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Hello again,
Further investigation of this problem...
I saw a few posts concerning expire_nodest_conn, so I set that to 1.
'ipvsadm -Lcn' shows that connections aren't being expired, however.
When the service had fallen back to 127.0.0.1:80 and I had waited for
all connections to the VIP:80 to expire, and tried to connect to the
VIP:80 again, it still didn't work, and this was the output of 'ipvsadm
-Lcn|grep 10.0.0.1:80':
[root@lvs1 gwaugh]# ipvsadm -Lcn|grep 10.0.0.1:80
TCP 09:53 NONE 10.133.27.14:0 10.0.0.1:80 127.0.0.1:80
TCP 00:53 SYN_RECV 10.133.27.14:39133 10.0.0.1:80 127.0.0.1:80
(My workstation is 10.133.27.14.)
Could it be that ldirectord is not honouring expire_nodest_conn?
FYI, I did a 'service ldirectord restart' after 'echo 1 >
/proc/sys/net/ipv4/vs/expire_nodest_conn'.
Cheers,
Guy.
Guy Waugh wrote:
Hi folks,
I'm trying to set up a simple fallback server on the LVS director for a
port 80 apache service, such that if all the real servers for the apache
service are down, the service will fall back to apache on the director.
We run an LVS-NAT system with two real servers and about 30 active
apache virtual hosts.
I have this in my ldirectord.cf file (IPs changed to protect the innocent):
virtual=10.0.0.1:80
real=192.168.1.1:80 masq
real=192.168.1.2:80 masq
fallback=127.0.0.1:80 masq
quiescent=no
checktype=connect
service=none
scheduler=wlc
persistent=600
protocol=tcp
When apache on the real servers is shut down, 'ipvsadm -L' shows that
the service has fallen back to 127.0.0.1:80 (as do the ldirectord logs),
but I can't connect to the service - it says 'connection refused'. I'm
trying to connect from my workstation, and the connection works fine
when apache on the real servers is up and running.
When the service is in fallback mode, I can telnet to port 80 on
127.0.0.1 from the director, and a 'GET / HTTP/1.1' with a correct HTTP
Host: header works, so apache on the director is answering requests to
127.0.0.1 port 80. The problem seems to be that the LVS code isn't
handing the connection from my workstation off to 127.0.0.1:80 - it
doesn't in fact seem to be listening to connections at all.
Anyone have any ideas on what I could try?
PS Director is RHEL3, Ultramonkey 3.
Thanks,
Guy.
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--
Guy Waugh
Unix System Administrator
IT&TS, Southern Cross University
Lismore, NSW, Australia
Email: gwaugh@xxxxxxxxxx
Ph.: +61 2 6620 3196
Fax: +61 2 6620 3033
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