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Re: [libvirt] [RFC,PATCH] network: add 'netboot' option to dhcp config



On Fri, Sep 11, 2009 at 09:22:09AM +0100, Mark McLoughlin wrote:
> On Fri, 2009-09-11 at 14:47 +1000, Jeremy Kerr wrote:
> > Currently, libvirtd will start a dnsmasq process for the virtual
> > network, but (aside from killing the dnsmasq process and replacing it),
> > there's no way to define tftp boot options.
> > 
> > This change introduces a 'netboot' tag to the dhcp configuration:
> > 
> >  <network>
> >    <name>default</name>
> >    <bridge name="virbr%d" />
> >    <forward/>
> >    <ip address="192.168.122.1" netmask="255.255.255.0">
> >      <dhcp>
> >        <range start="192.168.122.2" end="192.168.122.254" />
> >        <netboot root="/srv/tftp" file="pxeboot.img"/>
> >      </dhcp>
> >    </ip>
> >  </network>
> > 
> > When root= and file= attributes are present, these are passed to the
> > arguments to dnsmasq:
> > 
> >  dnsmasq [...] --enable-tftp --tftp-root /srv/tftp --dhcp-boot pxeboot.img
> > 
> > At present, only local tftp servers are supported (ie, dnsmasq runs as
> > the tftp server), but we could improve this in future by adding a
> > server= attribute.
> 
> I very much like this idea - e.g. I'd really like to have this to give
> people simple instructions for testing gPXE in next week's Fedora Test
> Day.
> 
> The argument was made before that it's pointless to use PXE like this
> when you can just explicitly configure a kernel/initrd, but that misses
> the point that sometimes you do explicitly want to use PXE, even just
> for testing purposes.
> 
> Patch looks good to me too, ACK

I like the idea too.
But this opens the door to outside access or just limits it to
the guest ? In any case make sure you have an up to date dnsmasq

  https://cert.belnet.be/belnetadvisories/rhsa-20091238-01-important-dnsmasq-security-update

Daniel

-- 
Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
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http://veillard.com/ | virtualization library  http://libvirt.org/


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