On Sep 30, 2009, at 7:02 PM, Jan-Henrik Haukeland wrote:
On 1. okt. 2009, at 02.58, Brady wrote:
if failed host localhost port 6000 protocol http and request '/
testing' hostheader 'example.com' with timeout 20 seconds for 2
cycles then restart
Just to clarify, this statement which you can write in Monit already
produce the same request as in your patch:
if failed host example.com port 6000 protocol http and request '/
testing' then restart
That works if you have a fairly simple server setup, but if you have
10 hosts sitting behind a CNAME then your suggested approach will not
do the right thing. It will connect to one of the 10 hosts, and if it
works then it will allow the local host to survive. Even worse, if
your service sites behind a globally load balanced pool then draining
traffic away from a location will disable all local protocol checking.
In our case we have several layers of front ends between the
resolvable host name, and the software we are monitoring. We monitor
the port/IP pair and try to wrap configuration such that monit's
requests make it through, but this patch allows us to just fetch the
host name we expect without any special cases in our software configs.
- Brady
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