How to Extend and Reduce Logical Volume

The biggest advantage of logical volume manager is that you can extend your logical volumes any time you are running out of the space. To increase the size of a logical volume by another 800 MB you can run this command:

1. How to Extend

# lvextend -L +800M/G <LV path>

The command above does not actually increase the physical size of volume, to do that you need to:

# resize2fs  <LV path>

The above method we use for online resizing and below is by unmounting.

How To Break Root Password in Linux

How To Break Root Password

Case I:--

If Bootloader don't have password or we know bootloader password

Key Points:--

1.    Select Redhat linux title and press E to edit

2.    Press E to edit kernel line

3.    then type 1 after giving single space

4.    Below Editing

5.    kernel /vmlinuz-2.6.32-71.el6.x86_64 ro ....................crashkernel=auto rhgb quiet

6.    After Editing

7.    kernel /vmlinuz-2.6.32-71.el6.x86_64 ro......................crashkernel=auto rhgb quiet 1

8.    Then Enter and boot by B

Linux and GNU

Linux and GNU

Although there are a large number of Linux implementations, you will find a lot of similarities in the different
distributions, if only because every Linux machine is a box with building blocks that you may put together
following your own needs and views. Installing the system is only the beginning of a longterm relationship.
Just when you think you have a nice running system, Linux will stimulate your imagination and creativeness,
and the more you realize what power the system can give you, the more you will try to redefine its limits.
Linux may appear different depending on the distribution, your hardware and personal taste, but the
fundamentals on which all graphical and other interfaces are built, remain the same. The Linux system is
based on GNU tools (Gnu's Not UNIX), which provide a set of standard ways to handle and use the system.

Properties of Linux

Linux Pros

A lot of the advantages of Linux are a consequence of Linux' origins, deeply rooted in UNIX, except for the
first advantage, of course:
Linux is free:
As in free beer, they say. If you want to spend absolutely nothing, you don't even have to pay the
price of a CD. Linux can be downloaded in its entirety from the Internet completely for free. No
registration fees, no costs per user, free updates, and freely available source code in case you want to
change the behavior of your system.