>>>>>>> LogLevel DEBUG3
>>>>>>>>>>>
>>>>>>>>>>> In your ~/.ssh/config. Maybe we can see what he's trying to
>>>>>>>>>>> negotiate
>>>>>>>>>>> before
>>>>>>>>>>> it fails in verbose mode.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> -- Reuti
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>> Regards,
>>>>>>>>>>>>
>>>>>>>>>>>> Tena
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On 2/10/11 2:27 AM, "Reuti" <reuti_at_[hidden]> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> Hi,
>>>>>>>>>>>>
>>>>>>>>>>>> your local machine is Linux like, but the execution hosts are Macs?
>>>>>>>>>>>> I
>>>>>>>>>>>> saw
>>>>>>>>>>>> the
>>>>>>>>>>>> /Users/tsakai/... in your output.
>>>>>>>>>>>>
>>>>>>>>>>>> a) executing a command on them is also working, e.g.: ssh
>>>>>>>>>>>> domU-12-31-39-07-35-21 ls
>>>>>>>>>>>>
>>>>>>>>>>>> Am 10.02.2011 um 07:08 schrieb Tena Sakai:
>>>>>>>>>>>>
>>>>>>>>>>>> Hi,
>>>>>>>>>>>>
>>>>>>>>>>>> I have made a bit of progress(?)...
>>>>>>>>>>>> I made a config file in my .ssh directory on the cloud. It looks
>>>>>>>>>>>> like:
>>>>>>>>>>>> # machine A
>>>>>>>>>>>> Host domU-12-31-39-07-35-21.compute-1.internal
>>>>>>>>>>>> This is just an abbreviation or nickname above. To use the
>>>>>>>>>>>> specified
>>>>>>>>>>>> settings,
>>>>>>>>>>>> it's necessary to specify exactly this name. When the settings are
>>>>>>>>>>>> the
>>>>>>>>>>>> same
>>>>>>>>>>>> anyway for all machines, you can use:
>>>>>>>>>>>>
>>>>>>>>>>>> Host *
>>>>>>>>>>>> IdentityFile /home/tsakai/.ssh/tsakai
>>>>>>>>>>>> IdentitiesOnly yes
>>>>>>>>>>>> BatchMode yes
>>>>>>>>>>>>
>>>>>>>>>>>> instead.
>>>>>>>>>>>>
>>>>>>>>>>>> Is this a private cluster (or at least private interfaces)? It
>>>>>>>>>>>> would
>>>>>>>>>>>> also
>>>>>>>>>>>> be
>>>>>>>>>>>> an option to use hostbased authentication, which will avoid setting
>>>>>>>>>>>> any
>>>>>>>>>>>> known_hosts file or passphraseless ssh-keys for each user.
>>>>>>>>>>>>
>>>>>>>>>>>> -- Reuti
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> HostName domU-12-31-39-07-35-21
>>>>>>>>>>>> BatchMode yes
>>>>>>>>>>>> IdentityFile /home/tsakai/.ssh/tsakai
>>>>>>>>>>>> ChallengeResponseAuthentication no
>>>>>>>>>>>> IdentitiesOnly yes
>>>>>>>>>>>>
>>>>>>>>>>>> # machine B
>>>>>>>>>>>> Host domU-12-31-39-06-74-E2.compute-1.internal
>>>>>>>>>>>> HostName domU-12-31-39-06-74-E2
>>>>>>>>>>>> BatchMode yes
>>>>>>>>>>>> IdentityFile /home/tsakai/.ssh/tsakai
>>>>>>>>>>>> ChallengeResponseAuthentication no
>>>>>>>>>>>> IdentitiesOnly yes
>>>>>>>>>>>>
>>>>>>>>>>>> This file exists on both machine A and machine B.
>>>>>>>>>>>>
>>>>>>>>>>>> Now When I issue mpirun command as below:
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-06-74-E2 ~]$ mpirun -app app.ac2
>>>>>>>>>>>>
>>>>>>>>>>>> It hungs. I control-C out of it and I get:
>>>>>>>>>>>> mpirun: killing job...
