[LRUG] Sites drop off web

[Tim Harding]

Andy,

I had a similar problem with CentOS. mysqldump was stalling everything for a
couple of minutes when it ran.

Saw some pretty epic query times popping up in NewRelic RPM around that
time. The site just stalled for a few minutes.

Pingdom reported a minute or two of downtime.

-Tim

On 22 July 2011 11:25, Andrew Stewart <boss at airbladesoftware.com> wrote:

> Hola El Rug,
>
> I have several Rails/Sinatra sites on a couple of RHEL VPSs.  Almost every
> day for several months at least, almost all the sites drop off the web for
> 2-4 minutes.  I know this because Pingdom notifies me at 4.30am.
>
> As you can imagine, it's annoying.
>
> Initially I thought this was caused by Passenger log rotation but, when I
> looked into it this morning, I realised the times don't match up.  Here are
> some details:
>
> - Most sites go down most days.
> - The sites go down at 4.30am and are back up 2-4min later (Pingdom checks
> every minute).
> - The system cron runs its dailies, including logrotate, at 4.02am.
> - My crontab has nothing around 4.30am.
> - There's nothing in /var/log/cron around 4.30am.
> - There's nothing in the httpd error logs around 4.30am.
> - There's nothing in /var/log around 4.30am.
>
> Does anyone have any ideas?
>
> Thanks in advance,
>
> Andy Stewart
>
> -------
> http://airbladesoftware.com
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