Great! will implement the solution to set the color to green if bastion
host is not available.
BTW .... all the hosts i m monitoring are inside amazon vpc and xymon is
outside of vpc. So xymon cant reach to the clients, it has to go through
bastion host, so i cant do the netcat to any clients other than bastion.
On Fri, Nov 1, 2013 at 8:44 PM, Jeremy Laidman <user-71895fb2e44c@xymon.invalid>wrote:
On Nov 1, 2013 10:50 PM, "deepak deore" <user-7b03b2a1ee70@xymon.invalid> wrote:
As ec2 instances by default doesn't respond icmp and I dont want to
enable icmp and ssh access to xymon server, what could be the best way to
check the instance's availability.
Can you attempt a connection on an unused port (eg 443 or 25) and see if
you get an "ICMP port unavailable" message indicated by a "connection
refused" result in netcat? That should be as effective as a ping.
Currently in my env i m doing following to check the availability:
1. Created server ext script which connects to bastion host and from
there it checks the ssh connection to the server.
ssh -n bastion_host "nc -w 5 -vz ec2_instance 22" 2>&1
if [ $? -eq 0 ]; then
COLOR=green
else
COLOR=red
fi
Perhaps if the ssh fails to connect to the bastion you can set the color
to "clear", and just make sure you bastion host is monitored.
J