[Xymon] Nginx - performance test?

[Jeremy Laidman]

Great work John.

Personally, I'm not interested an Nginx integration in particular, not
having any Nginx installs. But given the relative stability (staleness?) of
the Xymon codebase, I wonder if our focus should be on adding plugins
rather than trying to modify the core C code and seeking to have patches
accepted for a future release that may never happen.

As Xymon is relatively modular, it's usually not too difficult to hook into
various points in the system, to augment some parts of Xymon. In this case,
things are more complicated because I don't think there's a way to hook
into the xymonnet process. So the only solution is really to just have a
xymonnet-like probe that reports as if it were xymonnet - much like most
BB/Hobbit/Xymon add-ons do, including Erwan's perl script. The only problem
with this approach with xymonnet siblings is that it doesn't scale well -
particularly when written in Perl, because it has a heavy start-up overhead
(Python is likely much better in this regard). So plug-ins that are
persistent (sitting idle between each probes and looping) rather than
one-shot would tend to be more efficient, especially these days with
RAM being massively cheaper than in the olden days of BB/Hobbit.

J

On Mon, 27 Mar 2023 at 23:32, John Horne <john.horne at plymouth.ac.uk> wrote:

> On Mon, 2023-03-27 at 12:54 +1100, Brian Scott wrote:
> >
> > I used https://github.com/ZeWaren/xymon-nginx for a short while some
> > years ago. Seemed to work OK but my requirements changed and I've no
> > idea if it is still working. The code is still there on github.
> >
> Thanks for that. It's a little more than I wanted as all I really need is
> the
> total number of requests and let Xymon work out the number of requests per
> second. As it turns out, it is just a few lines of Perl and works well :-)
>
> I should perhaps add that I did also take a look at the Xymon code itself.
> Looking at the 'apache' test, it should be possible to cater for Nginx (I'm
> wary to say "relatively easily"!) The required URL changes from '/server-
> status?auto' for Apache to '/server-status' for Nginx. Secondly, the status
> output would need to be modified since obviously the output lines are
> different
> between Apache and Nginx. The rest of the code for the 'apache' test would
> then
> basically be the same for a new 'nginx' test. I haven't got time at the
> moment
> to code this and test, but we still have some other servers to move from
> Apache
> to Nginx, so I may have a bit more time then to look at modifying Xymon.
>
>
> John.
>
> >
> > On 22/3/2023 4:51 am, John Horne wrote:
> > > Hello,
> > >
> > > Does anyone have a test like the 'apache' performance test (as
> described in
> > > the hosts.cfg man page) but for Nginx?
> > >
> > >
> > > Thanks,
> > >
> > > John.
> > >
> > > --
> > > John Horne | Senior Operations Analyst | Technology and Information
> > > Services
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