[mvapich-discuss] Needs firewall setting for MPI

[Jonathan Perkins]

On Sun, Jul 12, 2009 at 11:37:41PM -0500, Satoshi Isono wrote:
> Hello everyone,
> 
> Does anyone know FireWall configuration which allows MVAPICH code to
> run. Which port do I have to open? I am using mpirun_rsh based on SSH.
> Certainly, ssh command without password works.
> 
>    [craysp at t2k-0004 ~]$ ssh t2k-ps1 hostname
>    t2k-ps1
> 
>    [craysp at t2k-0004 ~]$ ssh t2k-ps2 hostname
>    t2k-ps2
> 
> t2k-0004 is login node, on where everyone launches mpirun_rsh command.
> For two nodes, t2k-ps1 and t2k-ps2 are actually compute nodes. When
> launching mpirun_rsh, but it fails with the following messages.
> 
>    gethostbyname: Host name lookup failure
>    
>    Child exited abnormally!
>    cleanupKilling remote processes...gethostbyname: Host name lookup
> failure
>    DONE
> 
> It seems resolving hostname is fail. Can you please advise me or point
> me checking files?

This seems to be more of an issue network configuration in resolving
names and seemingly not a firewall issue.

Snippet from manpage...

The function gethostname(2) is used to get the hostname.  Only when the
hostname -s is called will gethostbyname(3) be called.  The  difference
in gethostname(2) and gethostbyname(3) is that gethostbyname(3) is net-
work aware, so it consults  /etc/nsswitch.conf  and  /etc/host.conf  to
decide   whether  to  read  information  in  /etc/sysconfig/network  or
/etc/hosts the hostname is also  set  when  the  network  interface  is
brought up.

-- 
Jonathan Perkins
http://www.cse.ohio-state.edu/~perkinjo
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