Friday, July 3, 2020

Top 10 Dangerous Operations or Commands To Be Executed Carefully In Linux


I’ve come up with these 10 categories of tasks/commands/operations which would render a system un-usable or may cause service disruption or network outage when executed without proper precaution or understanding of the impact of the command and how it works. Most of these commands would also have a forceful execution option which doesn’t even raise a prompt before execution(when run by root or any privileged sudo user). This is in addition to the notorious recursive & forceful file removal command (rm -rf /). I’ve not considered the standard shutdown/reboot commands since these are known and understood by the command itself. Some of the commands would certainly require a root privilege, but the point here is that even as a root user, such commands should never be executed without understanding the details.

Monday, May 4, 2020

Lets Upgrade From RHEL7 To RHEL8


It has been quite some time since RHEL8 was released. Red Hat has officially announced the upgrade support from RHEL6 → RHEL7 & RHEL7 → RHEL8. This is with certain conditions and limitations. One has to read the complete document from Red Hat to understand the caveats about it. As per the official documentation from Red Hat, only Server variant is supported. So, let’s first understand certain important limitations before we could plan the upgrade. 

Monday, March 16, 2020

How to completely disable boot or startup messages?



Yes, there are situations where we’d get to see such requirements. So, a system should not show any boot or kernel or any messages whatsoever when booting and it should simply trigger/show the final GUI or CLI login screen. That is right. Sometimes it would be required to create such a system. In most recent versions of systemd based systems this could be achieved by nullifying systemd boot logs along with other options. Lets see how to get this done.

Saturday, January 18, 2020

How-To Safely Remove A Storage Device From A Linux System?

There are situations where we would be required to remove a storage device or LUN from a system and attach it to another system for some other important purpose. So, how could this be achieved? Yes, we could remove a storage device attached to a system safely provided the system has enough bandwidth to accommodate data on another available volume. In this blog page, I’ve tried to document all the steps with screen-shots to demonstrate the same procedure. I hope this helps someone and if so, please leave a comment or hit Like button. Thank you!


Monday, November 11, 2019

Learn Linux The SUSE Way




Yes, you heard it right. SUSE has been doing a good thing in enabling enterprise sector to be technically capable enough to cater to the needs. That’s right. SUSE has been conducting free technical training plus certifications to partner companies. They also would ready to go to the respective locations of the partner to deliver training's*.


This is significantly a different & great approach when compared with its competitors. Definitely, the company SUSE has been investing a lot on this approach. Anyone who is interested and wish to skill up would certainly could register for required course and start learning. There is also an option to learn online as well. 


Friday, August 23, 2019

Main Differences Between RHEL & SLES




Red Hat Enterprise Linux (RHEL)SUSE Linux Enterprise Server (SLES)
Owned ByRed Hat
Red Hat, Inc is an American MNC with head office in Raleigh, North Carolina (USA). It was founded in March 26th 1993. Now, it has been acquired by IBM.
SUSE
It is a German based software MNC, founded in 1992 and headquarter located at Nuremberg, Germany.