This has come up before - I would suggest doing a quick search of "ec2" on our user list. Here is one solution:
On Jun 14, 2011, at 10:50 AM, Barnet Wagman wrote: > I've put together a simple system for running OMPI on EC2 (Amazon's cloud > computing service). If you're interested, see > > http://norbl.com/ppe-ompi.html > > > Barnet Wagman On Nov 30, 2011, at 4:03 AM, Jaison Paul wrote: > > Ralph Castain <rhc <at> open-mpi.org> writes: > >> >> >> On Nov 24, 2011, at 2:00 AM, Reuti wrote: >> > > > Thanks a lot to Ralph and Reuti. > > Actually we are trying to use EC2 nodes as compute nodes and my local PC as > host > node. > > Happy to know that it is OK to use user<at>somehost.com > > We used that but failed. Would try again. > > Yes, we have set up .ssh file on remote EC2 hosts. Is there anything else that > we should be taking care of when dealing with EC2? > > Jaison > > >>> Hi, >>> >>> Am 24.11.2011 um 05:26 schrieb Jaison Paul: >>> >>>> I am trying to access OpenMPI processes over Internet using ssh and not > quite successful, yet. I believe >> that I should be able to do it. >>>> >>>> I have to run one process on my PC and the rest on a remote cluster over > internet. I have set the public keys >> (at .ssh/authorized_keys) to access remote nodes without a password. >>>> >>>> I use hostfile to run mpi. It will read something like: >>>> ----------------------------- >>>> localhost >>>> user <at> remotehost.com >>> >>> this is not a valid syntax for Open MPI. >> >> This isn't correct - we have long supported that syntax in a hostfile, and > there is no issue with having a >> different user name at each node. >> >> Jaison: are you sure your nodes are setup for password-less ssh? In other > words, have you setup your .ssh >> files on the remote nodes so they will allow us to ssh a process on them > without providing a password? This is >> the typical problem we see. >> >>> >>> >>>> ----------------------------- >>>> But it fails. >>>> >>>> The issue seems to be the user! That is, the user on my PC is different to > that of user at remotehosts. That's >> my assumption. >>>> >>>> Is this the problem? Is there any work-around to solve this issue? Do I > need to have same username at all >> nodes to solve this issue? >>> >>> You can define nicknames for an ssh connection in a file ~/.ssh/config like: >>> >>> Host foobar >>> User baz >>> Hostname the.remote.server.demo >>> Port 1234 >>> >>> While this will work with any nickname for an ssh connection, in your case > the nickname must match the one >> specified in the hostfile, as Open MPI won't use this lookup file: >>> >>> Host remotehost.com >>> User user >>> >>> ssh should then use the entries therein to initiate the connection. For > details you can have a look at `man ssh_config`. >>> >>> -- Reuti >>> _______________________________________________ >>> users mailing list >>> users <at> open-mpi.org >>> http://www.open-mpi.org/mailman/listinfo.cgi/users >> > > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
