Re: [Xen-devel] virbr0/bridge: No such file or directory, rhel6 bridge-utils IGMP snooping

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Aug 29, 2011 at 03:52:59PM -0500, Scott Meyers wrote:
> 
> 
> Pasi,
> 
> Thank you for updating your tutorial.
> 
> Per your suggestion, I installed bridge-utils-1.2-9.fc13.i686 and the error 
> message is gone:
> 
> [root@pe1950]# brctl show
> bridge name bridge id  STP enabled interfaces
> virbr0  8000.000000000000 yes
> 
> 
> But, I still can not create a DomU. The bridge won't communicate with the 
> system. When I try to create DomU, "xm create -c vm101" The system can't find 
> CentOS mirror or the Kickstart file. Here is the result of the command 
> ifconfig:
> 
> 
> [root@pe1950]# ifconfig
> eth0      Link encap:Ethernet  HWaddr 00:15:C5:EF:77:DC  
>           inet addr:70.50.188.15  Bcast:70.50.188.255  Mask:255.255.255.0
>           inet6 addr: fe80::215:c5ff:feef:77dc/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:10220 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:852 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000 
>           RX bytes:731545 (714.3 KiB)  TX bytes:172998 (168.9 KiB)
>           Interrupt:16 Memory:f8000000-f8012800 
> 
> lo        Link encap:Local Loopback  
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:16436  Metric:1
>           RX packets:2 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:2 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0 
>           RX bytes:152 (152.0 b)  TX bytes:152 (152.0 b)
> 
> vif4.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF  
>           inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>           UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
>           RX packets:216 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:1 errors:0 dropped:5 overruns:0 carrier:0
>           collisions:0 txqueuelen:32 
>           RX bytes:6264 (6.1 KiB)  TX bytes:70 (70.0 b)
> 
> virbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF  
>           inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:1816 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:95 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0 
>           RX bytes:57784 (56.4 KiB)  TX bytes:11194 (10.9 KiB)
> 
> 
> Here is a copy of the DomU config file:
> 
>  
> 
> [root@pe1950]# cat /etc/xen/vm101
> # Standard variables
> kernel          = "/tmp/centos_5"
> ramdisk         = "/tmp/centos_5.img"
> extra           = "text ks=http://MYDOMIAN.tld/ks/ks.cfg";
> 
> name = "vm101"
> uuid = "813c0e59-8566-4386-95c1-0cc27af85a6d"
> maxmem = 512
> memory = 512
> vcpus = 1
> disk = [ "tap:aio:/vm/vm101/xvda.img,xvda,w" ]
> vif = [ "mac=00:16:3e:56:73:92,bridge=virbr0,script=vif-bridge" ]
> 
> 
> 
> [root@pe1950]# route
> Kernel IP routing table
> Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
> 70.50.188.0   *                 255.255.255.0   U     0      0        0 eth0
> 192.168.122.0   *               255.255.255.0   U     0      0        0 virbr0
> link-local      *               255.255.0.0     U     1002   0        0 eth0
> default         MYDOMAIN.tld    0.0.0.0         UG    0      0        0 eth0
> 
> Any idea what to do to solve this problem? Thank you
> 
>  


virbr0 is created by libvirtd/dnsmasq, so it's not really part of Xen.

Anyway, some things to verify:

- do you have ip_forwarding (routing) enabled in dom0?
- How are your firewall rules in dom0?
- Is dnsmasq running?
- Do you see domU dhcp requests in system logs (from dnsmasq) ?
- After the domU is started run "brctl show" - is the domU vif connected to 
virbr0 bridge?
- Run "tcpdump -i virbr0 -nn" - do you see the traffic from the vm?
- Does the domU get an IP? 


Those should get you going.

-- Pasi


> 
>  
> 
>  
> 
>  
> 
>  
> 
> > From: pasik@xxxxxx
> > To: scottmeyers@xxxxxxxx
> > CC: xen-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] virbr0/bridge: No such file or directory, rhel6 
> > bridge-utils IGMP snooping
> > 
> > I also added that info to http://wiki.xen.org/xenwiki/RHEL6Xen4Tutorial now.
> > 
> > -- Pasi                                       

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