#software Articles

  • 2019-07-18
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Taking puppet-ghostbuster for a spin

We use puppet at $dayjob to configure OpenStack. I wanted to know if there's a lot of unused code in our manifests! From left of stage enters: https://github.com/camptocamp/puppet-ghostbuster Step one is to install the puppet modules and gems and whatnot, this blog post was good about …

  • 2013-11-13
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commando.io - manage servers

https://command.io is up for public beta now. It is a page from where you can manage your servers online in a pretty web interface. It uses ssh - you need to allow commando.io's server to ssh into your server. You can specify with which user, which port and …

  • 2013-07-31
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SDN Course - Interview with Google Network Lead

This week in the SDN course on coursera there were lots of examples of real use of SDN stuff, for example like the B4 WAN by Google. They got a really interesting and cool interview with the Network Lead at Google - Amin Vahdat. And! They actually put this interview up …

  • 2013-07-17
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Make your own L2 Firewall!

Is what I did this week during the SDN Course on Coursera :) Within mininet or with a real OpenFlow capable switch, you can point the switch to use a controller. The controller would figure out all the smart stuff and the switch only does what the controller tells it to …

  • 2013-07-10
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SDN Course on Coursera-2

Halfway now, in week3, and just finished the first programming assignment in the course Software Defined Networking. Quite happy with the course so far, the quizzes are not too hard if you actually listen to the video lectures and after taking Coursera's "Learn to Program: Crafting Quality Code" the python …

  • 2013-07-07
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SDN course on coursera

Even though I'm on summer holiday I'd squeeze in time for a Software-Defined Networking course on coursera! https://www.coursera.org/course/sdn It's given by a professor from Georgia University. It's still not too late to register, it's only on the second week (until tomorrow Monday 8/7) and …

  • 2013-04-29
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Mininet - Software Defined Networking

Mininet Mininet is a network emulator written in Python. With it you can create a test network consisting of many devices, for example inside your laptop. It's a lot more light-weight compared to emulating switches/routers in GSN3. Initially Mininet appears to be more about easily getting working network rather …

  • 2012-11-03
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cfengine - what's that about?

http://cfengine.com/what-is-cfengine It's a (old) software that is used to make sure that (for example) the same config files are used on all machines. There are several other CMSs, for example puppet. Wikipedia has a nice overview of them. Let's use the lustre machines we set up in …

  • 2011-05-10
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HEPIX Spring 2011 – Day 5

What day it is can be told by all the suitcases around the room. Version Control An overview of the version control used in CERN. Quite cool, they're not using Git yet but they are moving away from CVS to SVN (subversion) which is not updated anymore. Apparently hard to …