[mpich-discuss] ssh-less MPI using docker exec?

[Balaji, Pavan]

Christian,

Supporting a new launcher is fairly trivial in Hydra (mpich's process manager).  You'd need to create something similar to 'ssh' in here: http://git.mpich.org/mpich.git/tree/HEAD:/src/pm/hydra/tools/bootstrap/external

In fact, based on a google search, I found this:

https://docs.docker.com/engine/reference/commandline/exec/

It looks like you can simply replace "ssh" with "docker exec" to get the required behavior?  If that is correct, can you try launching mpich this way:

% HYDRA_LAUNCHER_EXTRA_ARGS=exec mpiexec -hosts host1,host2 -launcher-exec 'docker' ./foo

  -- Pavan

> On Apr 3, 2016, at 4:56 AM, Christian Kniep <christian at qnib.org> wrote:
> 
> Hey Pavan,
> 
> I sparked a discussion on the github repo of Open MPI: https://github.com/open-mpi/ompi/issues/1511
> But I assume that a docker-native execution model would also do for MPICH.
> 
> Cheers
> Christian
> 
> On 3 April 2016 at 05:18:36, Balaji, Pavan (balaji at anl.gov) wrote:
> 
>> 
>> Did you mean to send this to the Open MPI mailing list? 
>> 
>> -- Pavan 
>> 
>> > On Mar 31, 2016, at 12:56 PM, Christian Kniep <christian at qnib.org> wrote: 
>> >  
>> > Hey there, 
>> >  
>> > I tinkered around with a ssh-less openmpi and I was wondering if it could be implemented in a nicer way. http://qnib.org/2016/03/31/dssh/ 
>> >  
>> > I just used -mca plm_rsh_agent /opt/qnib/src/dssh with a rather simple script to use docker exec: 
>> >  
>> > #!/bin/bash 
>> >  
>> > REMOTE_HOST=$1 
>> > shift 
>> > set -x 
>> > docker -H  
>> > unix:///var/run/docker.sock 
>> > exec -i -u ${USER} ${REMOTE_HOST} $@ 
>> >  
>> > Cheers Christian 
>> >  
>> >  
>> >  
>> >  
>> >  
>> >  
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