[sysmon-help] spawn when a services comes backup

Jared Mauch jared at sysmon.org
Fri Dec 13 10:50:55 EST 2002

	This should be fairly simple to implement, the biggest concern I
have is that I hate calling external programs.  I keep what I consider
'delicate' track of the time that sysmon spends doing varying

	execute-on-down and execute-on-up could be easily done.

	(spawn would be alias to execute-on-down)

	i just don't want some external task to take forever
to run and cause the other tests to be all screwed up.


	- jared

On Fri, Dec 13, 2002 at 02:02:41PM +0000, Simon White wrote:
> 13-Dec-02 at 08:28, James T. Moore (jamoore2@vt.edu) wrote :
> > I would like to use sysmon to monitor the web sites
> > because the www monitoring option could be used
> > to check the web sites and report failure if the machine
> > is totally dead or is experiencing application failure
> > (i.e. an error page is returned that does not contain
> > the string sysmon is looking for).
> > 
> > When a failure is detected I would like to trigger a script
> > that removes the ip address of the failed server
> > from the dns record and adds an iptables rule 
> > to dnat all web traffic to the failed server over to one
> > of the working servers.
> > 
> > It would be nice if I could also trigger a rule to add
> > the failed ip back into the dns record and remove the
> > ip tables rule when the service comes backup.
> How about scripting this yourself with wget? wget can retrieve the page,
> use grep to check for the string, and then run failover if grep returns
> no match.
> Then, keep this running and if grep then shows a match, run another
> script.
> Sysmon could do this if it returned environment variables or something
> similar, so that you could see if the host is down or up.
> Otherwise, set sysmon output to a textfile and awk/grep for up or down
> so that you can do this.
> Several ways to skin this cat.
> Cheers,
> -- 
> |-Simon White, Internet Services Manager, Certified Check Point CCSA.
> |-MTDS  Internet, Security, Anti-Virus, Linux and Hosting Solutions.
> |-MTDS  14, rue du 16 novembre, Agdal, Rabat, Morocco.
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Jared Mauch  | pgp key available via finger from jared@puck.nether.net
clue++;      | http://puck.nether.net/~jared/  My statements are only mine.

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