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Friday February 04, 2005
Timeouts at 20 paces....
A quick bit of shell for checking if machines are alive..... I had to modify a script we use for running a benchmark yesterday to let us know if the client and database tiers had failed to come back up (there was a bit of re wiring work going on in the lab and we lost a rig without realising for a little while due to a disconnected cable). Anyway, a very simple piece of ksh was suffice, but just in case anyone needs something similar....
COUNT=0
SERVER_UP=0
function CheckServerUp {
SERVER=$1
COUNT_TIMEOUT=$2
while [ $SERVER_UP -eq 0 -a $COUNT -lt $COUNT_TIMEOUT ]
do
if [ `ping ${SERVER}| grep alive | wc -l` -eq 1 ]
then
SERVER_UP=1
echo "SERVER ${SERVER} is alive"
else
echo "Waiting on SERVER ${SERVER} to boot"
let COUNT=COUNT+1
sleep 60
fi
done
}
You just call it as
CheckServerUp yourServer no_of_times_to_try
i.e.
CheckServerUp myDB 20
And then just check against your SERVER_UP value to see if you need to do something.
(2005-02-03 22:31:07.0)
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