[LRUG] Finding out why server was unresponsive

[Gerhard Lazu]

This sounds like a networking issue to me. Was the server reporting to New
Relic? Was it reporting anything locally (ganglia, collectd, vnstat,
sysstat, ntop etc.)? If you don't want anything complicated, at least set
up vnstat & sysstat locally, they come in handy when troubleshooting these
kind of issues.

I've never used Hetzner, so I can't comment. I can personally recommend OVH
& Leaseweb, have pushed many hundreds of TBs over their networks without
any hiccups.

Gerhard

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On Tue, Apr 16, 2013 at 10:42 AM, Andrew Stewart
<boss at airbladesoftware.com>wrote:

> Good morning El Rug,
>
> Yesterday afternoon one of my servers stopped responding to HTTP and SSH.
>  I eventually got it back by executing a hardware reset via the host's
> (Hetzner) web GUI.  I have no idea what the problem was.
>
> The server runs Ubuntu 12.04 LTS.  It's been in production for a couple of
> months and hadn't had any downtime before yesterday.
>
> All the following logs were silent during the outage:
>
> - unicorn.std{out,err}.log
> - production.log
> - /var/log/kern.log
> - /var/log/syslog
> - /var/log/auth.log
> - /var/log/nginx/{access,error}.log
>
> I was running an mtr traceroute the whole time which showed packets making
> it into the host's network but failing to reach my server.
>
> New Relic shows nothing abnormal.  Memory use and CPU load were low as
> usual.
>
> I would dearly like to establish what happened so I can (try to) prevent
> it happening again...but I'm stumped.
>
> Any ideas?
>
> Many thanks in advance,
>
> Andy Stewart
> -------
> http://airbladesoftware.com
>
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