[Labs-l] Debugging web service failure

Mon Apr 18 21:00:26 UTC 2016

Hi Morten,

The 503 suggests the web proxy hit a hitch -- the web server is running
on tools-webgrid-lighttpd-1415:37083 (qstat -xml, ssh to that host, ps aux
| grep suggestbot; vim /var/run/lighttpd/suggestbot.conf), but the proxy is
unaware of that.

I have restarted your webservice job (qmod -rj 5458226), and this seems to
have resolved the issue (https://tools.wmflabs.org/suggestbot/ now 404s,
but that's your lighttpd webservice and not the proxy).

Best,
Merlijn

On 18 April 2016 at 19:00, Morten Wang <nettrom at gmail.com> wrote:

> I'm currently having an issue with SuggestBot's (tools.suggestbot) web
> services failing after a while, resulting in a 503 (service unavailable).
> The web service process on the grid appears to be running, but it also
> appears to be unreachable.
>
> There is nothing in the error.log nor the access.log that suggests
> anything happened to lighttpd, and I am unsure about what debug settings to
> add to make it possible to log any errors. The fastcgi.debug setting
> doesn't appear to reveal anything. In other words, I've reached the end of
> my abilities to figure this out, and thus I wonder:
>
> What are some best practices when it comes to debugging what is going on?
>
>
> Cheers,
> Morten
>
>
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