When you have VirtualBox running, locate “File” in the top menu and click on it, then select “Import Appliance.” VirtualBox refers to virtual machines as appliances.
To make this process seamless, you can simply export the OVA file from the virtual machine you want to clone and import it to your new setup. Ideally, you would have to go through the entire process of installing the OS on your second virtual machine through the ISO file and manually copy all the settings. Or you may even want to transfer it to another PC. Let’s say you set up a virtual machine on your PC using VMware but now you want to run it through VirtualBox. G means gigabytes, M megabytes, K kilobytes, T terabytes, etc. Enter the needed disk size and virtual disk file according to your needs and configuration. To put it simply, these files store the configuration details required to set up virtual machines through software like VirtualBox, VMware, Microsoft System Centre Virtual Machine Manager, and Amazon’s Elastic Compute Cloud (Amazon EC2). In my example, I increase the size of my 10-GB virtual disk to 30 GB by using the command like below: vmkfstools -X 30G Ubuntu19.vmdk.
All this data is saved in the Open Virtualization Format, which is a standard format used to package and distribute software run in virtual machines. It includes a descriptor file (.OVF), optional manifest (.MF), certificate files, and other related files. An OVA file (Open Virtual Appliances) is a package that contains files used to describe a virtual machine.
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