Author: Davoud Teimouri

Re-Customize Existing Virtual Machine: Best Solution is PowerCLI Script! 0

How To

Re-Customize Existing Virtual Machine: Best Solution is PowerCLI Script!

What do you do if have to re-customize multiple virtual machines because of human mistake during creation or anything else? I had situation that I had to re-customize virtual machines and I couldn’t create virtual machines again. What Was Exact Problem? This was our scenario: Some virtual machines exported from a vCenter and we had to import them to another vCenter. As the machines MAC addresses had been changed after restoring them to another vCenter, the machines network configurations were incorrect. We didn’t have the machines root password and we couldn’t re-configure network configuration files in the machines manually. Re-Customize Existing Virtual Machine, is it possible? Answer is yes. vCenter allows you to re-customize existing virtual machines with information of “Customization Specification”. This feature is available for single virtual machine via virtual machine’s menu. You just need to have downtime for the virtual machine because virtual machine will be powered off and power-on to re-customization complete. What About Multiple Virtual Machines? Don’t worry about the same situation, if you had customized your machine by a “Customization Specification” in vCenter and you didn’t change other network configuration files such as hosts file and others, you can re-customize the machine without having...

Cert Invalid 20

Backup & Replication

Invalid Remote Certificate: How to Identify and Fix in Veeam BR 9.x or Newer

I faced with “Invalid remote certificate”: “Task Failed. Error: The remote certificate is invalid according to the validation process” on some my replication jobs between two our vCenter servers and Veeam BR couldn’t validate our target vCenter server certificate. I found a solution for resolving invalid remote certificate that I want to share it with you. Here is my environment specifications and the configuration. The log file locations maybe different with you environment: What Was “Invalid Remote Certificate” Issue? When vCenter server is adding to Veeam BR, its certificate’s thumbprint will be added to configuration database and if the vCenter server’s certificate was changed (Invalid remote certificate), you have to re-validate it in Backup Infrastructure. So if the certificate isn’t valid, you will see the below error: How Can Resolve It? First step, disable all your backup and replication jobs that they are related to the vCenter and also stop Veeam BR service because invalid remote certificate doesn’t allow you As I said before, you have to re-validate the certificate, so you should go to “Backup Infrastructure” and select your server then right click on the server and click on “Properties”. Then, you will face with the below dialog: Click...

Qubes OS – Part 2 0

Reviews

Qubes OS – Part 2

Qubes Architecture Overview We had talk about Qubes OS and now, I want to share dome information about its architecture. Qubes OS has wonderful architecture for delivering virtual applications in a secured and isolated environment to each user.

Create Your Custom Linux Distribution 0

Reviews

Create Your Custom Linux Distribution

Linux Kernel 4.6 has been released recently and many distributions have been created by some people around the world during past years. Most of new distributions had been created from one of older distribution source code. So if you want to do same and have your custom Linux with a updated kernel, Linux From Scratch will help you on this regard because you now that source codes are available for everyone. You can find good information about custom Linux creation such as Linux live CDs on the above link. I wanna create my custom Linux for virtualization by KVM during current year.

Replication Bandwidth Calculator 0

Free Tools

Replication Bandwidth Calculator

I want to introduce two tools for Veeam Backup & Replication sizing when your virtual machines are hosting by vSphere or Hyper-V: Replication Bandwidth Calculator The above link contains a desktop application for calculating replication bandwidth and replication time. Also there is an online calculator that you can find it on this link: Online Bandwidth Calculator [quotes_and_tips]

webmin 1

Free Tools / Reviews

Webmin – System Configuration Tool

Webmin is a web-based interface for administration tasks on Unix-like systems such as popular Linux distributions. Also recent version will be installed and run on Windows and just you need to install some prerequisites such as ActiveState Perl. You can setup user accounts, Apache, DNS, file sharing and much more. Webmin removes the need to manually edit Unix configuration files like /etc/passwd, and lets you manage a system from the console or remotely. See the standard modules page for a list of all the functions built into Webmin. This tool is very useful for remote administration and GUI deliver better experiences to administrators. You can download the proper version for your distribution form the Webmin web site and or install it from Webmin’s repository: Webmin Download Page

hv replica job re ip 2

Backup & Replication / Home Lab / How To / Operating System / Script

Re-IP Rule on Linux VM: Best Solution in Veeam Backup and Replication 7.x Version and Newer

Veeam Backup & Replication is one of the best backup and replication software that you can use them in your virtual environment. Veeam BR be able to IP customization during disaster-recovery and you can have your virtual machines in a DR site with different IP plan. But Veeam BR just support Windows VMs for IP customization or “Re-IP Rule”. So what can we do about Linux virtual machines and others?

