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Fedora Linux – using Sound via Cron

Tuesday, April 17th, 2012

As a ‘logged in user’, playing a sound file (i.e. *.WAV or other audio file format) is really quite simple on Linux systems – you need: hardware that can generate sound output, one or more speakers connected to output ports, and software to read/render the auditory data. I have been using Fedora for several years Continue reading →

Getting git in 15 lines (more or less)

Thursday, December 8th, 2011

Figuring out how to use a new tool can be challenging – the notes below include some examples of my exploration with ‘git’. Note that Git is designed as a distributed version-ing system – you are the only one editing your LOCAL copy of the files and you share your changes when you ‘push’ them Continue reading →

Converting HTML to Markdown via Pandoc

Monday, November 28th, 2011

In the fall of 2011 the hosting for the Open Source Cobbler project (an automated system provisioning tool for bare metal or virtual machines) is transitioning to GitHub.Com from FedoraHosted.Org.    The (wiki) documentation for the project is available as HTML.  GitHub can support HTML but also provides support for Markdown (a ‘pure text’ means of providing Continue reading →

Linux GeoIP Firewall via iptables (using ipset)

Saturday, September 24th, 2011

In a previous post using GeoIP data with xtables-addons was discussed. CAVEAT – GeoIP data changes constantly – if you implement such a solution then make sure that you also add some sort of auto-data-update process.  Also, GeoIP filtering does not provide any guarantee that a system from ‘filtered IP space’ cannot access your resource Continue reading →

Using RRDs with Many Data Sources (rrdtool)

Monday, August 22nd, 2011

When reviewing rrdtool I found many examples showing ‘real time’ updates – but few examples for updating RRDs/RRAs (round robin databases/archives) with multiple data sources and/or source data that you might want to ‘migrate’ into an existing RRD.  A simple example: you have months, weeks or more historical temperature data that you want to include Continue reading →

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