hi erich
your version has the advantage that the hosts are rotated, so i can poll
much faster. initially i just wanted to ping one host and keep the others as
a reserve in case the first went offline. however this delays recovery, as
the following log shows: 8 minutes before network was up again.
so this brings up the next question, which is how to find reasonable delays
before restarting the network and waiting for the network to go up before
restarting it again.
thanks to all,
kiril
[root@bay network]# cat current | tai64nlocal
2002-05-28 18:59:03.520783500 starting connection monitor...
2002-05-30 15:15:34.888502500 www.bol.de is down, trying next host...
2002-05-30 15:17:34.918443500 www.db24.de is down, trying next host...
2002-05-30 15:19:34.948508500 www.redhat.com is down, trying next host...
2002-05-30 15:21:34.978430500 www.linux.org is down, trying next host...
2002-05-30 15:23:35.008522500 www.ibiblio.org is down, trying next host...
2002-05-30 15:23:35.029444500 network is down. restarting...
2002-05-30 15:23:36.652992500 Setting network parameters: [ OK ]
2002-05-30 15:23:36.851080500 Bringing up interface lo: [ OK ]
2002-05-30 15:23:37.756420500 Bringing up interface eth0: [ OK ]
2002-05-30 15:24:43.112993500 starting connection monitor...
-----Urspr�ngliche Nachricht-----
Von: Erich Titl <[EMAIL PROTECTED]>
An: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Datum: Mittwoch, 29. Mai 2002 15:41
Betreff: Re: [leaf-user] Detecting Disconnected Network
Hi Kiril
If I read your script correctly then there might be a little glitch
At 18:49 28.05.2002 -0700, you wrote:
>my last version of the script for pinging hosts follows. if there is a more
>elegant and reliable way to react in such rare situations, i will be glad
to
>hear it.
>
>regards,
>
>kiril
>
>
>
>#!bin/bash
>PING_REMOTE_HOSTS="host1.com host2.com host3.com"
>
>for HOST in $PING_REMOTE_HOSTS
>do
> UP=0
> while [ $UP -eq 0 ]
> do
> sleep 120
> ping $HOST -qc 1 >/dev/null 2>&1
> UP=$?
> done
> echo "$HOST is down, trying next host..."
>done
Once you have wasted all the hosts in your list you restart your network,
although IMHO this only means that host3.com cannot be pinged.
I believe you want to do something like
#!bin/bash
PING_REMOTE_HOSTS="host1.com host2.com host3.com"
UP=0
while true
do
while [$UP -eq 0]
do
sleep 120
UP = 1 # this would break the inner loop
for HOST in $PING_REMOTE_HOSTS
do
ping $HOST -qc 1 >/dev/null 2>&1
UP &= $? # if any ping returns 0 it is OK
done
done
echo "network is down. restarting..."
/etc/init.d/network reload
sleep 60
done
I have not tested this :-(
Erich
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