On Fri, May 31, 2013 at 7:18 AM, Ben Pfaff <b...@nicira.com> wrote:
> On Fri, May 31, 2013 at 06:47:34AM +0800, Zhi Yong Wu wrote:
>> If multiple vswitches exist on the same host, how about the routes
>> on the host?
>
> I don't understand this question. It appears to ask whether multiple
ah, sorry for my unclear question. Let me try again:
e.g. we add multiple virtual bridges on the same host, If we need to change
the routes on the host in order that all guests attached to different switches
can access external world based on the advices from FAQ, do you think it
is convenient to the sys admin or the users? maybe he need to change a lot
of routes on the host.
> rules may exist on a host. The answer to that question is "yes", but
> I doubt it is the question you meant to ask.
>
>> by the way, can i consult another question? Why did OVS introduce two
>> internal devices for each vswitch?
>
> It didn't. There is one internal device for ovs-system, and one for
> br0. If you add a second bridge, you will have three internal
> devices.
Why need it to introduce ovs-system? i remember that OVS had no such
internal device before. I searched some comments, but don't make sure
to understand it. Can you give some explaination?
- All dpif-based bridges of a particular type share a common
datapath called "ovs-<type>", e.g. "ovs-system". The ovs-dpctl
commands will now return information on that shared datapath. To
get the equivalent bridge-specific information, use the new
"ovs-appctl dpif/*" commands.
>
>> ovs-dpctl show
>> system@ovs-system:
>> lookups: hit:2635398 missed:145705 lost:0
>> flows: 12
>> port 0: ovs-system (internal)
>> port 1: br0 (internal)
>> port 2: em1
>>
>>
>>
>> On Fri, May 31, 2013 at 6:26 AM, Ben Pfaff <b...@nicira.com> wrote:
>> > Q: I created a bridge and added my Ethernet port to it, using commands
>> > like these:
>> >
>> > ovs-vsctl add-br br0
>> > ovs-vsctl add-port br0 eth0
>> >
>> > and as soon as I ran the "add-port" command I lost all connectivity
>> > through eth0. Help!
>> >
>> > A: A physical Ethernet device that is part of an Open vSwitch bridge
>> > should not have an IP address. If one does, then that IP address
>> > will not be fully functional.
>> >
>> > You can restore functionality by moving the IP address to an Open
>> > vSwitch "internal" device, such as the network device named after
>> > the bridge itself. For example, assuming that eth0's IP address is
>> > 192.168.128.5, you could run the commands below to fix up the
>> > situation:
>> >
>> > ifconfig eth0 0.0.0.0
>> > ifconfig br0 192.168.128.5
>> >
>> > (If your only connection to the machine running OVS is through the
>> > IP address in question, then you would want to run all of these
>> > commands on a single command line, or put them into a script.) If
>> > there were any additional routes assigned to eth0, then you would
>> > also want to use commands to adjust these routes to go through br0.
>> >
>> > If you use DHCP to obtain an IP address, then you should kill the
>> > DHCP client that was listening on the physical Ethernet interface
>> > (e.g. eth0) and start one listening on the internal interface
>> > (e.g. br0). You might still need to manually clear the IP address
>> > from the physical interface (e.g. with "ifconfig eth0 0.0.0.0").
>> >
>> > There is no compelling reason why Open vSwitch must work this way.
>> > However, this is the way that the Linux kernel bridge module has
>> > always worked, so it's a model that those accustomed to Linux
>> > bridging are already used to. Also, the model that most people
>> > expect is not implementable without kernel changes on all the
>> > versions of Linux that Open vSwitch supports.
>> >
>> > By the way, this issue is not specific to physical Ethernet
>> > devices. It applies to all network devices except Open vswitch
>> > "internal" devices.
