Unix provides a service called cron that runs programs repeatedly on a fixed schedule. Most experienced administrators consider cron to be vital to the system because it can perform automatic system maintenance.
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.
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
Find all Hidden Directories in my Linux Dedicated / Cloud Server
Log into SSH on your dedicated or cloud server.
Type:
# find / -name type d -name “.*” -print0
