[lvs-users] LVS - problem with switching beetwen servers behind LVS.

[Rafał Radecki <radecki.rafal@xxxxxxxxx>]

Hi All.

I currently have a problem, in lvs.cf I have:

virtual mail-pop3 {
    active = 1
    address = Y.Y.Y.181 eth0:1001
    vip_nmask = 255.255.255.0
    port = 110
    send = "\n"
    expect = "+OK"
    use_regex = 0
    load_monitor = none
    scheduler = wlc
    protocol = tcp
    timeout = 4
    reentry = 8
    quiesce_server = 0
    server imap-proxy-1 {
        address = X.X.X.X.66
        active = 1
        weight = 1
    }
    server imap-proxy-2 {
        address = X.X.X.X.68
        active = 1
        weight = 1
    }
    server imap-proxy-3 {
        address = X.X.X.X.70
        active = 1
        weight = 1
    }
    server imap-proxy-4 {
        address = X.X.X.X.71
        active = 1
        weight = 1
    }
}

In ipvsadm -L -n I have:

TCP  Y.Y.Y.181:995 wlc
  -> X.X.X.68:995           Route   1      34         118
  -> X.X.X.70:995           Route   1      33         239
  -> X.X.X.66:995           Route   1      34         100
  -> X.X.X.71:995           Route   1      35         93

In netstat -an | egrep 'X.X.X.66|X.X.X.68|X.X.X.70|X.X.X.71' I usually have:

tcp        0      0 X.X.X.2:58589         X.X.X.71:995          ESTABLISHED
tcp        0      0 X.X.X.2:58701         X.X.X.71:995          ESTABLISHED


When all imap-proxy servers are active switching beetwen them works fine.
But when imap-proxy-4 goes down then switching does not work, the requests
for Y.Y.Y.181 are not forwarded to X.X.X.{68,66,70,71}. In
/var/log/messages there is no info about problems with these hosts.

What could be wrong? How to troubleshoot the issue?

System info:
CentOS release 5.5 (Final)
piranha-0.8.4-16.el5
heartbeat-3.0.3-2.3.el5

Best regards,
Rafal Radecki.
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