Knowledge Base for IT Professionals, Teachers and Astronauts
The user-specific settings in the Windows registry are stored under the HKEY_CURRENT_USER key. If you open the Regedit.exe application the HKEY_CURRENT_USER key contains the settings for your user account. To access the registry keys of another user we need to Find the Security ID of the user In Regedit navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\hivelist The key lists the Security IDs and …
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AWS changed how Windows Server EC2 instances send messages during boot. Windows Server 2012 R2 AWS EC2 instances sent the “Windows is ready” message every time those became available after boot. When a Windows Server 2016 AWS EC2 instance launches, it only sends the “Windows is ready” message during the first boot. If you create your custom …
When you use a virtual machine to write your Chef cookbooks you may want to test them locally with Vagrant. This nested virtual machine cannot use a 64 bit operating system, because to run a 64 bit virtual machine, the host computer’s CPU has to provide the CPU Extensions. Currently only physical CPUs can provide …
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There can be reasons when we want to run a VirtualBox virtual machine on another VirtualBox virtual machine. I am setting up a Windows virtual machine to interview job candidates and want to run a small Ubuntu virtual machine on the Windows virtual machine. It is not recommended for performance reasons, but I want to …
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When your VirtualBox virtual machine’s hard drive fills up Virtual Box does not provide a user interface to extend it. If you run VirtualBox on a Macintosh workstation Stop the virtual machine On a Macintosh workstation, the virtual machine image files are located at ~/VirtualBox VMs The name of the subdirectory and the image file matches the …
Bang methods (Exclamation point at the end of the method name) There are methods that have a permanent or dangerous version. The exclamation point designates to use the dangerous version of the method. String manipulation The bang versions of the string manipulation methods (with the exclamation point), modify the string variable in place. Some of these methods …
The AWS account number uniquely identifies the AWs account you are working with. All AWS “arn” identifiers contain it, and you need to know it when you want to share AMIs with other accounts. If there are no resources created yet in the account, you can find the account number in the “arn” of your user …
Terraform is a very powerful, free command-line tool to launch servers in any cloud or virtual machine environment. Hashicorp, the creator of Terraform just introduced the paid Terraform Enterprise server, that orchestrates the execution of the Terraform scripts. Octopus is another tool that added Terraform orchestration functionality in version 2018.3 In this example, we will set …
Chef is under heavy development, every new major version introduces new features, and many times changes, deprecates, or removes some commands or options. Chef Client 13 introduced a new way of handling reboots and Windows scheduled tasks. reboot resource In Chef version 12, the “:reboot_now” action continued the execution of the Chef cookbook but after …
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Jenkins regularly releases new versions. To upgrade Jenkins On Linux To install the Generic Java Package (.war) Write down the current version of Jenkins you have on your server Download the Jenkins “Generic Java Package (.war)” file from https://jenkins.io/download/to your workstation Upload the installer to Artifactory or other HTTP repository SSH into the Jenkins server Switch to sudo mode …