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Full Discussion: Best way to connect to hundreds of nodes and grep log files
Top Forums Shell Programming and Scripting Best way to connect to hundreds of nodes and grep log files Post 302778383 by jim mcnamara on Sunday 10th of March 2013 09:58:39 PM
Old 03-10-2013
There is GNU parallel. It will run a series of commands for you at the same time. I do not recommend hundreds of ssh sessions at once. Keep it down to a reasonable limit.

GNU Parallel - GNU Project - Free Software Foundation

Modern shells also support a way to achieve this. bash example:

Code:
cnt=0
while read nodename
do
   cnt=$(( $cnt + 1 ))
   ssh $nodename 'grep "warning" *log' > $nodename.log &
   [  $(( $cnt % 10 )) -eq  0 ] && wait
done < listofnodes.txt

This runs ten operations of the command at one time.
This User Gave Thanks to jim mcnamara For This Post:
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LEARN ABOUT CENTOS

gnutls_url_is_supported

gnutls_url_is_supported(3)					      gnutls						gnutls_url_is_supported(3)

NAME

       gnutls_url_is_supported - API function

SYNOPSIS

       #include <gnutls/gnutls.h>

       int gnutls_url_is_supported(const char* url);

ARGUMENTS

       const char* url
		   A PKCS 11 url

DESCRIPTION

       Check whether url is supported.	Depending on the system libraries GnuTLS may support pkcs11 or tpmkey URLs.

RETURNS

       return non-zero if the given URL is supported, and zero if it is not known.

SINCE

       3.1.0

REPORTING BUGS

       Report bugs to <bug-gnutls@gnu.org>.
       General guidelines for reporting bugs: http://www.gnu.org/gethelp/
       GnuTLS home page: http://www.gnu.org/software/gnutls/

COPYRIGHT

       Copyright (C) 2012 Free Software Foundation, Inc..
       Copying	and  distribution  of  this file, with or without modification, are permitted in any medium without royalty provided the copyright
       notice and this notice are preserved.

SEE ALSO

       The full documentation for gnutls is maintained as a Texinfo manual.  If the info and gnutls programs are properly installed at your  site,
       the command

	      info gnutls

       should give you access to the complete manual.  As an alternative you may obtain the manual from:

	      http://www.gnu.org/software/gnutls/manual/

gnutls								      3.1.15						gnutls_url_is_supported(3)
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