radecki.rafal at gmail
Apr 11, 2012, 5:13 AM
Post #1 of 2
(224 views)
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[lvs-users] LVS - problem with switching beetwen servers behind LVS.
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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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