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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 DEBIAN

ka-forwarder

KA-FORWARDER(8) 					       AFS Command Reference						   KA-FORWARDER(8)

NAME

       ka-forwarder - Forward AFS Authentication Server requests to another server

SYNOPSIS

       ka-forwarder [-p <port>] <server>[/<port>] [...]

DESCRIPTION

       ka-forwarder listens for requests for an AFS Authentication Server and forwards them to a remove fakeka server.	fakeka is a server that
       answers AFS Authentication Server protocol requests using a regular Kerberos KDC and is provided with some Kerberos 5 implementations.
       fakeka has to run on the same host as the Kerberos KDC, however, and AFS clients send all native AFS authentication requests to the AFS
       database servers.  If you don't want to run your Kerberos KDCs and your AFS database servers on the same host, run ka-forwarder on the AFS
       database servers and point it to fakeka running on the Kerberos KDCs.

       ka-forwarder takes one or more servers to which to forward the requests.  The default port on the remote server to which to forward the
       command is 7004, but a different port can be specified by following the server name with a slash ("/") and the port number.  If multiple
       servers are given, ka-forwarder will send queries to each server in turn in a round-robin fashion.

CAUTIONS

       Due to the way that ka-forwarder distinguishes from client requests and server responses, any messages from one of the servers to which ka-
       forwarder is forwarding will be considered a reply rather than a command and will not be forwarded.  This means that the servers running
       fakeka will not be able to use native AFS authentication requests and rely on ka-forwarder to send the requests to the right server.

       ka-forwarder does not background itself.  It should either be run in the background via the shell, or run via the Basic OverSeer Server
       (see bosserver(8)).

OPTIONS

       -p <port>
	   By default, ka-forwarder listens to the standard AFS Authentication Server port (7004).  To listen to a different port, specify it with
	   the -p option.

EXAMPLES

       Forward AFS Authentication Server requests to the fakeka servers on kdc1.example.com and kdc2.example.com:

	   % ka-forwarder kdc1.example.com kdc2.example.com &

       Note the "&" to tell the shell to run this command in the background.

PRIVILEGE REQUIRED

       ka-forwarder only has to listen to port 7004 and therefore does not require any special privileges unless a privileged port is specified
       with the -p option.

SEE ALSO

       bosserver(8), fakeka(8), kaserver(8)

COPYRIGHT

       Copyright 2006 Russ Allbery <rra@stanford.edu>

       This documentation is covered by the IBM Public License Version 1.0.  This man page was written by Russ Allbery for OpenAFS.

OpenAFS 							    2012-03-26							   KA-FORWARDER(8)
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