how to edit dhcp configuration

[Pavel Lisy]

Hello

I want to set fixed IP for host (from MAC address) in dhcp. How can I do
it through libvirt configuration?

There is not possibility set it in virt-manager. I can edit manually
ldapnet.xml (ldapnet is name of my network) but:

1. question:
Where is right place to edit it:
/etc/libvirt/qemu/networks/ldapnet.xml
or
/var/lib/libvirt/network/ldapnet.xml
(after reboot one file replaces other but which direction but I didn't
find which direction)

2. question:
How can I propagate this changes?

Neither 
/etc/init.d/libvirtd reload
/etc/init.d/libvirtd restart
changes dnsmasq settings. It is done only during reboot, why?

3. I've found this workaround: 
* kill dnsmasq process for this settings
* start dnsmasq with new settings, ex.
   .... --dhcp-host 52:54:00:22:a7:76,ldap-m1.ldapnet.tmapy.cz,192.168.241.101
Is it way how to do it through libvirt utility?

Pavel

[Cole Robinson]

On 10/19/2009 06:37 AM, Pavel Lisy wrote:
> Hello
>
> I want to set fixed IP for host (from MAC address) in dhcp. How can I do
> it through libvirt configuration?
>
> There is not possibility set it in virt-manager. I can edit manually
> ldapnet.xml (ldapnet is name of my network) but:
> question:
>
> Where is right place to edit it:
> /etc/libvirt/qemu/networks/ldapnet.xml
> or
> /var/lib/libvirt/network/ldapnet.xml
> (after reboot one file replaces other but which direction but I didn't
> find which direction)

The 'right' place is to use 'virsh net-edit <network name>'. Editing the
files in place provides no error checking and can require a libvirtd
restart. The user shouldn't have to know where the files are kept.
> question:
>
> How can I propagate this changes?
>
> Neither 
> /etc/init.d/libvirtd reload
> /etc/init.d/libvirtd restart
> changes dnsmasq settings. It is done only during reboot, why?

Before you make the changes, do 'virsh net-destroy <net name>'. This
will shutdown the network (dnsmasq), but NOT delete it in any way. Then
use 'virsh net-edit <net name>' as mentioned above to make your changes.
Finally, use 'virsh net-start <net name>' which will start a new dnsmasq
process.

- Cole
> I've found this workaround:
> kill dnsmasq process for this settings
> start dnsmasq with new settings, ex.
>  .... --dhcp-host 52:54:00:22:a7:76,ldap-m1.ldapnet.tmapy.cz,192.168.241.101
>
> Is it way how to do it through libvirt utility?
>
> Pavel