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Re: [lvs-users] The expiration time of persistent template in Backup dir

To: "lvs-users@xxxxxxxxxxxxxxxxxxxxxx" <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [lvs-users] The expiration time of persistent template in Backup director is updated to original value as long as packets are coming in Master Lunix director when enable connection synchronization
From: LIANG Sujun <Sujun.Liang@xxxxxxxxxxxxxxxxxx>
Date: Thu, 30 Mar 2017 08:49:11 +0000
Hi Dear,
I setup my LVS/NAT system by keepalived and it works. I configured the 
persistent timout as 360 seconds
I have one question when enable IPVS connection synchronization, I found the 
expiration time of persistent template in Backup director is updated to 
original value as long as packets are coming in Master Lunix director

Please see following example:


1.       On Master:
[root@0210-lvs-master ~]# ipvsadm -Lcn
IPVS connection entries
pro expire state       source             virtual            destination
UDP 04:54  UDP         10.195.52.11:5060  10.195.52.18:5060  192.168.0.4:5060
UDP 05:53  UDP         10.195.52.11:0     10.195.52.18:5060  192.168.0.4:5060


On backup:
[root@lvs-backup ~]# ipvsadm -Lcn
IPVS connection entries
pro expire state       source             virtual            destination
UDP 04:49  UDP         10.195.52.11:5060  10.195.52.18:5060  192.168.0.4:5060
UDP 05:50  UDP         10.195.52.11:0     10.195.52.18:5060  192.168.0.4:5060



2.       Send the traffic


3.       On Master


[root@0210-lvs-master ~]# ipvsadm -Lcn
IPVS connection entries
pro expire state       source             virtual            destination
UDP 05:00  UDP         10.195.52.11:5060  10.195.52.18:5060  192.168.0.4:5060
UDP 05:12  UDP         10.195.52.11:0     10.195.52.18:5060  192.168.0.4:5060



On Backup

[root@lvs-backup ~]# ipvsadm -Lcn
IPVS connection entries
pro expire state       source             virtual            destination
UDP 04:18  UDP         10.195.52.11:5060  10.195.52.18:5060  192.168.0.4:5060
UDP 06:00  UDP         10.195.52.11:0     10.195.52.18:5060  192.168.0.4:5060

You can see the expiration time of persistent template on backup director is 
updated to 6 min, and the expiration time won't also be synced, why the 
persistent timeout on backup is updated each time?

Is it by design?

Anyone can help to answer the question? Thanks in advance.


Thanks,
Sujun

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