Kubernetes commands

kubectl get – list resources kubectl describe – show detailed information about a resource kubectl logs – print the logs from a container in a pod kubectl exec – execute a command on a container in a pod List existing pods Get detailed information on the pods Start a proxy to access the containers within the pod Get the […]

Install missing commands on Linux distributions

On some lean systems, mostly in Docker containers, some important commands are not readily available. The table below shows the command to install them. To get the name of the Linux distribution execute To find the package that contains the command, install apt-file Update the file package mapping database Search for the command at the […]

How to duplicate a Windows server that is attached to the Windows Domain

When a Windows server is attached to a Domain only one instance of it can run at a time. To be able to duplicate the server and start a second instance of it Create an image of the server Remote into the server Make sure there is a local administrator account that you can log […]

Unable to insert the virtual optical disk in an Ubuntu virtual machine

When you try to install a new version of the VirtualBox Guest Addition on an Ubuntu virtual machine you may get the error message Unable to insert the virtual optical disk C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso into the machine Ubuntu 64. Could not mount the media/drive ‘C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso’ (VERR_PDM_MEDIA_LOCKED). Result Code: E_FAIL (0x80004005) Component: ConsoleWrap Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed} […]

Raw-mode is unavailable courtesy of Hyper-V error in VirtualBox

For VirtualBox to be able to start virtual machines, Hyper-V has to be turned off in Windows 10. If you get the error message when you try to launch a virtual machine in VirtualBox Raw-mode is unavailable courtesy of Hyper-V Check the Hyper-V setting Open a command prompt as an administrator, Execute the command: bcdedit […]

Windows application installation error codes

To enable logging of .msi packages open a command prompt as an administrator and execute MY_APPLICATION.msi /l*vx install.log Error Code Explanation 2 ? 1603 Error message from the operating system dll can not register msi installation failed required version of the .NET framework missing 1605 Nothing to uninstall ? 1618 ? 1619 The source directory does […]

Stop multiple untagged AWS EC2 instances with a Bash script

 List all EC2 instances without a specific tag One day we have found 499 instances running in our account without any tags. Most likely someone accidentally started a process to launch those, so we needed a way to find them and stop them. Later we will terminate them with the same script below when we can make […]

“incompatible-network” error when launching an AWS RDS instance

When the AWS subnet has no enough IP addresses Terraform displays the following error message: * aws_db_instance.default: unexpected state ‘incompatible-network’, wanted target ‘available, storage-optimization’. last error: %!s(<nil>) Make sure the subnet has enough available IP addresses.

Docker commands to run images

Maven Navigate to the Maven project directory on your workstation and launch the Maven container. To run a Maven project by using the Maven Docker image directly, passing a Maven command to docker run. docker run -it –rm –name my-maven-project -v “$(pwd)”:/usr/src/mymaven -w /usr/src/mymaven maven:3.3-jdk-8 mvn clean install To launch the Maven Docker container and open […]