bh at bretthoerner.com
Tue Oct 16 20:03:25 UTC 2007
On Oct 16, 2007, at Oct16, 2:22:36PM, J Davis wrote:
> Is there any way to add additional tests so that, for instance, a
> nodes DB connectivity might be verified by checking the content of
> an http request?
I don't know of a way to do this through normal configuration or
plugins, but you could check out BackendHTTP.pm, the functions
event_write and event_read_waiting_options are the ones that
currently deal with the OPTIONS check. You could modify it hit a
specific URI with a GET, instead... and then check for some magical
"We're all good" in the headers, I guess. Keep in mind that the
OPTIONS check is currently when you first get a request (afaik), and
it's assumed to be very fast. If your DB check takes a while it
could block the first unlucky user's request... if I'm reading it
correctly. Just sort of stabbing here, I'm not a Perlbal pro. I'm
sure you're better off with the next option.
> If not, is this something that might be accomplished using a
> secondary app to monitor the nodes and update Perlbal on the fly?
Sure, your app (daemon or cron, whatever) could check your server for
connectivity then either ADD/REMOVE servers from a POOL via the
telnet management port, or change a nodelist file (which Perlbal will
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