02-13-2008
How to receive results from processes spawned on external machines using SSH
I am trying to get the number of cpus on a farm of linux boxes (about 100 of them) by 'sshing' to each of them and checking their /proc/cpuinfo file.
So I have a local script localscript.sh on each of those 100 machines which retrieves the number of cpus in it by using its /proc/cpuinfo file. Then I have written a generic script on the master machine which gets these values from each of those machines by calling the local script on each of those machines by "sshing" to them as shown below within a for loop.
REMOTE_COMMAND=. /path/localscript.sh
/usr/bin/ssh -n username@machinename $REMOTE_COMMAND
It works fine. But is there a mechanism through which I could pass those values from each of those 100 machines back to the master machine process which is invoking the localscript on each of those 100 machines.
I need to use those "num cpu" values for some computational analysis within the main process on the master machine. How can the remote machines return their number of cpus back to the calling process running on the master machine ?
Your suggestions highly appreciated.
thanks
waavman
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LEARN ABOUT REDHAT
ssh-keysign
SSH-KEYSIGN(8) BSD System Manager's Manual SSH-KEYSIGN(8)
NAME
ssh-keysign -- ssh helper program for hostbased authentication
SYNOPSIS
ssh-keysign
DESCRIPTION
ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during hostbased authentication with
SSH protocol version 2.
ssh-keysign is disabled by default and can only be enabled in the the global client configuration file /etc/ssh/ssh_config by setting
HostbasedAuthentication to ``yes''.
ssh-keysign is not intended to be invoked by the user, but from ssh(1). See ssh(1) and sshd(8) for more information about hostbased authen-
tication.
FILES
/etc/ssh/ssh_config
Controls whether ssh-keysign is enabled.
/etc/ssh/ssh_host_dsa_key, /etc/ssh/ssh_host_rsa_key
These files contain the private parts of the host keys used to generate the digital signature. They should be owned by root, read-
able only by root, and not accessible to others. Since they are readable only by root, ssh-keysign must be set-uid root if hostbased
authentication is used.
SEE ALSO
ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)
AUTHORS
Markus Friedl <markus@openbsd.org>
HISTORY
ssh-keysign first appeared in OpenBSD 3.2.
BSD
May 24, 2002 BSD