"This kernel requires an x86-64 CPU, but only detected an i686 CPU. Unable to boot." Error

[patocox]

Hi All,

I need to duplicate a production installation, and wanted to use a VM hosted by Tier 3. I used Ubuntu 12.04LTS 64-bit as the image and then installed Virtual Box 4.3, Vagrant 1.4.3 and NFS. When cloning the git repo for coreos using vagrant, and performing a vagrant up, the "Waiting for machine to boot. This may take a few minutes..." never resolves and I can see the VM goes into a state of:

"This kernel requires an x86-64 CPU, but only detected an i686 CPU. Unable to boot." 

On the host VM, typing:

$ uname -m

x86_64

Is this kind of nested VM - hypervisor to Virtual box supported by CoreOS?  Any ideas to get this working?

Thanks,

Pat

[Michael Marineau]

I don't think VirtualBox supports running inside another VM due to the
CPU virtualization extensions it needs. It isn't a limitation of
CoreOS itself.