setting a password less ssh connection
Seth Bardash
seth at integratedsolutions.org
Fri May 19 18:20:53 UTC 2006
> -----Original Message-----
> From: fedora-list-bounces at redhat.com
> [mailto:fedora-list-bounces at redhat.com] On Behalf Of Stephen
Mirowski
> Sent: Friday, May 19, 2006 12:12 PM
> To: For users of Fedora Core releases
> Subject: Re: setting a password less ssh connection
>
> hicham wrote:
> > Hello
> > I'm having trouble to set a passwordless ssh connection
> between many
> > pcs ,
SNIP....
Here is how we do it for clusters using MPI/MPICH:
This is part of a new application note that we are about to bring
on-line with our new web site.
This has not been edited. Therefore read it through and then use the
parts that you need.
----------------------------------------------------------------------
---------------------------------------------------------------
STEP 3: Configure SSH to connect without a password
----------------------------------------------------------------------
---------------------------------------------------------------
The mpd ring of MPICH2 runs by connecting to each machine via ssh. It
is required that each machine can connect to each other machine using
ssh without a password. In our experience, each machine must also be
able to connect to itself using ssh without a password. The following
steps are required.
1. > ssh-keygen -t rsa
When asked for a passphrase, leave it blank, press enter to
continue.
This will create 2 files in your $(HOME)/.ssh directory: id_rsa and
id_rsa.pub. They are the public and private rsa keys.
2. Rename the newly created id_rsa.pub to authorized_keys in the
$(HOME)/.ssh directory.
You should now be able to ssh into the local machine without having to
provide a password.
Run the above two commands on each machine in the cluster. Copy the
contents (not the actual file) of the id_rsa.pub file to the
authorized_keys file on the master (or first machine) you ran these
commands on. You should now have an authorized_keys file that
contains the key from each machine.
Copy this file to $(HOME)/.ssh to each node in the cluster. Every
node should now be able to ssh into every other node (including
itself) without prompting for a password.
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