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>> ------------------------------------------------------------------------
>>>>>>> ->
>>>>>>>>>
>>>>>>>> -
>>>>>>>>>>>> mpirun noticed that the job aborted, but has no info as to the
>>>>>>>>>>>> process
>>>>>>>>>>>> that caused that situation.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>> ------------------------------------------------------------------------
>>>>>>> ->
>>>>>>>>>
>>>>>>>> -
>>>>>>> ------------------------------------------------------------------------
>>>>>>> ->
>>>>>>>>>
>>>>>>>> -
>>>>>>>>>>>> mpirun was unable to cleanly terminate the daemons on the nodes
>>>>>>>>>>>> shown
>>>>>>>>>>>> below. Additional manual cleanup may be required - please refer to
>>>>>>>>>>>> the "orte-clean" tool for assistance.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>> ------------------------------------------------------------------------
>>>>>>> ->
>>>>>>>>>
>>>>>>>> -
>>>>>>>>>>>> domU-12-31-39-07-35-21.compute-1.internal - daemon did not
>>>>>>>>>>>> report
>>>>>>>>>>>> back when launched
>>>>>>>>>>>>
>>>>>>>>>>>> Am I making progress?
>>>>>>>>>>>>
>>>>>>>>>>>> Does this mean I am past authentication and something else is the
>>>>>>>>>>>> problem?
>>>>>>>>>>>> Does someone have an example .ssh/config file I can look at? There
>>>>>>>>>>>> are
>>>>>>>>>>>> so
>>>>>>>>>>>> many keyword-argument paris for this config file and I would like
>>>>>>>>>>>> to
>>>>>>>>>>>> look
>>>>>>>>>>>> at
>>>>>>>>>>>> some very basic one that works.
>>>>>>>>>>>>
>>>>>>>>>>>> Thank you.
>>>>>>>>>>>>
>>>>>>>>>>>> Tena Sakai
>>>>>>>>>>>> tsakai_at_[hidden]
>>>>>>>>>>>>
>>>>>>>>>>>> On 2/9/11 7:52 PM, "Tena Sakai" <tsakai_at_[hidden]> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> Hi
>>>>>>>>>>>>
>>>>>>>>>>>> I have an app.ac1 file like below:
>>>>>>>>>>>> [tsakai_at_vixen local]$ cat app.ac1
>>>>>>>>>>>> -H vixen.egcrc.org -np 1 Rscript
>>>>>>>>>>>> /Users/tsakai/Notes/R/parallel/Rmpi/local/fib.R 5
>>>>>>>>>>>> -H vixen.egcrc.org -np 1 Rscript
>>>>>>>>>>>> /Users/tsakai/Notes/R/parallel/Rmpi/local/fib.R 6
>>>>>>>>>>>> -H blitzen.egcrc.org -np 1 Rscript
>>>>>>>>>>>> /Users/tsakai/Notes/R/parallel/Rmpi/local/fib.R 7
>>>>>>>>>>>> -H blitzen.egcrc.org -np 1 Rscript
>>>>>>>>>>>> /Users/tsakai/Notes/R/parallel/Rmpi/local/fib.R 8
>>>>>>>>>>>>
>>>>>>>>>>>> The program I run is
>>>>>>>>>>>> Rscript /Users/tsakai/Notes/R/parallel/Rmpi/local/fib.R x
>>>>>>>>>>>> Where x is [5..8]. The machines vixen and blitzen each run 2 runs.