Qubes OS – Part 1 0

Reviews

Qubes OS – Part 1

Security is very important to desktop users because they are working by some applications such as e-mail clients and their data is always threatened even if they are using anti-virus, firewall and other security software for providing better security but their data and application are not still isolated. First solution is using Sandbox software for isolating applications but if you are an user that you want to try Linux or you are migrating from Windows to VM and security is very important to you, you can install Qubes Linux on your desktop or laptop and use its app virtualization for isolating your applications and you will have maximum security even without anti-virus. Here is some information about Qubes OS form its web site: What is Qubes OS? Qubes is a security-oriented operating system (OS). The OS is the software which runs all the other programs on a computer. Some examples of popular OSes are Microsoft Windows, Mac OS X, Android, and iOS. Qubes is free and open-source software (FOSS). This means that everyone is free to use, copy, and change the software in any way. It also means that the source code is openly available so others can contribute to and...

server tuning 0

Reviews

Performance Tuning Guidelines for Windows Server 2012 R2

Microsoft has released a document for tuning Windows Server 2012 R2 and the document is including Hyper-V tuning recommendations. I suggest that download the document if you have Hyper-V in your virtualization farm. Here is the download link: Performance Tuning Guidelines for Windows Server 2012 R2  

what are containers 1 0

Reviews

Operating System-Level Virtualization

This is a concept that Linux administrators are familiar with that because it’s born in Unix-Like operating systems. That is not new technology, and this method is older than most of us. What is “Operating System-Level Virtualization”? This technology as an advanced implementation of the standard chroot mechanism. Operating-system-level virtualization is a server-virtualization method where the kernel of an operating system allows for multiple isolated user-space instances, instead of just one. Such instances, which are sometimes called containers and software containers. Operating-system-level virtualization is commonly used in virtual hosting environments, where it is useful for securely allocating finite hardware resources amongst a large number of mutually-distrusting users. System administrators may also use it, to a lesser extent, for consolidating server hardware by moving services on separate hosts into containers on the one server. Other typical scenarios include separating several applications to separate containers for improved security, hardware independence, and added resource management features. The improved security provided by the use of a chroot mechanism, however, is nowhere near ironclad. Operating-system-level virtualization implementations capable of live migration can also be used for dynamic load balancing of containers between nodes in a cluster. Operating-system-level virtualization usually imposes little to no overhead, because...

VMware Workstation Unity Mode 0

How To

VMware Workstation Unity Mode

I love this feature in VMware Workstation, you can run your application on a guest OS and use it same as native application on your host machine. You can switch virtual machines that have Windows XP or later guest operating systems to Unity mode to display applications directly on the host system desktop. In Unity mode, virtual machine applications appear on the host system desktop, you can use the virtual machine Start or Applications menu from the host system, and the virtual machine console view is hidden. Items for open virtual machine applications appear on the host system taskbar in the same way as open host applications. On host system and virtual machine applications that are displayed in Unity mode, you can use keyboard shortcuts to copy, cut, and paste images, plain text, formatted text, and email attachments between applications. You can also drag and drop and copy and paste files between the host system and the guest operating system. If you save a file or attempt to open a file from an application in Unity mode, the file system you see is the file system inside the virtual machine. You cannot open a file from the host operating system...

Network Virtualization For Dummies 0

Books

Network Virtualization For Dummies

If you want to know the future of network virtualization, you need to download this book. Go to the below link and download your free copy today: Network Virtualization For Dummies [quotes_and_tips]

True SSO Diagnostic Utility 0

Desktop Virtualization / Reviews

True SSO Diagnostic Utility

Another tools (Fling) has been released by VMware engineers and it’s useful same as other tools. Horizon True SSO has been introduced in VMware Horizon 7: Overview of True SSO True SSO provides a way to authenticate to Microsoft Windows, retaining all of the users’ normal domain privileges, without requiring them to provide AD credentials! True SSO is a VMware Horizon technology that integrates VMware Identity Manager 2.6 with Horizon 7. VMware Identity Manager Standard is included in VMware Horizon 7 Advanced and Enterprise Editions. With True SSO, a user can log into Identity Manager using any non-AD method (for example, RSA SecurID credentials) and once authenticated, the user is able to launch any entitled desktop or app (hosted from any domain) without ever being prompted for a password again! True SSO uses SAML (Security Assertion Markup Language) to send the User Principal Name (for example, [email protected]) to the identity provider’s authentication system to access AD credentials. Horizon 7 then generates a unique, short-lived certificate for the Windows login process. Benefits of True SSO True SSO Separates authentication (validating a user’s identity) from access (such as to a specific Windows desktop or application). Provides enhanced security. User credentials are secured...