Re: [libvirt-users] Virtual machine removal through command line.
On 18.12.2014 23:35, Le Bris Gilles wrote:
Hi,
Until today, I hadn't found a way to cleanly remove a KVM virtual
machine through command line on CentOS 6 or 7! I had to run 'systemctl
restart libvirtd' or 'service libvirtd restart'
After several months (!!!), I found this thread:
https://github.com/pradels/vagrant-libvirt/issues/107
Now, I know how to cleanly remove a KVM virtual machine (with default
file location):
virsh destroy vm.example.com <http://vm.example.com>
virsh undefine vm.example.com <http://vm.example.com> --managed-save
/bin/rm /var/lib/libvirt/images/vm.example.com.img
/bin/rm /var/log/libvirt/qemu/vm.example.com.log
virsh vol-delete /var/lib/libvirt/images/vm.example.com.img --pool default
I don't know if the last command ('virsh vol-delete' avoiding the
libvirtd restart) is a bug or a feature but it must be documented! Only
a libvirt developer can guess something like this.
Well, there are basically two ways how to provide a diskt to a VM. The
first one is to provide a path to the file directly, the other is to
provide a volume and pool names. It's documented here:
http://libvirt.org/formatdomain.html#elementsDisks
There are plenty of examples, like:
<disk type='volume' device='disk'>
<driver name='qemu' type='raw'/>
<source pool='blk-pool0' volume='blk-pool0-vol0'/>
<target dev='hdk' bus='ide'/>
</disk>
Then, when undefying a domain, you can certainly do 'vol-delete'. It
comes natural if you have it that way.
What's interesting here though, is that restarting the daemon makes VMs
go away. Although, since you have to pass '--managed-save' to the
'undefine' command, I guess the libvirt-guests.service is configure to
managed save you guests. So they are not really gone, rather than saved
on your disk:
# virsh list --all
Id Name State
----------------------------------------------------
- dummy shut off
- fedora shut off
- fedora21 shut off
- freebsd shut off
- gentoo shut off
- migt10 shut off
- rhel7 shut off
- win7 shut off
Michal