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This blog sections are collected by me on the web or my own articles that eventually help some of you out there regarding to technolgy/business. Articles are informational purpose only. If you have any questions and concerns please email me at contact at paulpn.com
Linux Redhat/Feudora reference notes
Virtualization
Manually add route in Linux

192.168.80.0 /24 = your virtual machine  network
10.14.8.127 /22 = gateway - your next hop either PC or router

 route add -net 192.168.80.0[[ip network]] netmask 255.255.255.0[[subnet mask]] gw 10.14.8.127[[ip gateway]] metric 1 dev eth0

FSTAB corrupted - how to

Boot using Linux bootable CD/DVD
fdisk -l
mkdir /mnt/sysimage
mount /dev/sda# /mnt/sysimage/  (#=hard drive number)
cd /mnt/sysimage/
df - h (view the file system mounted)
restore the backup fstab file
reboot

Useradd / Groupadd

Usermod/Groupmod

Userdel/Groupdel

1) which useradd
2) rpm -qf /usr/sbin/useradd (qf=query file)
3) less /etc/login.defs
4) useradd user1
5) tail /etc/passwd (/etc/passwd=default user password file, /etc/shadow=the file is encrypted  only read by root) 

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10 things you should know about Hyper-V
Virtualization

Very good article from TechRepublic related to Microsoft Hyper-V

Hyper-V is getting good reviews, even from some Microsoft critics, and the release of the standalone version has made it even more attractive. Deb Shinder looks at the most important aspects of the Hyper-V platform.


Hypervisor technology is software on which multiple virtual machines can run, with the hypervisor layer controlling the hardware and allocating resources to each VM operating system. Hyper-V is the virtualization platform that is included in Windows Server 2008. Microsoft also recently released a standalone version, called Hyper-V Server 2008, that’s available as a free download from the Microsoft Web site.

As server virtualization becomes more important to businesses as a cost-saving and security solution, and as Hyper-V becomes a major player in the virtualization space, it’s important for IT pros to understand how the technology works and what they can and can’t do with it.

In this article, we address 10 things you need to know about Hyper-V if you’re considering deploying a virtualization solution in your network environment.

Note: This information is also available as a PDF download.

#1: To host or not to host?

Hyper-V is a “type 1″ or “native” hypervisor. That means it has direct access to the physical machine’s hardware. It differs from Virtual Server 2005, which is a “type 2″ or “hosted” virtualization product that has to run on top of a host operating system (e.g., Windows Server 2003) and doesn’t have direct access to the hardware.

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An Introduction to Hyper-V in Windows Server 2008
Virtualization
Virtualization
An Introduction to Hyper-V in Windows Server 2008
Rajiv Arunkundram
 
At a Glance:
  • What is virtualization?
  • Three virtualization architectures
  • Microkernelized vs. monolithic hypervisor
  • What Hyper-V does

There has been quite a lot of talk about virtualization recently, and most of the discussion is specifically about server virtualization. This is one of the most exciting trends in the industry and one that has the potential, over the next few years, to change the paradigm of how IT systems are deployed. But server virtualization will not only change how IT administrators and architects think about servers and system utilization, it is also going to affect the processes and tools used to manage what will certainly become an increasingly dynamic environment.
 
Virtualization has actually been around for some time now, but the technology is still evolving. In fact, the word itself still means different things to different people. In broad terms, however, virtualization is about abstracting one layer of the technology stack from the next layer, like storage from servers or the OS from the applications. Abstracting the different layers, in turn, enables consolidation and better manageability.

