Hi,
We are deploying Linux HA on VMs. The problem is that we cannot use a serial
cable as a heartbeat communication link, and we have to totally depend on the
network. In case of network having connectivity issue, we will lose heartbeat
communication and brain split will happen.
To prevent this from happening, I decide to put a script called pinggate into
/etc/ha.d/haresources before the other resources:
------------------------------------------------------------------------
# cat pinggate
#!/bin/sh
gateway=10.0.0.1
case $1 in
start) if ! ping $gateway -c3; then
if ps -ef | grep -v grep | grep heartbeat; then
echo "shuting down heartbeat..."
ps -ef|grep heartbeat |grep -v grep
|awk '{print $2}' |xargs kill {};
fi
fi
ps -ef| grep -v grep |grep heartbeat || echo "hearbeat
is stopped."
;;
stop) true ;;
esac
exit 0;
---------------------------------------------------------------------------
what it does is when hb is lost, the slave will check if it can ping the
gateway before it starts other resources. If ping gateway fails, it will kill
heartbeat. Therefore, we make sure that brain split would not happen.
Please let me know if you see any problem in my logic.
By the way, does ipfail do the same thing? if I enable ipfail, will the slave
check pinging a gateway before starting up resources?
Thanks.
Hai Tao
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