Run the following command
Ls- l
And you will get an output
What is “crashkernel=X@Y” in /etc/grub.conf
“crashkernel=X@Y” is a kernel parameter for Kdump.
Kdump requires some memory reservation for the second kernel(capture kernel).
When kdump is enabled, (physical memory – X) will be allocated.
How to set up SquirrelMail in CentOS/RHEL
SquirrelMail is an open source standards-based webmail package written in PHP. When installed, SquirrelMail is ready out of the box. All it needs is an installed web server like Apache, SMTP server like Postfix, and IMAP server like Dovecot.
How to Install EPEL Repository in CentOS 5/6/RHEL
EPEL (Extra Packages for Enterprise Linux) is a third party RPM repository for Red Hat Enterprise Linux and CentOS.
Here are the steps to add the EPEL repository in Red Hat Enterprise Linux and CentOS 5 or 6:
How to skip or disable fsck on the next boot
To stop a FSCK from prompting or running automatically when rebooting server:
Bypass a fsck using shutdown command
When rebooting the server use the following command
OpenSSL Heartbleed Vulnerability
The bug afflicts version 1.0.1 and 1.0.2-beta releases of OpenSSL, server software that ships with many versions of Linux and is used in popular Web servers, according to the OpenSSL project’s advisory on Monday night.
Creating a Partition over 2tb on your Dedicated / Cloud Server
Log into SSH on your dedicated or cloud server.
Finding out device name and size of disk you going to work with, run the fdisk –l command.
# fdisk –l
Uninstall something in linux on my dedicated / cloud server
How to Uninstall Something in Linux on my Dedicated / Cloud Server
In the example below, we will uninstall apache.
Find out when a users last logged onto my Linux Dedicated / Cloud Server
Linux use the following two files to keep track of user login sessions:
a] /var/run/utmp – List of current login sessions.
b] /var/log/wtmp – List of previous login sessions.
c] /var/log/btmp – List all the bad login attempt.
How to Remove a folder and content in Linux
Log into SSH on your dedicated or cloud server.
You can simply run the rm –rf (directory) command.
# rm –rf foldername
