||Home||Switchboard||Unix Administration||Red Hat||TCP/IP Networks||Neoliberalism||Toxic Managers|
|(slightly skeptical) Educational society promoting "Back to basics" movement against IT overcomplexity and bastardization of classic Unix|
|News||Sysadmin Horror Stories||Recommended Links||Creative uses of rm||Mistakes made because of the differences between various Unix/Linux flavors||Missing backup horror stories||Lack of testing complex, potentially destructive, commands before execution of production box||Pure stupidity|
|Locking yourself out||Premature or misguided optimization||Reboot Blunders||Performing the operation on a wrong server||Executing command in a wrong directory||Side effects of performing operations on home or application directories||Typos in the commands with disastrous consequences||Side effects of patching|
|Multiple sysadmin working on the same box||Side effects of patching of the customized server||Ownership changing blunders||Dot-star-errors and regular expressions blunders||Excessive zeal in improving security of the system||Unintended consequences of automatic system maintenance scripts||LVM mishaps||Abuse of privileges|
|Safe-rm||Workaholism and Burnout||Coping with the toxic stress in IT environment||The Unix Haterís Handbook||Tips||Horror stories History||Humor||Etc|
Production servers usually have remote control device like DRAC or ILO so there are two network connection for the server.
This is very common problem, especially if you access the remote server infrequently. Often the time you need to access the server the password is already forgotten and the simplistic rule that you should not write down passwords blow up in your face. Generally, if regular passwords are used in the organization it is important to wear electronic watches with memo pad (such as Timex Men's Ironman Data Link USB Watch or Casio Databank watches ) that is capable of storing passwords. Cell phone also can be used unless you often forget it at home (I do). Sudo can (and should) be configured to provide opportunity for a wheel group to get to root.
Hosing Your Root Account
This was/is a common mistake on Solaris where the shell used for root is generally unusable for serious sysadmn work. Everybody and his brother are changing is either to bash to ksh. But errors in doing so lead to unintended consequences after the reboot :-).
Typically you get error messages like these:
login: root Password: Login incorrect
This is why using sudo is important. If wheel group is defined as equivalent to root and you are in this group you can fix the errors without typical tricks used for recovering root password or restoring access to root account.
Here is one recollection of this situation (From: [email protected] (John Ellithorpe), Massachusetts Institute of Technology
Here's a pretty bad story. I wanted to have root use tcsh instead of the Bourne shell. So I decided to copy tcsh to /usr/local/bin. I created the file, /etc/shells, and put in /usr/local/bin/tcsh, along with /bin/sh and /bin/csh.
All seems fine, so I used the chsh command and changed root's shell to /usr/local/bin/tcsh. So I logged out and tried to log back in. Only to find out that I couldn't get back in. Every time I tried to log in, I only got the statement: /usr/local/bin/tcsh: permission denied!
I instantly realized what I had done. I forgot to check that tcsh has execute privileges and I couldn't get in as root!
After about 30 minutes of getting mad at myself, I finally figured out to just bring the system down to single-user mode, which ONLY uses the /bin/sh, thankfully, and edited the password file back to /bin/sh.
I'll never do that again. This wasn't that much of a horror story, but good enough if you aren't that familiar with the system.
Oct 05, 2018 | www.reddit.com
Making some network changes in a core switch, use 'reload in 5' as I wasn't 100% certain the changes wouldn't kill my remote connection.
Changes go in, everything stays up, no apparent issues. Save changes, log out.
"All monitoring for customer is showing down except the edge firewalls".
... as soon as they said it I knew I forgot to cancel the reload.
0xD6 5 years ago
This one hit pretty close to home having spent the last month at a small Service Provider with some serious redundancy issues. We're working through them one by one, but there is one outage in particular that was caused by the same situation... Only the scope was pretty "large".
Performed change, was distracted by phone call. Had an SMS notifying me of problems with a legacy border that I had just performed my changes on. See my PuTTY terminal and my blood starts to run cold. "Reload requested by 0xd6".
...Fuck I'm thinking, but everything should be back soon, not much I can do now.
However, not only did our primary transit terminate on this legacy device, our old non-HSRP L3 gateways and BGP nail down routes for one of our /20s and a /24... So, because of my forgotten reload I withdrew the majority of our network from all peers and the internet at large.
That was a fun day.... What's worse is I was following a change plan, I just missed the "reload cancel". Stupid, stupid, stupid, stupid.
