[rt-users] possibly OT: RT's FCGI server randomly fails, no log

[Alex Hall]

Don't ask me why, but /var/log/messages recorded the problem this most
recent crash. Does this mean anything to anyone?


Oct 11 14:47:24 RTServer RT: [6632] Argument "myork" isn't numeric in
numeric ne (!=) at /usr/share/request-tracker4/lib/RT/Interface/Web.pm line
2949.
Oct 11 14:47:41 RTServer RT: [6632] Argument "myork" isn't numeric in
numeric ne (!=) at /usr/share/request-tracker4/lib/RT/Interface/Web.pm line
2949.

I didn't paste that twice, it appeared twice in the log. This is still
4.2.8.

On Tue, Oct 11, 2016 at 1:59 PM, Kenneth Marshall <ktm at rice.edu> wrote:

> On Tue, Oct 11, 2016 at 12:55:13PM -0400, Alex Hall wrote:
> > Hello list,
> > This may be off-topic, but I'm serving RT with Nginx and FCGI. Randomly,
> it
> > seems, the FCGI server is failing. Nginx works, but users see "error 502:
> > bad gateway". I see the same in the logs, with connect() failing. All I
> > have to do is run the spawn-fcgi command to get things back.
> >
> > Why this is happening, with some frequency, is the question. My Nginx,
> RT,
> > and system logs all show nothing, and to my knowledge, there are no FCGI
> > logs at all. The first error for today in Nginx is when a client failed
> to
> > connect after the server went down; there's nothing that says what the
> > actual problem was. This happened Saturday, then again today.
> >
> > The server has the latest updates for Debian 8.6, and has 4GB of ram.
> It's
> > serving a few dozen users at most, so the load can't be the problem. I'm
> > using Nginx 1.6.2 with four workers and 768 threads per worker. Users see
> > nothing unusual before this happens, just a 502 instead of the page they
> > expected.
> >
> > If anyone else is using Nginx and has ever seen this, I'd love some
> input.
> > As this could be considered off topic, feel free to respond directly to
> > ahall at autodist.com. If I need to provide more details, please let me
> know.
> > Thank you.
> >
> > --
> > Alex Hall
> > Automatic Distributors, IT department
> > ahall at autodist.com
>
>
> Hi Alex,
>
> You will get the 502 error when there are no more RT backends running. I
> tracked down verious errors in the RT logs that resulted in a backend
> exits. Most were of the 'cannot believe I did that type' by people
> setting up the system, i.e. not really fixable with a distributed
> management environment. We ended up using 'multiwatch' in RHEL6
> and systemd in RHEL7 to keep an appropriate number of backends always
> available.
>
> Regards,
> Ken
>



-- 
Alex Hall
Automatic Distributors, IT department
ahall at autodist.com
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