[mpich-discuss] credentials for mpiexec -f machinefile

[Jan Balewski]

On Apr 23, 2014, at 5:10 PM, "Antonio J. Peña" <apenya at mcs.anl.gov> wrote:

> No, what I meant was doing "ssh localhost", but now I look at your logs again, it may be a problem of your DNS configuration. 
> mpi-966f395e-bbb1-4a20-8cbc-c10081e91244 seems to be unable to resolve the IP address of mpi-be6bebee-55e3-4901-a5bb-637395ba46f6. Take a look at your /etc/hosts files in both hosts.
> 

Right, I just figured that out as well. When VM's are launched the get assigned this funny names, not matching the DNS names.
So I have manually adjusted the content of this 3 files  (I run on SL6.5)
 vi /etc/hostname
vi /etc/sysconfig/network
vi /etc/hosts

so the DNS name , public IP, and hostname --fqd  return the same info, e.g.

[cosy11 at oswrk210 mpich-3.1]$ hostname --fqd
oswrk210.lns.mit.edu

Now the command below  does not crashes  but hangs for many minutes, eventually time-outing.
So looks like I need to open port  60568 , right?
After I shut down fire wall on IP=210 it complain abut port   45895 
Next I shut down firewall in IP=207
and it complained abut new port  35167 

Finally I shut down firewall between VM (on the openStack controller) and … IT WORKED:

[cosy11 at oswrk210 mpich-3.1]$ mpiexec -f machinefile2 -n 4 ./examples/cpi
Process 0 of 4 is on oswrk210.lns.mit.edu
Process 3 of 4 is on oswrk207.lns.mit.edu
Process 1 of 4 is on oswrk210.lns.mit.edu
Process 2 of 4 is on oswrk207.lns.mit.edu
pi is approximately 3.1415926535899028, Error is 0.0000000000001097
wall clock time = 0.003602

QUESTION:
Can you tell me what ports I need to have open on the master & worker VMs for  mpiexec  to distribute work on them?

Jan


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