[Xymon] best way to check amazon ec2 instance's availability

[deepak deore]

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 <jlaidman at rebel-it.com.au>wrote:

> On Nov 1, 2013 10:50 PM, "deepak deore" <deepakdeore2004 at gmail.com> 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
>
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