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Thanks for your kind answer.
and so sorry for my short explanation.
LVS1 and LVS2 has no relations with each other.
neither master and slave.
LVS1 is a system for A group and
LVS2 is a system for B group. and has no relations.
please confirm again...
>From: Horms <horms@xxxxxxxxxxxx>
>Reply-To: "LinuxVirtualServer.org users mailing
list."<lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
>To: "LinuxVirtualServer.org users mailing
list."<lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
>Subject: Re: [lvs-users] about "expire" timeout
>Date: Mon, 4 Jun 2007 16:34:55 +0900
>
>On Mon, Jun 04, 2007 at 05:29:42AM +0000, Monty Ree wrote:
> > Hello, all.
> >
> > I have operated two LVS-DR system like below.
> >
> > LVS1
> > LVS-DR : linux kernel 2.6.18
> > web server : linux kernel 2.6.18(apache+php)
> > loadbalancing : sh(source hashing)
> > at realserver : just a little FIN_WAIT, TIME_WAIT
> > apache KeepAlive : on
> >
> > LVS2
> > LVS-DR : linux kernel 2.6.21
> > web server : linux kernel 2.6.21(apache+java+php)
> > loadbalancing : sh(source hashing)
> > at realserver : lots of FIN_WAIT, TIME_WAIT
> > apache KeepAlive : on
> >
> > when I execute like below.
> >
> > # ipvsadm -L -n -c
> >
> > TCP 14:22 ESTABLISHED 221.155.xx.xx:1995 xxx.x.xx.xx:80
xxx.x.xx.xx:80
> > ~~~~
> > here, 14:22 means expire time, right?
>
>Yes.
>
> > at LVS1, after some seconds, above packets are disappeared.
> ^ connection entry
> > but LVS2, is not.
>
>If you are using connection syncrhonisation and LVS1 is the master
>and LVS2 is the backup, here is a rough sketch of what is likely
>to be going on.
>
>On LVS1 a connection is established and there is a series
>of packets going between the real-server and the end-user
>via the master linux-director. During this time the packets
>are tracked using a connection entry in the ESTABLISHED state.
>This has a time out of 15:00 minutes which is refreshed
>each time a packet is received. For the connection
>above that would seem to indicate that it has been idle for
>38 seconds.
>
>When the connection is shut down by either the real-server
>or the end-user, the connectino entry moves into the CLOSE
>state, with a much shorter timeout. If no more packets are
>received (which usually the case, typically, there will only be more
>packets if some arrive out of order), then the connection entry
>disappears pretty quickly.
>
>So far so good.
>
>On LVS2 things are a bit different. It doesn't see the packets
>sent by the real-server and the end-user. Rather it recieves
>connection information via the lvs sychronisation protocol.
>These are sent out by LVS1. They are sent out once a connection
>has seen 3 packets (the 3-way handshake is complete) and then
>every 50th packet. There is also a 2s delay loop in there,
>but thats not that important. It is this synchronisation information
>that produces the entries that you see on LVS2. And they may be a
>little out of date. But its not really that important, because
>they are just there in case fail-over occurs, so that LVS2
>will be able to forward packets for the connections that were
>syncrhized.
>
>The precices details of the timeouts and thes state of
>these synchronised connections is not that important,
>because while LVS2 is acting as a backup, they aren't used.
>So other than consuming a very small ammount of memory, they
>do no harm. And, if failover occurs, then the entries that
>are used at that time are updated and follow the rules that
>LVS1 was previously following. Just think of them as templates
>with a timeout, rather than full fledged connection entries.
>
> >
> > What's the difference?
> >
> > and at LVS2, when I connecting using F5(reload),
> > I can see over 600 connections, but LVS1 only 5-8 connections.
> >
> > Is it a kernel problem?
>
>Probably not.
>
>--
>Horms
> H: http://www.vergenet.net/~horms/
> W: http://www.valinux.co.jp/en/
>
>
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