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

[cifroes <cifroes@xxxxxxxxxx>]

Hi,

Thanks.

I tried already with LVS-DR and it also doesn't work... (in VMWare, 
LVS-NAT works)

Regards,
-- cifroes


Fabrice Toppi wrote:
> 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 <mailto: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 <http://192.168.200.180:8080>
>     -s rr
>     > ipvsadm -a -t 192.168.200.180:8080 <http://192.168.200.180:8080>
>     -r 192.168.200.185:8080 <http://192.168.200.185:8080> -m
>     > ipvsadm -a -t 192.168.200.180:8080 <http://192.168.200.180:8080>
>     -r 192.168.200.190:8080 <http://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 <http://192.168.200.150> ->
>     192.168.200.185 <http://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 <http://192.168.200.185> ->
>     192.168.200.150 <http://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
>     <http://192.168.200.150> -> 192.168.200.185
>     <http://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 <http://192.168.200.150> ->
>     192.168.200.180 <http://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 <http://192.168.200.150> ->
>     192.168.200.185 <http://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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