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

["Fabrice Toppi" <ftoppi@xxxxxxxxx>]

Hi,

cifroes, according to LVS mini-howto, you can't use "ipvsadm ... -m" since your client, loadbalancer and webservers are on the same IP range.
You need to check the doc about LVS-DR (direct routing) if you want to keep you current IP addresses, else look for LVS-NAT.
Source: http://www.austintek.com/LVS/LVS-HOWTO/mini-HOWTO/LVS-mini-HOWTO.html

br,
Fabrice T.

2006/11/13, 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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