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Re: [libvirt] Expose virDomainGetAutostart through virsh?



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 symlink approach.


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.


Daniel



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