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Howto Create Operating System Base Image using HyperV/Vmware ESX
Virtualization

Setup OS Base Image:

1.  Install Operating System windows/linux
2.  HYPER V integration services and VMWARE tools
3.  Apply all OS updates
4.  Setup webserver (Windows IIS and ASP.net versions - Linux LAMP and enable SSH) and enable remote desktop/VNC
5.  Install Third Party Apps
6.  Copy Sysprep for older version of Windows and Windows 2008 has sysprep installed as a default
7.  Snapshot via Hypyer V and Vmware ESX
8.  Cloning virtual hard drives

Setup virtual networks (subnets):

1.  Subnet 10.10.10.0/24
2.  Subnet 10.10.20.0/24
3.  Subnet 10.10.30.0/24
4.  Subnet 10.10.40.0/24
5.  Subnet 10.10.50.0/24

Setup VLAN ID on Physical Switch

1.  VLAN10
2.  VLAN20
3.  VLAN30
4.  VLAN40
5.  VLAN50

 

 

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Networking Error, IP Address Already Assigned to Another Adapter
Troubleshooting

Under certain conditions, you may see the following error message from a Windows guest operating system:

Vmware Link

The IP address XXX.XXX.XXX.XXX you have entered for this network adapter is already assigned to another adapter Name of adapter. Name of adapter is hidden from the network and Dial-up Connections folder because it is not physically in the computer or is a legacy adapter that is not working. If the same address is assigned to both adapters and they become active, only one of them will use this address. This may result in incorrect system configuration. Do you want to enter a different IP address for this adapter in the list of IP addresses in the advanced dialog box?

In this message, XXX.XXX.XXX.XXX is an IP address that you are trying to set and Name of adapter is the name of a network adapter that is present in the registry but hidden in Device Manager.

This can occur when you change a network connection's TCP/IP configuration from DHCP to a static IP address if:

You have upgraded VMware virtual network adapters (for example when you migrate a virtual machine from an older to a
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Quotes on Determination
Job Hunting Tips
“Determination gives you the resolve to keep going in spite of the roadblocks that lay before you.” Denis Waitley

“Destiny is not a matter of chance, it is a matter of choice; it is not a thing to be waited for, it is a thing to be achieved.” William Jennings Bryan

“Confidence is the result of hours and days and weeks and years of constant work and dedication.” Roger Staubach

“Do whatever it takes, whenever it needs to be done, regardless of whether you feel like doing it or not.” Greg Hickman

 


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How to Answer “So, Tell me about yourself.”
Job Hunting Tips

Perhaps the most common, yet most difficult, interview question is “tell me about yourself.” When faced with this question, many job seekers don’t know where to start or how much to divulge.

Greg Rollett from the Orlando Employment Guide joins us on the Emurse blog for this guest post on the subject!

 

“So, Tell Me About Yourself.”

So your resume got you through the door. Good stuff. Glad to hear it, really.

Now that you are at the door, are you prepared to answer the question that takes most people down before they start? The question that is so relatively simple, yet vague and scary that it can single handily make or break your interview:

“So, Mr. (or Mrs.) Potential Employee, Tell me about yourself.”

Most interviewees go into the elevator pitch, 30 second sell or whatever hot term that basically describes yourself in less time than it takes to watch a super bowl commercial. This isn’t a bad route. The problem lies within the context of how you pitch yourself.

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Illegal Interview Questions
Job Hunting Tips

Illegal job interview questions are important to be aware of, whether you are conducting an interview or being interviewed. The general rule of thumb is that anything involving gender, age, religion, disabilities, marital status, sexual preference, ethnicity, and parental status are things to be avoided (especially here in the United States).

In addition to our article on standard interview questions, this article aims to help increase your awareness and ability to ace any interview thrown your way. Just because these questions are illegal, it doesn’t mean that they won’t be asked in an interview. After this primer, you’ll be aware of what you don’t have to answer.

 

What Makes an Interview Question Illegal?

For the most part, common social graces dictate the legality of an interview question. Any information that can be used for discriminatory practices would be defined as illegal. From the interviewers point of view, these questions should be avoided not only for their legality, but also for liability reasons (not to mention poor taste). From the interviewees perspective, know that you do not have to answer the question.

Keep in mind that most illegal questions are asked simply out of ignorance of the law. Outside of the workplace, many illegal job interview questions would seem like small talk. In our hyper-sensitive culture however, they can be used as proof of

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