xen discuss - Feb 2008 - Attempt to configure SNV81 DomU with DHCP at F8 (32 bit) Dom0

I’ve placed F8 Dom0  box on DHCP bridge. Service “dnsmasq” 
behaves exactly  the same way  as on F8 Dom0 box with static IP :-
It serves dhcp requests from RH DomUs and refuse to serve dhcp request 
from SNV76,78,81  DomUs .  Any dhcp request from SNV DomU 
gets timed out.
Regarding CentOS 5.1 Dom0 boxes, everything works just fine and doesn’t
depend on network config for Dom0:-
“dnsmasq”  serves dhcp request from SNV76,78,81 with no delays

I guess, if eth0 is configured as DHCP at Linux Dom0, to create SNV DomU
with xnf0 configured as DHCP  i need an entry into  xend-config.sxp.

(network-script 'network-bridge bridge=xenbr0 netdev=eth0')

been read by xend daemon at boot up so that:-

root@UbuntuGutsy:~# brctl show

bridge name     bridge id               STP enabled     interfaces
xenbr0          8000.feffffffffff       no                       vif0.0

                                                                             
peth0

It seems , that libvirtd daemon built in behavior at F8 Dom0
doesn't allow to do that and does allow to do that at CentOS 5.1 Dom0:-
# chkconfig libvirtd off
I cannot disable libvirtd on F8 to turn off virbr0 and work with old fashioned
xen-bridge. External DHCP Server appears to be useless for me on Fedoras
However, due to multiple MRJ's feedbacks i understand , that someting
has been done incorrect.
 
 
This message posted from opensolaris.org
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Boris Derzhavets wrote:
> I’ve placed F8 Dom0  box on DHCP bridge. Service “dnsmasq” 
> behaves exactly  the same way  as on F8 Dom0 box with static IP :-
> It serves dhcp requests from RH DomUs and refuse to serve dhcp request 
> from SNV76,78,81  DomUs .  Any dhcp request from SNV DomU 
> gets timed out.
> Regarding CentOS 5.1 Dom0 boxes, everything works just fine and doesn’t
> depend on network config for Dom0:-
> “dnsmasq”  serves dhcp request from SNV76,78,81 with no delays
> 
> I guess, if eth0 is configured as DHCP at Linux Dom0, to create SNV DomU
> with xnf0 configured as DHCP  i need an entry into  xend-config.sxp.
> 
> (network-script 'network-bridge bridge=xenbr0 netdev=eth0')
> 
> been read by xend daemon at boot up so that:-
> 
> root@UbuntuGutsy:~# brctl show
> 
> bridge name     bridge id               STP enabled     interfaces
> xenbr0          8000.feffffffffff       no                       vif0.0
> 
>                                                                            
peth0
> 
> It seems , that libvirtd daemon built in behavior at F8 Dom0
> doesn't allow to do that and does allow to do that at CentOS 5.1 Dom0:-
> # chkconfig libvirtd off
> I cannot disable libvirtd on F8 to turn off virbr0 and work with old
fashioned
> xen-bridge. External DHCP Server appears to be useless for me on Fedoras
> However, due to multiple MRJ's feedbacks i understand , that someting
> has been done incorrect.
It could be that they recently change something in FC8?  I haven't
sync'd
up recently.



MRJ


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xen-discuss mailing list
xen-discuss@opensolaris.org

> It could be that they recently change something in
> FC8?  I haven''t sync''d
> up recently.
Does your statement mean, that you just turned into old fashioned
xen-bridging , having libvirtd daemon (as well as virbr0 ) disabled  on F8
?
> 
> 
> 
> MRJ
> 
> 
> _______________________________________________
> xen-discuss mailing list
> xen-discuss@opensolaris.org
 
 
This message posted from opensolaris.org

This thread follows up another one:-
**********************************************************
Thread: Xen 3.1 Linux Dom0 (x86_64) & PYGRUB 
**********************************************************
http://www.opensolaris.org/jive/thread.jspa?threadID=45488&tstart=30
 
 
This message posted from opensolaris.org

I believe the answer how to get access to DHCP Server having libvirtd up and
running follows bellow (thanks Google) :-
http://marc.info/?l=fedora-xen&m=119646437601158&w=2
Quote:-

I have a bridge on VLAN 6 so I call it br6 you can use xenbr0 is you
like. Mine mostly looks something like this after removing the VLAN
trunk complication:

# cat ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
BRIDGE=br6

# cat ifcfg-br6
DEVICE=br6
TYPE=Bridge
BOOTPROTO=static
ONBOOT=yes
IPADDR=10.10.6.1
NETMASK=255.255.255.0
NETWORK=10.10.6.0
BROADCAST=10.10.6.255

Now your primary IP of your dom0 lives on the br6 interface. Your
domU''s
will be on the same VLAN and should see your DHCP server. Don''t forget
to enable IP forwarding.

# grep phys /etc/sysconfig/iptables
-A FORWARD -m physdev  --physdev-is-bridged -j ACCEPT

# grep forward /etc/sysctl.conf
# Controls IP packet forwarding
net.ipv4.ip_forward = 1

p.s. use ''brctl show'' to see your bridges.
 
 
This message posted from opensolaris.org

F7 Dom0 (64 bit) installed with static IP.
/etc/xen/xend-config.sxp modified as follows:-

# (network-script network-bridge)
#### LAPTOP USERS ! #####
# For laptops, or machines where network interfaces come/go on-the-fly,
# or are otherwise managed by NetworkManager, comment out the above line.
# Then, uncomment the line below, and use libvirt''s virtual networking
# capability which sets up a isolated bridge + NAT forwarding
(network-script /bin/true)

# service xend restart

Both services libvirtd and dnsmasq are up and running.
Interface virbr0 actived 192.168.122.1
SNV 81 installed with DHCP option on libvirtd (dnsmasq) network.

In case when vif=['' '']

[root@fedora7xen vm]# brctl show
bridge name     bridge id               STP enabled     interfaces
tmpbridge               8000.feffffffffff       no              vif5.0
virbr0          8000.000000000000       no

and DHCP request to libvirtd''s network times out

In case when vif=[''bridge = virbr0'']

[root@fedora7xen vm]# brctl show
bridge name     bridge id               STP enabled     interfaces
tmpbridge               8000.000000000000       no
virbr0          8000.feffffffffff       no              vif6.0


DHCP request to libvirtd''s network succeseeded in 1-2 minutes


Installation profile:-

name = "Solaris81"
vcpus = 1
memory = "1024"
kernel = "/usr/lib/xen-solaris/unix-81"
ramdisk = "/usr/lib/xen-solaris/x86.miniroot-81"
extra = "/platform/i86xpv/kernel/amd64/unix - nowin -B
install_media=cdrom"
disk =
[''file:/usr/lib/xen-solaris/snv81.iso,6:cdrom,r'',''phy:/dev/sdb7,0,w'']
vif = [''bridge = virbr0'']
on_shutdown = "destroy"
on_reboot = "destroy"
on_crash = "destroy"

Runtime profile:-

name = "Solaris81"
vcpus = 1
memory = "1024"
kernel = "/usr/lib/xen-solaris/unix-81"
ramdisk = "/usr/lib/xen-solaris/x86.miniroot-81"
extra = "/platform/i86xpv/kernel/amd64/unix"
disk = [''phy:/dev/sdb7,0,w'']
vif = [''bridge = virbr0'']
root= "/dev/dsk/c0d0s0"
on_shutdown = "destroy"
on_reboot = "destroy"
on_crash = "destroy"
 
 
This message posted from opensolaris.org