On Nov 24, 2011, at 2:00 AM, Reuti wrote: > 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 >> u...@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 > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
