How to test the uptime of a webserver?
reddvinylene at gmail.com
Thu Sep 4 18:58:23 UTC 2008
On Sun, Aug 31, 2008 at 4:59 PM, Matthew Seaman <
m.seaman at infracaninophile.co.uk> wrote:
> Redd Vinylene wrote:
>> On Sun, Aug 31, 2008 at 2:22 AM, Moises Castellanos <m2o7i1 at gmail.com>
>>> On Sun, Aug 31, 2008 at 7:05 PM, Redd Vinylene <reddvinylene at gmail.com>
> I got this dedicated server which is exposed to DDoS attacks quite
>>>> frequently. Say I need to host a website on it, is there any way of
>>>> telling how often it is actually online (to the rest of the world)?
>>>> Maybe make some sort of ping script from a remote server?
> You can install nagios and monitor the web server. It will send you an
>>> email when
>>> the server is down and when is up again. With this information you can
>>> the uptime
>>> of the web server.
> I'd have to install Nagios on a different server then, right? I doubt
>> the actual server knows when its ISP's link drops (or just slows down)
>> due to an attack.
> Not necessarily. You can install nagios on your web server and use it
> to monitor a server at the other end of your wan link -- usually a
> machine in your ISPs infrastructure[*] -- on the basis that if you can get
> packets out, then other people can get packets in. The trick is to monitor
> something that isn't too far away, or you'll end up monitoring the
> availability of other people's networks, rather than your own.
> There's a lot more can be done than just monitoring connectivity by
> sending ICMP ping packets every so often. There are any number of
> ways a web server can go wrong -- processes can crash, critical disk
> partitions can fill up, load spikes can overwhelm the machine's capacity.
> You can develop a range of different nagios tests that should tell you
> pretty much at a glance just what has gone wrong. Takes all the fun out
> of diagnosing the problems perhaps, but it does mean you'll be back to
> bed sooner when the pager goes off in the small hours.
> [*] Some ISPs provide machines specifically for this purpose.
> Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
> Flat 3
> PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
> Kent, CT11 9PW
Thank you guys. I'm looking for the simplest solution though, like a simple
oneliner, or a shell script.
Anybody have an idea?
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