Hotlinking is the use of a linked object, often an image, from one site into a web page belonging to a second site. The second site is said to have an inline link to the site where the object is located.
It is always recommended to enable hotlinking of images, else …

Kernel 
 It makes sure that all processes in the system works fine
Rebuilding

It is done to optimize the kernel to suit our requirements as well as make it more secure from internet attacks
 Steps

1. Determining the current hardware 
 This is required during configuration process to enable hardwares that our new kernel has to support.
Commands …

To find the processor type and details
Get the Processor details:

cat /proc/cpuinfo

Find whether the processor is 32 or 64 bit:

 getconf LONG_BIT

Find the architecture:

uname -i

 Ping Requests use ICMP protocols. This is enabled/disabled using sysctl values.
To Disable Ping:
 
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all
 
To Enable Ping:
 
echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all

 Scenario
To log into “Server A” from “Server B” without using passwords. Users for both the server will be “root”
Process

 Login to “Server B” as root user and generate key for the root user. No need to enter any passphrase while generating this key.

ssh-keygen -t rsa
 
Once the key is generated, copy the …