Switching between Docker and VirtualBox on Windows 10
If you are receiving an error similar to “VT-x is not available (VERR_VMX_NO_VMX)” when starting a VirtualBox Virtual Machine after installing Docker, here is a solution:
The Issue:
Docker uses Hyper-V. VirtualBox uses VT-x. You cannot have both level 1 hypervirtualization technologies running currently.
The Solution:
To go from Docker to VirtualBox:
# Run from elevated prompt (admin privileges) bcdedit /set hypervisorlaunchtype off
To go back to Docker:
# Run from elevated prompt (admin privileges) bcdedit /set hypervisorlaunchtype auto
A reboot is required in both cases.