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Re: [libvirt-users] So why does "destroy" not actually destroy?



To my opinion there is nothing confusing about de semantics:

virsh shutdown => try to shut down the guest gracefully (normally you want to use this)

virsh destroy => kill the guest!! The term 'destroy' implies something aggressive. Normally you don't want to use destroy unless you know what you're doing. If you don't know what you are doing, most of the times, this command is invoced on trying to undefined a guest (like in your case). Which probably results in doing nothing. I think this is a rather monkey-proof choice of semantics...

Virsh undefined => remove the guest definition from the host (storage will remain)

To be less polite: RTFM => use 'virsh help' and 'virsh help {command}' to investigate the commands...

Dominique.


-----Oorspronkelijk bericht-----
Van: libvirt-users-bounces redhat com [mailto:libvirt-users-bounces redhat com] Namens Kashyap Chamarthy
Verzonden: dinsdag 14 juli 2015 13:22
Aan: KARR, DAVID
CC: libvirt-users redhat com
Onderwerp: Re: [libvirt-users] So why does "destroy" not actually destroy?

On Tue, Jul 14, 2015 at 12:51:31AM +0000, KARR, DAVID wrote:
> I thought it odd that if I have a running VM and I do "virsh destroy"
> it results in a VM that is "shut off".  To ACTUALLY destroy a VM, you 
> have to follow that with "undefine".  Could someone elaborate on how 
> we ended up with these slightly confusing semantics?

I asked this question in 2011[1]. Quoting the two responses from that thread.

Michal Privoznik:

    "Libvirt has this philosophy to be backward compatible and therefore
    not to change old API including virsh commands. But as time flies,
    some APIs are consumed by new ones (virDomainCreateLinux is now just
    alias for virDomainCreateXML). So changing this is not feasible way.
    What might be, is to create less invasive aliases. But we can't make
    'destroy' command to go away."


Also see response from Eric Blake[2] (and others on that thread) on that
thread:


[1] https://www.redhat.com/archives/libvir-list/2011-June/msg00620.html
    -- "Request to rename 'destroy' to something milder"
[2] https://www.redhat.com/archives/libvir-list/2011-June/msg00656.html

--
/kashyap

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