Re: Boot script

[Anthony Liguori <anthony@codemonkey.ws>]

Matthias Pfafferodt wrote:
> Hello,
>
> my server runs XEN with 5 domains at the moment. I will get new hardware this 
> week and I think about trying to do the virtualisation using KVM.
>
> Xen has small scripts which
>
> * set up the bridged network at boot
>   

I just manually configure a bridge through my distro's networking 
scripts.  I've got what I do fully documented at 
http://kvm.qumranet.com/kvmwiki/AnthonyLiguori/Networking

You can also use libvirt to manage KVM in which case, it will 
automagically configure networking for you.

> * start all domains at boot time (or restore saved domains)
>   

I just use a script in /etc/init.d/ that I wrote but libvirt will also 
do this for you.

> * save the domains at shutdown
>   

As in, do a save at shutdown?  That seems pretty scary to me.  I don't 
know what libvirt does on shutdown but I'm sure someone can chime in.

> Are there such scripts for KVM? I would like to have an init script which does 
> all the things listed above.
>
> Is this even possible with qemu/kvm (save/restore a domain using shell 
> commands)?
>   

You have two options.  If you use libvirt, you can issue commands via 
virsh.  If you don't use libvirt, you need to have the monitor sit on a 
unix domain socket or on a TCP socket and you can issue commands to the 
monitor via a tool like socat.

libvirt is by far the simplest choice for managing KVM but it's possible 
to do these things without it.

Regards,

Anthony Liguori

> Thanks
>
> Matthias
>
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