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Full Discussion: TCP port assignment
Top Forums Shell Programming and Scripting TCP port assignment Post 302415047 by timmylita on Wednesday 21st of April 2010 03:03:43 PM
Old 04-21-2010
TCP port assignment

I have multiple processes running the same program on my linux machine. For each process I want to be able to use a unique (available) TCP port. I have thought of using netstat to check which ports are available for use however, the time-window between checking and selecting might expose some race condition as other process might already snatch it... How can I accomplish this and avoid this situation in shell scripting?
 

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HOBBITD_CLIENT(8)					      System Manager's Manual						 HOBBITD_CLIENT(8)

NAME
hobbitd_client - hobbitd worker module for client data SYNOPSIS
hobbitd_channel --channel=client hobbitd_client [options] DESCRIPTION
hobbitd_client is a worker module for hobbitd, and as such it is normally run via the hobbitd_channel(8) program. It receives hobbitd client messages sent from systems that have the the Xymon client installed, and use the client data to generate the Xymon status messages for the cpu-, disk-, memory- and procs-columns. It also feeds Xymon data messages with the netstat- and vmstat-data collected by the client. When generating these status messages from the client data, hobbitd_client will use the configuration rules defined in the hobbit- clients.cfg(5) file to determine the color of each status message. OPTIONS
--clear-color=COLOR Define the color used when sending "msgs", "files" or "ports" reports and there are no rules to check for these statuses. The default is to show a "clear" status, but some people prefer to have it "green". If you would rather prefer not to see these status columns at all, then you can use the "--no-clear-msgs", "--no-clear-files" and "--no-clear-ports" options instead. --no-clear-msgs If there are no logfile checks, the "msgs" column will show a "clear" status. If you would rather avoid having a "msgs" column, this option causes hobbitd_client to not send in a clear "msgs" status. --no-clear-files If there are no file checks, the "files" column will show a "clear" status. If you would rather avoid having a "files" column, this option causes hobbitd_client to not send in a clear "files" status. --no-clear-ports If there are no port checks, the "ports" column will show a "clear" status. If you would rather avoid having a "ports" column, this option causes hobbitd_client to not send in a clear "ports" status. --no-ps-listing Normally the "procs" status message includes the full process-listing received from the client. If you prefer to just have the moni- tored processes shown, this option will turn off the full ps-listing. --no-port-listing Normally the "ports" status message includes the full netstat-listing received from the client. If you prefer to just have the moni- tored ports shown, this option will turn off the full netstat-listing. --config=FILENAME Sets the filename for the hobbit-clients.cfg file. The default value is "etc/hobbit-clients.cfg" below the Xymon server directory. --dump-config Dumps the configuration after parsing it. May be useful to track down problems with configuration file errors. --test Starts an interactive session where you can test the hobbit-clients.cfg configuration. --debug Enable debugging output. FILES
~xymon/server/etc/hobbit-clients.cfg SEE ALSO
hobbit-clients.cfg(5), hobbitd(8), hobbitd_channel(8), xymon(7) Xymon Version 4.2.3: 4 Feb 2009 HOBBITD_CLIENT(8)
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