Linux in Supercomputers and Robotics

90% of the world's most powerful supercomputers using an operating system GNU / Linux, in fact, the top ten of supercomputers use Linux. In fact, the penetration of Linux in data centers is very high, 33.8% of the world runs on Linux servers compared to 7.3% does so in a Microsoft operating system. For example, Google's servers run on Linux, like the server hosting the website of the White House.

Linux Earlier Years

The first commercial distribution GNU / Linux was Yggdrasil was launched Lice-CD format in 1992. Red Hat was one of the first distributions to settle within companies and data centers in 1999. Debian was one of the first GNU / Linux that was constituted and organized as a community of developers.

Linux OS used in Major Applications / Services

Linux is present in highly critical applications such as Japan's bullet trains, traffic control, San Francisco, the New York Stock Exchange, CERN, many air traffic control systems or control of nuclear reactors of submarines and ships many nuclear war.

Expanding Everyday

Linux has more than 9.2 million lines of code and this amount grows 10% each year. Of the 9.2 million lines, the kernel itself accounts for 5% and 55% drivers. Add lines 4500, 1800 and 1500 are removed are changed every day.

Widely Used

Linux is now one of the most widely ported operating system kernels, running on a diverse range of systems from handheld computers to mainframe servers.

Thursday, May 30, 2013

[Solved] Unable to find a valid source directory. Please install the kernel headers for your operating system.

3:52 PM Unknown No comments

To fix the error " Unable to find a valid source directory. Please install the kernel headers for your operating system." Run the command below:
---------------------------------------------------------------
yum install kernel-header kernel-devel
---------------------------------------------------------------

SAMPLE OUTPUT:
-------------------------------------------------------------
 [~]# yum install kernel-header kernel-devel
Loaded plugins: fastestmirror, rhnplugin, security
Loading mirror speeds from cached hostfile
 * cloudlinux-x86_64-server-6: xmlrpc.cln.cloudlinux.com
Setting up Install Process
No package kernel-header available.
Resolving Dependencies
--> Running transaction check
---> Package kernel-devel.x86_64 0:2.6.32-379.22.1.lve1.2.17.1.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================================================================================================================
 Package                            Arch                         Version                                                 Repository                                        Size
================================================================================================================================================================================
Installing:
 kernel-devel                       x86_64                       2.6.32-379.22.1.lve1.2.17.1.el6                         cloudlinux-x86_64-server-6                       7.3 M

Transaction Summary
================================================================================================================================================================================
Install       1 Package(s)

Total download size: 7.3 M
Installed size: 0
Is this ok [y/N]: y
Downloading Packages:
kernel-devel-2.6.32-379.22.1.lve1.2.17.1.el6.x86_64.rpm                                                                                                  | 7.3 MB     00:00   
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : kernel-devel-2.6.32-379.22.1.lve1.2.17.1.el6.x86_64                                                                                                          1/1
  Verifying  : kernel-devel-2.6.32-379.22.1.lve1.2.17.1.el6.x86_64                                                                                                          1/1

Installed:
  kernel-devel.x86_64 0:2.6.32-379.22.1.lve1.2.17.1.el6                                                                                                                        
Complete!
------------------------------------------------------------- 
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