Re: [Xen-users] Re: Problem setting up LVS (Linux Virtual Server) in Xen Virtual

[cifroes <cifroes@xxxxxxxxxx>]

I don't understand much also about bridging/routing...

I still have my problem unresolved.

Andersen, Erling wrote:
> I'm seeing the same problem running the LVS load-balancer and a couple of real 
> servers as virtual machines. My setup is based on Ubuntu 6.10.
>
> However, the problem only appears when the load-balancer and the real servers 
> are running on the same physical machine (dom0). When migrating the 
> load-balancer live to another physical computer on the same subnet, the network 
> traffic all of a sudden starts to work! This leads me to believe there is a 
> problem with the bridge in dom0. There are some indications on this in the 
> document http://en.opensuse.org/Xen3_and_a_Virtual_Network which discusses 
> moving the bridge/router to a virtual machine.
>
> I'm not a bridge expert and do not understand why the brouter setup in the 
> document above would be necessary. Is there some way to make our setup with the 
> bridge in dom0 work?
>
> -Erling
>
> Original posting:
>
> To:  xen-users@xxxxxxxxxxxxxxxxxxx 
> Subject:  [Xen-users] Problem setting up LVS (Linux Virtual Server) in Xen Virtual Machine 
> From:  cifroes <cifroes@xxxxxxxxxx> 
> Date:  Mon, 06 Nov 2006 19:29:22 +0000 
>
> Hi all,
>
>
> I'm trying to setup 3 virtual machines, 1 with LVS (Linux Virtual Server) load-balancing and 2 with Tomcat+Axis (webserver and stuff). 
>
> I'm using openSUSE 10.1 (xen 3.0.2) in all VMs and Dom0. rcSuseFirewall is stopped, iptables -l report everything "accept"'ing. 
>
> Here's my IP configuration:
> http://pwp.netcabo.pt/pformoso/network.gif
>
> You can see there are 3VMs running.
>
>
> In the LB virtual machine I configure Linux Virtual Server (ipvsadm):
> ipvsadm -A -t 192.168.200.180:8080 -s rr
> ipvsadm -a -t 192.168.200.180:8080 -r 192.168.200.185:8080 -m
> ipvsadm -a -t 192.168.200.180:8080 -r 192.168.200.190:8080 -m
>
> I also set ip_forward:
> echo "1" > /proc/sys/net/ipv4/ip_forward
>
>
> Then, in dom0 I try my LVS:
> lynx http://192.168.200.180:8080
> but I only get "making http connection to xxxx..."
>
>
> Tomcat logs in both VMs don't report the connection.
> TCP sniffer in VM10/20 reports:
> Capturing on eth0
>
> 1 0.000000 192.168.200.150 -> 192.168.200.185 TCP 44000 > http-alt [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460 TSV=19301554 TSER=0 WS=2 2 0.009607 192.168.200.185 -> 192.168.200.150 TCP http-alt > 44000 [SYN, ACK] Seq=0 Ack=1 Win=5792 Len=0 MSS=1460 TSV=19273803 TSER=19301554 WS=2 3 0.009658 192.168.200.150 -> 192.168.200.185 TCP 44000 > http-alt [RST] Seq=1 Ack=4283853535 Win=0 Len=0 
>
> TCP sniffer in LB reports:
>
> 1 0.000000 192.168.200.150 -> 192.168.200.180 TCP 44000 > http-alt [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460 TSV=19301554 TSER=0 WS=2 2 0.009344 192.168.200.150 -> 192.168.200.185 TCP 44000 > http-alt [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460 TSV=19301554 TSER=0 WS=2 
>
>
>
> Any ideas why this doesn't work? How should I do it? Any tutorial/howto help is appreciated. 
>
> Thanks in advance,
> --cifroes
>
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>
>
>   

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