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Full Discussion: script hangs when a remote server is down
Top Forums Shell Programming and Scripting script hangs when a remote server is down Post 302143834 by bakunin on Sunday 4th of November 2007 01:36:32 PM
Old 11-04-2007
Do you know how long the commands on the remote machine will approximately take? If so you could run the ssh-command in the background and then use sleep to let pass this time (plus some for contingency). If the command the still runs, you consider it to be hanging and kill it, if it has finished it is ok. You can use the "jobs" built-in ksh command to check the status of the job.

We suppose the commands you want to run remotely will take 20 seconds approximately. We add 10 seconds just to be sure and put the IP adress of the host to be contacted in a variable which is read in a loop :

Code:
.... < your script >....
cat list_of_ipadresses | while read ipadress ; do
     ssh  ssh $ipadress "<...commands ..>" &
     sleep 30
     jobs > /dev/null
     if [ $(jobs -p %s 2>/dev/null| wc -l) -ge 1 ] ; then
          print - "an error occurred contacting $ipadress
          kill %1
     else
          print - "success contacting $ipadress"
     fi
done
...

The first "jobs" statement is there to clear the display of all the "done"-messages if backgroup jobs already terminated during the sleep-statement.

bakunin
 

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LEARN ABOUT SUNOS

queuedefs

queuedefs(4)							   File Formats 						      queuedefs(4)

NAME

       queuedefs - queue description file for at, batch, and cron

SYNOPSIS

       /etc/cron.d/queuedefs

DESCRIPTION

       The queuedefs file describes the characteristics of the queues managed by cron(1M). Each non-comment line in this file describes one queue.
       The format of the lines are as follows:

	      q.[njobj][nicen][nwaitw]

       The fields in this line are:

       q	The name of the queue. a is the default queue for jobs started by at(1); b is the default queue for jobs  started  by  batch  (see
		at(1)); c is the default queue for jobs run from a crontab(1) file.

       njob	The  maximum  number of jobs that can be run simultaneously in that queue; if more than njob jobs are ready to run, only the first
		njob jobs will be run, and the others will be run as jobs that are currently running terminate.  The default value is  100.

       nice	The nice(1) value to give to all jobs in that queue that are not run with a user ID of super-user.  The default value is 2.

       nwait	The number of seconds to wait before rescheduling a job that was deferred because more than njob jobs were running in  that  job's
		queue, or because the system-wide limit of jobs executing has been reached.  The default value is 60.

       Lines beginning with # are comments, and are ignored.

EXAMPLES

       Example 1: A sample file.

       #
       #
       a.4j1n
       b.2j2n90w

       This  file  specifies that the a queue, for at jobs, can have up to 4 jobs running simultaneously; those jobs will be run with a nice value
       of 1.  As no nwait value was given, if a job cannot be run because too many other jobs are running cron will wait 60 seconds before  trying
       again to run it.

       The  b  queue, for batch(1) jobs, can have up to 2 jobs running simultaneously; those jobs will be run with a nice(1) value of 2.  If a job
       cannot be run because too many other jobs are running, cron(1M) will wait 90 seconds before trying again to run it. All	other  queues  can
       have up to 100 jobs running simultaneously; they will be run with a nice value of 2, and if a job cannot be run because too many other jobs
       are running cron will wait 60 seconds before trying again to run it.

FILES

       /etc/cron.d/queuedefs	       queue description file for  at, batch, and  cron.

SEE ALSO

       at(1), crontab(1), nice(1), cron(1M)

SunOS 5.10							    1 Mar 1994							      queuedefs(4)
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