>>>>>>>>>>>>
>>>>>>>>>>>> Here¹s the program fib.R:
>>>>>>>>>>>> [ tsakai_at_vixen local]$ cat fib.R
>>>>>>>>>>>> # fib() computes, given index n, fibonacci number iteratively
>>>>>>>>>>>> # here's the first dozen sequence (indexed from 0..11)
>>>>>>>>>>>> # 1, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89
>>>>>>>>>>>>
>>>>>>>>>>>> fib <- function( n ) {
>>>>>>>>>>>> a <- 0
>>>>>>>>>>>> b <- 1
>>>>>>>>>>>> for ( i in 1:n ) {
>>>>>>>>>>>> t <- b
>>>>>>>>>>>> b <- a
>>>>>>>>>>>> a <- a + t
>>>>>>>>>>>> }
>>>>>>>>>>>> a
>>>>>>>>>>>>
>>>>>>>>>>>> arg <- commandArgs( TRUE )
>>>>>>>>>>>> myHost <- system( 'hostname', intern=TRUE )
>>>>>>>>>>>> cat( fib(arg), myHost, '\n' )
>>>>>>>>>>>>
>>>>>>>>>>>> It reads an argument from command line and produces a fibonacci
>>>>>>>>>>>> number
>>>>>>>>>>>> that
>>>>>>>>>>>> corresponds to that index, followed by the machine name. Pretty
>>>>>>>>>>>> simple
>>>>>>>>>>>> stuff.
>>>>>>>>>>>>
>>>>>>>>>>>> Here¹s the run output:
>>>>>>>>>>>> [tsakai_at_vixen local]$ mpirun -app app.ac1
>>>>>>>>>>>> 5 vixen.egcrc.org
>>>>>>>>>>>> 8 vixen.egcrc.org
>>>>>>>>>>>> 13 blitzen.egcrc.org
>>>>>>>>>>>> 21 blitzen.egcrc.org
>>>>>>>>>>>>
>>>>>>>>>>>> Which is exactly what I expect. So far so good.
>>>>>>>>>>>>
>>>>>>>>>>>> Now I want to run the same thing on cloud. I launch 2 instances of
>>>>>>>>>>>> the
>>>>>>>>>>>> same
>>>>>>>>>>>> virtual machine, to which I get to by:
>>>>>>>>>>>> [tsakai_at_vixen local]$ ssh ­A I ~/.ssh/tsakai
>>>>>>>>>>>> machine-instance-A-public-dns
>>>>>>>>>>>>
>>>>>>>>>>>> Now I am on machine A:
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$ # and I can go to machine B
>>>>>>>>>>>> without
>>>>>>>>>>>> password authentication,
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$ # i.e., use public/private key
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$ hostname
>>>>>>>>>>>> domU-12-31-39-00-D1-F2
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$ ssh -i .ssh/tsakai
>>>>>>>>>>>> domU-12-31-39-0C-C8-01
>>>>>>>>>>>> Last login: Wed Feb 9 20:51:48 2011 from 10.254.214.4
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-0C-C8-01 ~]$
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-0C-C8-01 ~]$ # I am now on machine B
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-0C-C8-01 ~]$ hostname
>>>>>>>>>>>> domU-12-31-39-0C-C8-01
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-0C-C8-01 ~]$
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-0C-C8-01 ~]$ # now show I can get to machine
>>>>>>>>>>>> A
>>>>>>>>>>>> without using password
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-0C-C8-01 ~]$
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-0C-C8-01 ~]$ ssh -i .ssh/tsakai
>>>>>>>>>>>> domU-12-31-39-00-D1-F2
>>>>>>>>>>>> The authenticity of host 'domu-12-31-39-00-d1-f2 (10.254.214.4)'
>>>>>>>>>>>> can't
>>>>>>>>>>>> be established.
>>>>>>>>>>>> RSA key fingerprint is
>>>>>>>>>>>> e3:ad:75:b1:a4:63:7f:0f:c4:0b:10:71:f3:2f:21:81.
>>>>>>>>>>>> Are you sure you want to continue connecting (yes/no)? yes
>>>>>>>>>>>> Warning: Permanently added 'domu-12-31-39-00-d1-f2' (RSA) to the
>>>>>>>>>>>> list
>>>>>>>>>>>> of
>>>>>>>>>>>> known hosts.
