On Sun, Jan 19, 2003 at 02:18:16PM +0100, Ivo Marino wrote:
> I've setup apt-proxy server in my network, all Debian packages for each
> server in this network are downloaded from there.
>
> I think using a cron-job like cron-apt for updating security related
> packages automaticly on the servers not only could be a problem considering
> the securtiy point of view but also this could corrupt a server configuration
> and leave the system/service out of function.
>
> I prefer to launch manually a script which logs via ssh into each server
> and performs the packages update procedure.
>
> Anyone has allready written a script like the one described above or
> maybe knows an allready existing application which could perform this
> task? Thanks.
Here's a bash script I wrote that starts a given command on all workstations
at school (on Solaris):
#!/bin/bash
# copyright Peter Cordes 1999. License: GPL
# wscmd : run a given command on all workstations.
hostlist=~cordes/etc/wscmd.hosts
if [ 0 = $# ];then echo 'usage: wscmd args for rsh'; exit 1; fi
hosts=$(grep -v '^#' "$hostlist" | awk '{print $2}' )
for i in $hosts;do
# echo to keep output from a machine together
if ping $i 2|grep -v 'alive'; then continue;fi
echo "$i: $( ssh 2>&1 -n $i $@ )" &
~cordes/bin/usleep 100000
done
echo waiting for bg jobs 1>&2
jobs 1>&2
wait
Solaris ping is different from GNU/Linux ping, but fping is king.
You can probably just change the loop to for i in $( fping -a < $hosts )
and drop the if ...; continue.
usleep sleeps for x microseconds:
#include <stdio.h>
#include <unistd.h>
int main( int argc, char ** argv )
{
int us = atoi( argv[1] );
sleep( us );
return 0;
}
If you don't use usleep, you can end up with a huge number of ssh
connections open at once, and a huge number of processes running on the
machine you run wscmd on.
For using this script, it's probably easiest to specify a command that is a
shell script, instead of having a really complicated command as an argument
to wscmd. This is most convenient if you have a network filesystem set up,
but you could use wscmd to copy a shell script to every computer if you
wanted to.
--
#define X(x,y) x##y
Peter Cordes ; e-mail: X([EMAIL PROTECTED] , ns.ca)
"The gods confound the man who first found out how to distinguish the hours!
Confound him, too, who in this place set up a sundial, to cut and hack
my day so wretchedly into small pieces!" -- Plautus, 200 BC
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