Introduction
Bonding (or channel bonding) is a technology enabled by the Linux kernel and Red Hat Enterprise Linux, that allows administrators to combine two or more network interfaces to form a single, logical “bonded” interface
Telnet not obeying the per_source limit
Issue
We are trying to limit the telnet connection from any individual IP address to 10 in RHEL. However this is not working and it seems that each source can have unlimited connections. Our configuration is set to limit the connections, via the per_source value in /etc/xinetd.conf to 10 as shown below:
How to patch OpenSSL’s Heartbleed Vulnerability
How to patch OpenSSL’s Heartbleed Vulnerability
First you need to understand that not all version of OpenSSL are vulnerable.
Below are the version of OpenSSL that are affected by this bug.
Understanding Linux file Permissions
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 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.
