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Full Discussion: RSH: Running out of ports
Top Forums Shell Programming and Scripting RSH: Running out of ports Post 302708527 by nitrobass24 on Monday 1st of October 2012 05:37:51 PM
Old 10-01-2012
RSH: Running out of ports

I have an issue where I am running out of ports when using RSH to start a script remotely.

I have a script that i need to run that has been pushed out to every server. I have a list of servers (hostfilelist)

Basically, I have a simple loop that will run them in paralell.

Code:
for host in `cat hostfilelist`; do
rsh $host ksh script.ksh &
done

Problem is there are like 2k servers and I am hitting a limit of 512, (assuming port range is 512-1023 for RSH based on documents i have read).

How can i get around this? I am running RHEL5 fwiw.
 

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INSTALLSIEVE(1) 					      General Commands Manual						   INSTALLSIEVE(1)

 *

NAME
installsieve - user utility for managing sieve scripts SYNOPSIS
installsieve DESCRIPTION
installsieve is a utility that allows users to manage their sieve scripts kept on the server. OPTIONS
-v <name> View script with the given name. The script if retrieved sucessfully is output to standard output. -l List all of the scripts currently on the server. If one of the scripts is active a arrow is printed indicating that it is the active script. -p <port> Port to connect to. If left off this defaults to "sieve" as defined in /etc/services. -i <file> Install a file onto the server. If a script with the same name already exists on the server it is overwritten. Upon sucessfully putting the script on the server the script is set active. If <file> has the extension .script it is chopped when put on the server since sieve names may not contain a '.'. -a <name> Set <name> as the active script. The list of available names can be obtained from the '-l' option.. -d <name> Delete the sieve script on the server with <name>. -m <mechanism> Force installsieve to use <mechanism> for authentication. If not specified the strongest authentication mechanism is chosen. -g <name> Get the sieve script with <name> and save it to disk with a ".script" extension. If a file with that name already exists it is overwritten. -u <user> Userid/Authname to use for authentication; by default, the current user. CMU
Project Cyrus INSTALLSIEVE(1)
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