Difference between revisions of "KVM"

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(Migration from VirtualBox to KVM)
(Using VirtualBox and KVM together)
Line 4: Line 4:
 
* http://swaeku.github.io/blog/2013/04/04/run-kvm-and-virtualbox-together/
 
* http://swaeku.github.io/blog/2013/04/04/run-kvm-and-virtualbox-together/
  
Use VirtualBox
+
Use '''VirtualBox'''
 
  sudo service qemu-kvm stop
 
  sudo service qemu-kvm stop
 
  sudo service vboxdrv start
 
  sudo service vboxdrv start
  
OR use KVM
+
OR use '''KVM'''
 
  sudo service vboxdrv stop
 
  sudo service vboxdrv stop
 
  sudo service qemu-kvm start
 
  sudo service qemu-kvm start

Revision as of 20:03, 29 October 2013

Using VirtualBox and KVM together

Using VirtualBox and KVM together at the same server at the same time is NOT possible!!!

Use VirtualBox

sudo service qemu-kvm stop
sudo service vboxdrv start

OR use KVM

sudo service vboxdrv stop
sudo service qemu-kvm start

Decide!

Migration from VirtualBox to KVM

This boils down to

  1. having a lot of time
  2. having a lot of free harddisk space
  3. creating a clone of the vbox-machine with VBoxManage clonehd (this can take a looooong time!). Kloning is the easiest way of getting rid of snapshots of an existing virtual machine.
  4. converting the images from vdi to qcow-format with qemu-img convert
  5. creating and configuring a new kvm-guest
  6. adding some fou to NAT with a qemu-hook (see next section)

To clone an image - on the same machine - you have to STOP kvm and start vboxdr (see above). Also be aware, that the raw-images take up a lot of space!

# The conversion can take some time. Other virtual machines are not accessible in this time
VBoxManage clonehd -format RAW myOldVM.vdi /home/vm-exports/myNewVM.raw
0%...
cd /home/vm-exports/
qemu-img convert -f raw myNewVM.raw -O qcow2 myNewVM.qcow

Cloning a Snapshot:

# for a snapshot do (not tested)
cd /to/the/SnapShot/dir
VBoxManage clonehd -format RAW "SNAPSHOT_UUID" /home/vm-exports/myNewVM.raw

Accessing services on KVM guests behind a NAT

I am referring to this article:

which ist mentioned in the libvirt wiki:

I installed the qemu-python script of the first article under ubuntu 12.04 LTS, which worked like expected.

So I can access a port in the virtualmachine-guest with the IP/Port of the host (!). From within the host, it is possible to reach the guest via it's real ip. I am using the virtio-Interface (performance).