Hi,
We looked at this a bit more yesterday (I was having similar problems
to you) and we now have a more precise understanding of how ssh needs to be
setup to enable remote execution of jobs launched from X10DT.
There are two authentication domains that are relevant:
(a) accessing a "front-end" node on which the remote builds are
performed. For this, you can use a wide range of login mechanisms,
including ssh with password or public key (with or without passphrase).
This is the login information you are actually configuring in the x10
platform conf.
(b) accessing the "compute" nodes from the front-end node to
run a program. Here, the options are much more restricted if you want them
to work with X10DT and there is no UI to configure them. You need to have
"rsh-like" access from the front-end node to the back-end nodes. X10DT is
going to construct and run a command on the front-end node to launch the
execution on the compute nodes. If you use ssh to access the compute nodes
from the front-end node, you must use a public/private key pair for the
compute nodes that does not require a pass phrase, and the key pair must be
installed in the .ssh directory for your account on the front-end and
compute nodes (private key with a standard name like id_rsa or id_dsa in
the .ssh directory and the public key in the authorized keys file).
Basically, only if you can ssh or rsh from the front-end node to the
compute node without an ssh-agent and without typing anything
(password/passphrase), will it work for remote execution with X10DT.
There is a special case where the front-end node and the only
compute node are actually the same machine and the compute node is
specified in the platform configuration as localhost. Then the x10
launcher creates the processes simply by using fork instead of by using
ssh, so it is ok if your ssh key needs a passphrase, because it isn't
actually used when launching a program.
hope this helps,
-dave
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