Date: Thu, 4 Sep 2008 21:07:10 +0200 From: "Redd Vinylene" <reddvinylene@gmail.com> To: questions@freebsd.org Subject: Re: How to test the uptime of a webserver? Message-ID: <f1019d520809041207r300d496ak2993ee301da03463@mail.gmail.com> In-Reply-To: <f1019d520809041205t2bbbb9e5s3c076d813ad77dd0@mail.gmail.com> References: <f1019d520808301635q7a3407fcpe0c6f3115a70d02a@mail.gmail.com> <2620c3260808301722s673f70dkab7590f1ed9e48a4@mail.gmail.com> <f1019d520808310724q4ed30e35xd2c1b5ab1be4d14e@mail.gmail.com> <48BAB1C1.8020802@infracaninophile.co.uk> <f1019d520809041158i4597f634j11ec7a243657b422@mail.gmail.com> <f1019d520809041205t2bbbb9e5s3c076d813ad77dd0@mail.gmail.com>
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On Thu, Sep 4, 2008 at 9:05 PM, Redd Vinylene <reddvinylene@gmail.com>wrote: > On Thu, Sep 4, 2008 at 8:58 PM, Redd Vinylene <reddvinylene@gmail.com>wrote: > >> >> On Sun, Aug 31, 2008 at 4:59 PM, Matthew Seaman < >> m.seaman@infracaninophile.co.uk> wrote: >> >>> Redd Vinylene wrote: >>> >>>> On Sun, Aug 31, 2008 at 2:22 AM, Moises Castellanos <m2o7i1@gmail.com> >>>> wrote: >>>> >>>>> >>>>> On Sun, Aug 31, 2008 at 7:05 PM, Redd Vinylene <reddvinylene@gmail.com >>>>> > >>>>> wrote: >>>>> >>>> >>> 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 >>>>> know >>>>> 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. >>> >>> Cheers, >>> >>> Matthew >>> >>> [*] 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? >> >> -- >> http://www.home.no/reddvinylene >> > > I'll try to write a simple shell script and report back to y'all. > > -- > http://www.home.no/reddvinylene > Perfection is achieved, not when there's nothing left to add, but when there's nothing left to take away :) while sleep 555; do wget http://<ip>; -O /dev/null -t 1 || mail -s "<email>" <<< "Host is down"; done -- http://www.home.no/reddvinylene
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