>>>>>>>>>>>> Last login: Wed Feb 9 20:49:34 2011 from 10.215.203.239
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$ hostname
>>>>>>>>>>>> domU-12-31-39-00-D1-F2
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$ exit
>>>>>>>>>>>> logout
>>>>>>>>>>>> Connection to domU-12-31-39-00-D1-F2 closed.
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-0C-C8-01 ~]$
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-0C-C8-01 ~]$ exit
>>>>>>>>>>>> logout
>>>>>>>>>>>> Connection to domU-12-31-39-0C-C8-01 closed.
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$ # back at machine A
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$ hostname
>>>>>>>>>>>> domU-12-31-39-00-D1-F2
>>>>>>>>>>>>
>>>>>>>>>>>> As you can see, neither machine uses password for authentication;
>>>>>>>>>>>> it
>>>>>>>>>>>> uses
>>>>>>>>>>>> public/private key pairs. There is no problem (that I can see) for
>>>>>>>>>>>> ssh
>>>>>>>>>>>> invocation
>>>>>>>>>>>> from one machine to the other. This is so because I have a copy of
>>>>>>>>>>>> public
>>>>>>>>>>>> key
>>>>>>>>>>>> and a copy of private key on each instance.
>>>>>>>>>>>>
>>>>>>>>>>>> The app.ac file is identical, except the node names:
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$ cat app.ac1
>>>>>>>>>>>> -H domU-12-31-39-00-D1-F2 -np 1 Rscript /home/tsakai/fib.R 5
>>>>>>>>>>>> -H domU-12-31-39-00-D1-F2 -np 1 Rscript /home/tsakai/fib.R 6
>>>>>>>>>>>> -H domU-12-31-39-0C-C8-01 -np 1 Rscript /home/tsakai/fib.R 7
>>>>>>>>>>>> -H domU-12-31-39-0C-C8-01 -np 1 Rscript /home/tsakai/fib.R 8
>>>>>>>>>>>>
>>>>>>>>>>>> Here¹s what happens with mpirun:
>>>>>>>>>>>>
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$ mpirun -app app.ac1
>>>>>>>>>>>> tsakai_at_domu-12-31-39-0c-c8-01's password:
>>>>>>>>>>>> Permission denied, please try again.
>>>>>>>>>>>> tsakai_at_domu-12-31-39-0c-c8-01's password: mpirun: killing job...
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>> ----------------------------------------------------------------------->
>>>>>>> >>
>>>>>>>>>
>>>>>>> -
>>>>>>>>>>>> --
>>>>>>>>>>>> mpirun noticed that the job aborted, but has no info as to the
>>>>>>>>>>>> process
>>>>>>>>>>>> that caused that situation.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>> ----------------------------------------------------------------------->
>>>>>>> >>
>>>>>>>>>
>>>>>>> -
>>>>>>>>>>>> --
>>>>>>>>>>>>
>>>>>>>>>>>> mpirun: clean termination accomplished
>>>>>>>>>>>>
>>>>>>>>>>>> [tsakai_at_domU-12-31-39-00-D1-F2 ~]$
>>>>>>>>>>>>
>>>>>>>>>>>> Mpirun (or somebody else?) asks me password, which I don¹t have.
>>>>>>>>>>>> I end up typing control-C.
>>>>>>>>>>>>
>>>>>>>>>>>> Here¹s my question:
>>>>>>>>>>>> How can I get past authentication by mpirun where there is no
>>>>>>>>>>>> password?
>>>>>>>>>>>>
>>>>>>>>>>>> I would appreciate your help/insight greatly.
>>>>>>>>>>>>
>>>>>>>>>>>> Thank you.
>>>>>>>>>>>>
>>>>>>>>>>>> Tena Sakai
>>>>>>>>>>>> tsakai_at_[hidden]
>>> _______________________________________________
>>> users mailing list
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>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>>
>>
>> _______________________________________________
>> users mailing list
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>
>
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