Problem setting up LVS (load-balancer, linux virtual server) in Xen Virtual Machine

Discussion in 'Server Operation' started by cifroes, Nov 6, 2006.

  1. cifroes

    cifroes New Member

    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
     
  2. falko

    falko Super Moderator

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