Linux Administration

Linux is an operating system which was assembled under the model of free and open source software development and distribution. The main component of Linux is the Linux kernel, The first release of this Linux was done by Linus Torvalds in Oct 1991. It was originally developed as a free operating system for Intel x86-based personal computers but now it supports nearly all the computer hardware's. Mainly it is used on servers, mainframes, supercomputers but now a days it is being heavily used in mobile devices some of the examples are Maemo, MeeGo, Android etc. The development of Linux is one of the most prominent examples of free and open source software collaboration: the underlying source code may be used, modified, and distributed—commercially or non-commercially—by anyone under licenses such as the GNU General Public License. Some of the Linux flavors are: RHEL: Red Hat Enterprise Linux. Suse. Fedora. Mandriva. Debian. Ubuntu.... and many more. A Linux-based s...

If by any chance you are appearing for an interview for a position if Linux Administrator then the most common question which is asked is what is the difference between RHEL5 and RHEL6 ? Virtualization: In RHEL 6 KVM (Kernel based Virtual Machine) was used as a hypervisor but in the earlier releases of RHEL XEN was used as a hypervisor. The main advantage of KVM is that it supports the installation of many virtual machines/operating systems like Windows, Linux, Solaris and also it is very easy to manage those virtual machines. Security: RHEL6 has an enhanced version of SELinux(Security Enhanced Linux) now, Basically now the features are more improved and there are various new set of rules which are added to SELinux one of such rule/feature is of SVirt which provides security to virtual machines from hackers. EXT4: It stands for Extended 4, It has various new advantages then EXT2/3 which were used in earlier version(s) of RHEL. EXT4 is comparatively more faster and easy t...

RHEL stands for Red Hat Enterprise Linux, the current version of RHEL which is running successfully in Market is RHEL6. RHELis basically based on subscription basis where if you are a subscribed user then you will be benefited and can access all the supported versions of the operating system in binary as well as source form. Its first release was RHEL2.1 which was released in 2002. The major version of RHEL are released mostly in about 2-3 years but the minor ones are released nearly after every six months. Currently RHEL comes for: Servers. Desktops. If you are a subscribed user then you can get full support from Red Hat, you can access there knowledge base which you can access and can resolve your issue yourself and if by any chance you are unable to do that then you can always contact to Red Hat's Technical Support team for your queries.