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.

Monday, January 16, 2012

Installing Wordpress in Linux servers without control panels

10:18 AM Unknown No comments

Wordpress is a popular bloging tool and a famous CMS which uses mysql and php. Its most widely used because of its simplicity.

To instal wordpress in a linux server, follow the steps below:

1.Navigate to the Document root of the domain.
2. wget http://wordpress.org/latest.tar.gz
3. tar -xzvf wordpress-3.3.1.tar.gz
4. mv wordpress/* .
5. cp -p wp-config-sample.php wp-config.php
6. Open wp-config.php and give the DB info.
7. Open url : domainname/wp-login.php
8. Fill the details and click install wordpress.

Thats it. You have successfully installed wordpress :)
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Monday, January 9, 2012

Configure IP address in FreeBSD

10:36 AM Unknown No comments

FreeBSD is a free Unix-like operating system descended from AT&T UNIX via BSD UNIX.  Although for legal reasons FreeBSD cannot be called "UNIX", as the direct descendant of BSD UNIX (many of whose original developers became FreeBSD developers), FreeBSD's internals and system APIs are UNIX-compliant.
To set using command (temporarily)

ifconfig interface inet IP
eg: ifconfig lnc0 inet 192.168.1.2

lnc0 -->  interface name which can be obtained using ifconfig -a command

To set permanently
vi /etc/rc.conf
hostname="linux4starters.com"
ifconfig_lnc0="inet 192.168.0.3 netmask 255.255.255.0"





Run /etc/netstart script.
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Saturday, January 7, 2012

Configure Network Debian

5:28 PM Unknown No comments

Those who work in redhat flavour will find setting network in debian a bit tricky. Here is the simple and correct way of doing it.

Open the file: /etc/network/interfaces. This is the file where we can add single or muliple ips. I will show examples of how to do both and also to set via DHCP.

Setup interface to dhcp
auto eth0
iface eth0 inet dhcp

To add single IP
auto eth0
iface eth0 inet static
address 192.168.1.5
netmask 255.255.255.0
gateway 192.168.1.254

To add multiple ips
auto eth0 eth0:1 eth0:2 eth0:3 eth0:4
iface eth0 inet static
    address 74.120.246.194
        netmask 255.255.255.192
        gateway 74.120.246.193
iface eth0:1 inet static
        address 74.120.246.195
        netmask 255.255.255.192
        gateway 74.120.246.193
iface eth0:2 inet static
        address 74.120.246.196
        netmask 255.255.255.192
        gateway 74.120.246.193
iface eth0:3 inet static
        address 74.120.246.197
        netmask 255.255.255.192
        gateway 74.120.246.193
iface eth0:4 inet static
        address 74.120.246.198
        netmask 255.255.255.192
        gateway 74.120.246.193




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