Fix socket timeouts in Nagios

As any other monitoring system Nagios can produce false alarms. Usually it happens when Nagios fails to get the reply from the host being monitored during some pre-defined timeout. In order to mark service as down Nagios does three checks and if all of them are failed then the service is marked down and administrator will got an alert about its critical status. At the same time even if one […]

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Nfsen: Traffic Classification

Nfsen is open source sensor: it accepts netflow data from multiple netflow probes (servers, routers, vpn concentrators etc) and then visualizes it into human readable form. So using Nfsen you can see traffic statistics of every network device in your network in one place (actually Nfsen provides much more features). By default Nfsen makes it possible to see only inbound and outbound traffic statistics but no protocol breakdown or any traffic […]

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A Few Reasons to Love Ubuntu [Guest Post]

The term “Ubuntu” hails from South Africa and is defined as “humanity or kindness”… The meaning of this word is the whole philosophy behind the operating system named after it — Ubuntu. The company of Ubuntu believes that software should be available free of charge, that tools should be usable by people in their native language and despite any disabilities, and that users have the accessibility to customize and make […]

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Phone call as Nagios notification

Some time ago I found it pretty useful to configure Nagios monitoring system to send me a phone call in case of some critical problem. If some mission critical application goes down at night most probably you’ll miss an e-mail or sms notifying about that but won’t miss a telephone call to your cell phone. Honestly a telephone call is much more notorious rather than IM message notification or, again, […]

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Linus Torvalds -- The Facts You Didn't Know

Some of you may well be younger than Linux, some of you may have grown up with the OS, and some of you, more ancient ones, may well remember thinking that this stuff is going to ‘blow the bloody doors off’ as Michael Caine put it when you first encountered it. But how about Linus Torvald, the man who wrote the first kernel? Here we’re going to give you an […]

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