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 <[EMAIL PROTECTED]> >Reply-To: "LinuxVirtualServer.org users mailing list."<[email protected]> >To: "LinuxVirtualServer.org users mailing list."<[email protected]> >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/ > > >_______________________________________________ >LinuxVirtualServer.org mailing list - [email protected] >Send requests to [EMAIL PROTECTED] >or go to http://lists.graemef.net/mailman/listinfo/lvs-users _________________________________________________________________ 특별한 누군가를 찾고 싶다면 MSN 친구사귀기! http://match.kr.msn.com/channel/index.aspx?trackingid=1002127 _______________________________________________ LinuxVirtualServer.org mailing list - [email protected] Send requests to [EMAIL PROTECTED] or go to http://lists.graemef.net/mailman/listinfo/lvs-users
