There's a F/OSS app that uses SSH to execute the same command on
multiple machines, saving the admin the pain of doing the same thing on
each machine manually.
if you have ssh root keys setup then you could just do something like
#!/bin/bash
HOSTNAMES=`cat update-list.txt`
for i in $HOSTNAMES
do
ssh $i '/etc/init.d/ntpd stop && ntpdate ntp &&
/etc/init.d/ntpd start'
done
to run that task on many boxes quickly - you can do this for just about
anything
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