Google matched content
Groupthink : Two Party System as Polyarchy : Corruption of Regulators : Bureaucracies : Understanding Micromanagers and Control Freaks : Toxic Managers : Harvard Mafia : Diplomatic Communication : Surviving a Bad Performance Review : Insufficient Retirement Funds as Immanent Problem of Neoliberal Regime : PseudoScience : Who Rules America : Neoliberalism : The Iron Law of Oligarchy : Libertarian Philosophy
War and Peace : Skeptical Finance : John Kenneth Galbraith :Talleyrand : Oscar Wilde : Otto Von Bismarck : Keynes : George Carlin : Skeptics : Propaganda : SE quotes : Language Design and Programming Quotes : Random IT-related quotes : Somerset Maugham : Marcus Aurelius : Kurt Vonnegut : Eric Hoffer : Winston Churchill : Napoleon Bonaparte : Ambrose Bierce : Bernard Shaw : Mark Twain Quotes
Vol 25, No.12 (December, 2013) Rational Fools vs. Efficient Crooks The efficient markets hypothesis : Political Skeptic Bulletin, 2013 : Unemployment Bulletin, 2010 : Vol 23, No.10 (October, 2011) An observation about corporate security departments : Slightly Skeptical Euromaydan Chronicles, June 2014 : Greenspan legacy bulletin, 2008 : Vol 25, No.10 (October, 2013) Cryptolocker Trojan (Win32/Crilock.A) : Vol 25, No.08 (August, 2013) Cloud providers as intelligence collection hubs : Financial Humor Bulletin, 2010 : Inequality Bulletin, 2009 : Financial Humor Bulletin, 2008 : Copyleft Problems Bulletin, 2004 : Financial Humor Bulletin, 2011 : Energy Bulletin, 2010 : Malware Protection Bulletin, 2010 : Vol 26, No.1 (January, 2013) Object-Oriented Cult : Political Skeptic Bulletin, 2011 : Vol 23, No.11 (November, 2011) Softpanorama classification of sysadmin horror stories : Vol 25, No.05 (May, 2013) Corporate bullshit as a communication method : Vol 25, No.06 (June, 2013) A Note on the Relationship of Brooks Law and Conway Law
Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds : Larry Wall : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOS : Programming Languages History : PL/1 : Simula 67 : C : History of GCC development : Scripting Languages : Perl history : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history
The Peter Principle : Parkinson Law : 1984 : The Mythical Man-Month : How to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Haterís Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite
Most popular humor pages:
Manifest of the Softpanorama IT Slacker Society : Ten Commandments of the IT Slackers Society : Computer Humor Collection : BSD Logo Story : The Cuckoo's Egg : IT Slang : C++ Humor : ARE YOU A BBS ADDICT? : The Perl Purity Test : Object oriented programmers of all nations : Financial Humor : Financial Humor Bulletin, 2008 : Financial Humor Bulletin, 2010 : The Most Comprehensive Collection of Editor-related Humor : Programming Language Humor : Goldman Sachs related humor : Greenspan humor : C Humor : Scripting Humor : Real Programmers Humor : Web Humor : GPL-related Humor : OFM Humor : Politically Incorrect Humor : IDS Humor : "Linux Sucks" Humor : Russian Musical Humor : Best Russian Programmer Humor : Microsoft plans to buy Catholic Church : Richard Stallman Related Humor : Admin Humor : Perl-related Humor : Linus Torvalds Related humor : PseudoScience Related Humor : Networking Humor : Shell Humor : Financial Humor Bulletin, 2011 : Financial Humor Bulletin, 2012 : Financial Humor Bulletin, 2013 : Java Humor : Software Engineering Humor : Sun Solaris Related Humor : Education Humor : IBM Humor : Assembler-related Humor : VIM Humor : Computer Viruses Humor : Bright tomorrow is rescheduled to a day after tomorrow : Classic Computer Humor
The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D
Copyright © 1996-2021 by Softpanorama Society. www.softpanorama.org was initially created as a service to the (now defunct) UN Sustainable Development Networking Programme (SDNP) without any remuneration. This document is an industrial compilation designed and created exclusively for educational use and is distributed under the Softpanorama Content License. Original materials copyright belong to respective owners. Quotes are made for educational purposes only in compliance with the fair use doctrine.
FAIR USE NOTICE This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available to advance understanding of computer science, IT technology, economic, scientific, and social issues. We believe this constitutes a 'fair use' of any such copyrighted material as provided by section 107 of the US Copyright Law according to which such material can be distributed without profit exclusively for research and educational purposes.
This is a Spartan WHYFF (We Help You For Free) site written by people for whom English is not a native language. Grammar and spelling errors should be expected. The site contain some broken links as it develops like a living tree...
|You can use PayPal to to buy a cup of coffee for authors of this site|
Last modified: October 05, 2018