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vagrant/ at master · mitchellh/vagrant · GitHub
Vagrant v1.1.0 introduced the version 2 Vagrant file format (which I used because I didn't know any better). And, as luck would have it, the Ubuntu 12.04 repositories only have Vagrant v1.0.1.
Vagrantfiles from 1.0.x that do not use any plugins are fully backwards compatible. If plugins are used, they must be removed prior to upgrading. The new plugin system in place will avoid this issue in the future.
Lots of changes introduced in the form of a new configuration version and format, but this is opt-in. Old Vagrantfile format continues to be supported, as promised. To use the new features that will be introduced throughout the 1.x series, you'll have to upgrade at some point.
vagrant  solution  breakingchanges  automation  devops 
september 2015
apache - Vagrant's port forwarding not working - Stack Overflow
I reprint Robert's comment below because it is such a trivial way to check: Run service iptables stop as root to quickly rule out a Guest firewall issue. Reenable it later if needed.
apache  virtualbox  portforwarding  iptables  firewall  centos  vagrant  devops  automation  ansible  solution 
september 2015
teaching - What is the point of a lecture when you have a textbook? - Academia Stack Exchange
Now let's say instead that you go to the same city but you hire a local guide that is very fluent in your language, or it could even be a friend that lived there for several years. With a few questions they will likely be able to figure out your interests, what you will find fascinating and what will just waste your time. They may even know of some hidden gems that, in the prior example, you got to towards the end of a day when you were totally exhausted, and you just didn't notice them, so you missed out.

Well, even an average lecturer, especially one that is actively involved in research in that field will be that tour guide in that subject. You will be more productive, you will learn more of the relevant information, and will allow you to skip the 300 pages of filler material that the publisher made the authors include to justify the $200 price tag on a new edition to a text whose prior edition was only two years before.

A great lecturer will get you to see how all of those facts are actually linked together in a consistent and coherent whole and will start you thinking about the material as an expert would. They can provide you with insights that will refocus the material and let you see it with new eyes. They can make you think about ideas and draw conclusions that you may never come to on your own...
education  lectures 
september 2015
SystemGroups - Debian Wiki
'staff' is also interesting; seems to allow writing to /usr/local.
adm: Group adm is used for system monitoring tasks. Members of this group can read many log files in /var/log, and can use xconsole. Historically, /var/log was /usr/adm (and later /var/adm), thus the name of the group.
debian  sysadmin  permissions  usermanagement  xconsole  logs  solution 
september 2015
NVIDIA CUDA Getting Started Guide for Linux - CUDA_Getting_Started_Linux.pdf
Installing Mesa may overwrite the /usr/lib/ that was previously installed by the NVIDIA driver, so a reinstallation of the NVIDIA driver might be required after installing these libraries.

Indeed. Other steps were necessary to build CUDA sample applications on elementary OS Luna (Ubuntu 12.04 Precise Pangolin). See:
solution  cuda  devel  documentation  reference  linux  ubuntu  elementary 
september 2015
Cuda 6.5 cannot find - libGLU. (On ubuntu 14.04 64 bit) - Stack Overflow
The solution for me was to reinstall the driver (one of the libmesa packages had left a dangling symlink behind, as predicted by the "Getting Started" guide) and modify the so that 'elementary os' was treated as 'ubuntu' when it came to looking for things like

I also had to create a symlink from /usr/lib/x86_64-linux-gnu -> /usr/lib/x86_64, because I think that extra "-linux-gnu" suffix is a peculiarity of Ubuntu/elementary OS that '' wasn't accounting for.
needshelp  cuda  linux  ubuntu  compilererrors  solution 
september 2015
linux - How can OpenGL graphics be displayed remotely using VNC? - Server Fault -
You may want to look at Virtual GL

Quote: "VirtualGL is an open source package which gives any Unix or Linux remote display software the ability to run OpenGL applications with full 3D hardware acceleration"

Should clarify that ʻvglrunʻ is required to make the "split rendering" magic happen. Just having VirtualGL available isnʻt enough.
cuda  virtualgl  vnc  solution  ish 
september 2015
VirtualGL - Hyades
But VirtualGL employs a technique called split rendering to force the 3D commands and data from the OpenGL application to go to the GPU (using vglrun):

$ vglrun glxinfo
virtualgl  gl  gpu  3dgraphics  cuda  solution  vnc 
september 2015
How to solve connection problems concerning Windows Update or Microsoft Update
I got a "0x8024402c" (WU_E_PT_WINHTTP_NAME_NOT_RESOLVED) and the solution was to delete a registry key (presumably put in place by domain/group policy) at HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate\AU, as explained here:
sysadmin  windowsupdate  windows  win7  troubleshooting  errormessage 
september 2015
Confreaks TV | The Unix Chainsaw - Cascadia Ruby 2011
Pipes, man!

* Primitives (strings, arrays, integers)
* Means of Combination (method calls)
* Means of Abstraction (classes, functions)

Screencast or pair programming.

Somebody's Bash shell answer to the techniques of this video:
git  shell  unix  sysadmin  commandline  video  tipsandtricks  humor 
september 2015
erichs/composure · GitHub
Ach so! 'typeset' is just an alias for 'declare'.
Retrieve your metadata later by calling 'metafor ()':

typeset -f foo | metafor about # displays:
perform mad script-foo
unix  shellscripting  repl  scripting  cli  bash  utility  software 
september 2015
dvorka/hstr · GitHub
Bash and zsh shell history suggest box - easily view, navigate, search and manage your command history.
bash  shell  cli  history  utility  software 
september 2015
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