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Hi,

I have both LVS+keepalived and nginx running on same box and came
across this issue, configuration below:

keepalived.conf: (So LVS should handle 10.1.72.36:80)


vrrp_instance VI_1 {
state MASTER
.................CUT.............
virtual_ipaddress {
10.1.72.38/16 dev eth2
10.1.72.36/16 dev eth2 #<========
}
}

virtual_server 10.1.72.36 80 { <===========
delay_loop 90
lb_algo rr
lb_kind FNAT
# persistence_timeout 50
.................CUT........
}

nginx.conf (nginx should handle 10.1.72.36:8080)

server {
listen 10.1.72.36:8080;

location / {
root html;
index index.html index.htm;

}

}

so virtual 10.1.72.36:80 is handled fine by LVS as expected.

but when I access 10.1.72.36:8080, since there is no virtual
configuration for 10.1.72.36:8080, I am hopping nginx will handle it,
but it appears LVS is handling it as LVS debug shows, but no SYN+ACK
back to the client, thus failed :

Nov 11 11:25:53 vincent-centos64-2 kernel: IPVS: lookup service: fwm 0
TCP 10.1.72.36:8080 not hit

Nov 11 11:25:53 vincent-centos64-2 kernel: IPVS: lookup TCP
10.1.72.6:36220->10.1.72.36:8080 not hit

Nov 11 11:25:53 vincent-centos64-2 kernel: IPVS: lookup TCP
10.1.72.6:36220->10.1.72.36:8080 not hit

if I stop keepalived, 10.1.72.36:8080 is handled by ngnix correctly,
or if I use uniq ip address as listener in keepalived and nginx, it
works as expected, for example 10.1.72.38:80 in keepalived,
10.1.72.36:8080 in nginx, it works.

so it looks I can't use same IP address in LVS and nginx as listener,
even with different port.

is there anyway to skip LVS handling when there is no 10.1.72.36:8080
in LVS configuration? the issue is somewhere else, not in LVS.

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