Monitoring Tomcat with Munin on Debian GNU/Linux

To monitor Tomcat with Munin 2.0 on Debian GNU/Linux (tested on Debian Squeeze with Tomcat6 and Debian Backports), you need the following steps. First, you need to install package tomcat6-admin which enables the Tomcat Manager app we will be using….

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Firefox 15 PDF Reader preview

In Ubuntu, the shipped Firefox 15 comes with the new embedded HTML5 PDF reader disabled. It is easy to enable though. Go to “about:config”, search on “pdf” and switch the “pdfjs.disabled” entry to “false”. Restart Firefox and test it pointing…

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Munin 2.0 on Debian

Munin 2.0 has been released and packaged for Debian, and even backported to Squeeze (from backports.debian.org). Even though there are still some quirks in this version (or just the Debian packaging), it is far better (more scalable, more powerful and…

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HOWTO Build your own binaries of PHP Xapian bindings for Debian

Due to a licensing issue, the PHP bindings for Xapian were removed from Debian Squeeze. See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=513796 for more information about this. Though, it is not really hard to build your own package from source. Here is how: sudo apt-get…

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Adobe Flash and V4L2 webcams

Many new videoconference systems nowadays are Flash-based. Of course, the main input for them is some sort of video device (e.g. a webcam). Under Linux, the framework responsible for this is Video4Linux (V4L), of which version 2 (aka V4L2) is…

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HOWTO Rename Munin node without losing history

This howto describes how to rename a Munin 1.4.x node and/or move it to another domain without losing history, because just renaming the node in /etc/munin/munin.conf will actually just create a new host. It has been tested on Debian Squeeze…

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HOWTO Use gThumb to rename pictures in Ubuntu 10.10 (Maverick)

I’m used to gThumb to rename lots of pictures from camera’s filename to something including the date, hour taken and a sequence number, like this one: 2011-02-27–16.24.51_007.JPG. Basically, simply select pictures you want to rename and press F2 (or Edit->Rename)….

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HOWTO Install Sun’s JAVA on Ubuntu Lucid Lynx (10.04)

After Ubuntu’s decision to default to OpenJDK for 10.04 (which is a good decision, IMHO), Sun’s (but is it still Sun, or Oracle?) JAVA somewhat “disappeared” from Ubuntu (multiverse). That being said, some people may still need features only available…

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Using Intel ATOM as OpenSolaris NAS engine

I  recently started searching for a power- and price-efficient engine for modest-sized NAS, running OpenSolaris (Nexenta) of course. The idea to go to Intel ATOM first comes from their high power efficiency (1-13W TDP). To really benefit from it, do…

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Installing Squid on ZFS

The recommended filesystem for Squid on OpenSolaris is ZFS: http://wiki.squid-cache.org/BestOsForSquid It is also recommended to disable the atime property on the filesystem holding the cache, and you may want to avoid using any type of RAID. To achieve this on…

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