[libvirt] Expose virDomainGetAutostart through virsh?
pkrempa at redhat.com
Thu Nov 8 14:41:12 UTC 2012
On 11/08/12 15:13, Daniel P. Berrange wrote:
> On Wed, Nov 07, 2012 at 11:32:22AM +0100, Peter Krempa wrote:
>> On 11/07/12 11:04, Ruben Kerkhof wrote:
>>> Hi list,
>>> I'd like to check if a domain has autostart enabled. I do this now by
>>> looking if there's a symlink in /etc/libvirt/qemu/autostart, but it
>>> feels a bit hackish.
>>> Is this something that could be added to virsh?
>>> Something like virsh get-autostart domain would be great.
>> For now there are two options how to check the autostart flag:
>> 1) virsh dominfo - This is suitable to check for the state of a
>> single guest. Unfortunately we have just this one output option
>> where it is embedded with other information about the guest:
>> $ virsh dominfo tr
>> Id: 1
>> Name: tr
>> UUID: 17f42b42-9fdd-81e3-4a93-a75021a707d3
>> OS Type: hvm
>> State: running
>> CPU(s): 1
>> CPU time: 200.5s
>> Max memory: 53248 KiB
>> Used memory: 53248 KiB
>> Persistent: yes
>> Autostart: enable <- here!
>> Managed save: no
>> Security model: none
>> Security DOI: 0
>> 2) use virsh list --all --autostart to list guests that have the
>> autostart flag enabled (also note that there are script-friendly
>> outputs for virsh list --name and --uuid):
>> $ virsh list --all --autostart
>> Id Name State
>> 1 tr running
>> - Bare shut off
>> We're planing on adding the autostart flag as an XML element and a
>> few other improvements of autostaring guests.
> I don't think the XML should be in the business of having the
> autostart flag, as this is not guest configuration information.
> Having it in the XML introduces the problem of maintaining the
> correct synchronization between the autostart symlink and the
> XML description.
Yes, that will be troublesome. It's unfortunate we still have to use the
> Further, in the future I'd like to actually replace our current
> autostart code, with code that just sets up systemd units to
> deal with autostart.
> In such a scenario, the user will be able to toggle autostart
> directly using systemd, so we don't want libvirt duplicating
> that info in the XML since it won't be aware of when systemd
> changes the autostart flag.
Note that there are still distros that are doing everything possible to
avoid having systemd. It wouldn't be nice if we broke autostarting there.
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