Latest Posts

Mininet Waiting for Network Configuration

I recently started taking the Udacity course on Computer Networking and while it looks like a good course it suffers from the same problem all the Udacity courses seem to suffer from: really badly put together examples and quizzes. It’s a shame because the material itself is generally of a really high quality. The problem I […]

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Using PuTTY for Key-Based SSH Login

If you are on Windows and need to “shell” into a Linux machine then PuTTY is the tool of choice. For password based logins it’s as simple as entering the IP address or name of the machine you want to connect to but for key based logins things get a little more complicated. This guide […]

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WobblyStack – A Single Node OpenStack Install

For a couple of years now I’ve run a small VMWare virtualization system for my business. Broadly speaking it’s gone well and been fairly uneventful. The only panic came when I transitioned from the free to the small business version of the software – I installed more memory than was allowed in the free version, […]

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ManagedBeanCreationException – What’s gone wrong now!

I recently failed to inject a managed bean into another bean that I was writing and for the life of me I couldn’t see what I’d done wrong. As is often the case it’s the little things that trip us up and in this case I was so used to doing it I couldn’t see […]

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Panasonic HC-V750 Metadata Files

I recently bought a Panasonic HC-V750 camcorder and I was intrigued by the additional files (.cont, pmpd and .tmb) it produces along with the video files – do they contain useful additional data?. A good googling didn’t turn up anything useful but a lot of people have wondered about them. 

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XMarks vs Chrome Means You Lose

Yah, I’ve just managed to lose all of my important bookmarks thanks to a fight between Chrome and XMarks. To be fair this is a known issue but it’s easy to accidentally cause the problem and the only loser in the whole mess is the end user.

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VirtualBox Additions on the Cloudera Training Machine

I was playing with the Cloudera training virtual machine (as supplied by the Intro to Hadoop and MapReduce course over on Coursera) today and I installed it into VirtualBox as suggested by the instructor notes. I must have hit every pot-hole on the way through though so I thought I’d document them here for anyone else […]

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Only detected a i686

One of the servers I manage is currently running Ubuntu 12.04 (Precise Pangolin) but in a little over a month 14.04 (Trusty Tahr) will be making an appearance. Now there’s no good reason for me to be rushing out an upgrading but it’s got to be done at some point so I thought I’d get […]

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UIInstructions cannot be cast

I f, like me, you are getting an error message along the lines of “UIInstructions cannot be cast to org.primefaces.model.menu.MenuElement” you are in luck because here’s the answer.

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