[libvirt-users] remove cdrom after installing os on a guest

[Martin Kletzander]

On Fri, Jan 08, 2016 at 01:10:03PM +0000, Andrei Perietanu wrote:
>Hi all,
>I have the following issue, and I hope someone know a way to handle it.
>
>I need to grammatically  need to create/install a guest OS using the
>libvirt API.
>Currently what I do:
> 1. create a xml with the vm configuration (this will include a path to the
>iso image)
> 2. connection.defineXML(<my_config>)
> 3. vm = connection.lookupByName(<domain_name>)

1. you can do vm = connection.defineXML(<my_config>)

but that's just a detail

> 4. vm.create()
>

2. You can set:

<on_reboot>destroy</on_reboot>

That will destroy your guest after it reboots.  Then you can start it
with new configuration.  Don't forget to change the on_reboot in the new
config.

3. You can do defineXML() without that cdrom and then do createXML()
with the temporary config (with cdrom).  Then after the guest is
destroyed, you can just start it and it will automatically use the
configuration without cdrom.

This won't fix your problem, it's just another way to use multiple
configs, it will work even if something goes wrong around that reboot.

4. You can subscribe to the restart event and upon that event being
fired, you just eject media from the cdrom.

5. You can set <boot order='x'/> for the disk and the cdrom, with the
disk having x = 1 and the cdrom having x = 2 (or the older way with
<boot dev='hd'/><boot dev='cdrom'/> ) that way it will boot from
the hd if it is bootable and fallback to the cdrom when it is not.

>This will create a new guest and boot the iso to install the OS. But after
>installation, when I restart, It again boots from the cdrom. So obviously I
>need remove the cdrom somehow.
>
>I could edit the xml and manually remove the cdrom, but the problem here is
>how do I know when to do that - i.e. how do I know if the OS has been
>installed or not?
>
>If I use virsh-install to create a guest with the same configuration, after
>the OS is installed, the cdrom is automatically removed form the guest
>configuration.
>
>
>Any help is greatly appreciated.
>
>Andrei
>
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>
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