>> >
>> > On Fri, May 31, 2013 at 06:19:19AM +0800, Zhi Yong Wu wrote:
>> >> Yes
>> >>
>> >> # ovs-vsctl show
>> >> a9dc55a3-6755-4b91-957a-75cd9f27692e
>> >> Bridge "br0"
>> >> Port "em1"
>> >> Interface "em1"
>> >> Port "br0"
>> >> Interface "br0"
>> >> type: internal
>> >>
>> >>
>> >> On Fri, May 31, 2013 at 6:17 AM, Ben Pfaff <b...@nicira.com> wrote:
>> >> > Is em1 on bridge br0?
>> >> >
>> >> > On Fri, May 31, 2013 at 05:59:32AM +0800, Zhi Yong Wu wrote:
>> >> >> I tried to install OVS on my workstation, before starting kvm guest,
>> >> >> its route table is below:
>> >> >> default via 9.115.122.1 dev em1
>> >> >> 9.115.122.0/24 dev em1 scope link
>> >> >>
>> >> >> then i started kvm guest:
>> >> >> qemu-system-x86_64 -drive
>> >> >> file=/home/zwu/misc/image/debian_squeeze_i386_desktop.qcow2,if=virtio
>> >> >> -kernel arch/x86/boot/bzImage -append root=/dev/vda1 rw console=ttyS0
>> >> >> -drive file=/btrfs.img,if=virtio -drive file=/btrfs1.img,if=virtio
>> >> >> -drive file=/btrfs2.img,if=virtio -drive file=/btrfs3.img,if=virtio
>> >> >> -nographic -S -s -m 10240M
>> >> >>
>> >> >> After kvm guest is started up, i tried to ping the host in kvm guest,
>> >> >> but it failed.
>> >> >> After i changed its route on the host as below:
>> >> >> default via 9.115.122.1 dev br0
>> >> >> 9.115.122.0/24 dev br0 scope link
>> >> >> I again tried the host in kvm guest, and it can work.
>> >> >>
>> >> >> Is it clear to you?
>> >> >>
>> >> >>
>> >> >> On Fri, May 31, 2013 at 5:47 AM, Ben Pfaff <b...@nicira.com> wrote:
>> >> >> > I don't know. I think that you would have to describe your scenario,
>> >> >> > before we can say what (if anything) you are doing wrong.
>> >> >> >
>> >> >> > On Fri, May 31, 2013 at 05:45:06AM +0800, Zhi Yong Wu wrote:
>> >> >> >> If i don't add such a route, it seem to not work, do i miss other
>> >> >> >> something?
>> >> >> >>
>> >> >> >> On Fri, May 31, 2013 at 2:23 AM, Ben Pfaff <b...@nicira.com> wrote:
>> >> >> >> > On Thu, May 30, 2013 at 06:40:26PM +0800, zwu.ker...@gmail.com
>> >> >> >> > wrote:
>> >> >> >> >> From: Zhi Yong Wu <wu...@linux.vnet.ibm.com>
>> >> >> >> >>
>> >> >> >> >> Add some tips for kvm guest; You know, it is a bit difficult
>> >> >> >> >> to play for one starter if no such tips exist.
>> >> >> >> >>
>> >> >> >> >> Signed-off-by: Zhi Yong Wu <wu...@linux.vnet.ibm.com>
>> >> >> >> >
>> >> >> >> > It isn't normally necessary to add such a route.
>> >> >> >>
>> >> >> >>
>> >> >> >>
>> >> >> >> --
>> >> >> >> Regards,
>> >> >> >>
>> >> >> >> Zhi Yong Wu
>> >> >>
>> >> >>
>> >> >>
>> >> >> --
>> >> >> Regards,
>> >> >>
>> >> >> Zhi Yong Wu
>> >>
>> >>
>> >>
>> >> --
>> >> Regards,
>> >>
>> >> Zhi Yong Wu
>>
>>
>>
>> --
>> Regards,
>>
>> Zhi Yong Wu
--
Regards,
Zhi Yong Wu
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