j.stubbs at linkthink
Jun 26, 2008, 5:53 PM
Post #3 of 3
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Re: [lvs-users] connection broken during two hours by using LVS as load balancer
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On Friday 27 June 2008 03:21:02 richard zhao wrote:
> Hello, All
> I developed a Client/Server program in which client will
> establish a persistent connection with Server and then client and
> server will maintain this connection for a very long time. this week, I
> use LVS as load balancer. I found that the connection between Client
> and Server are broken at the exact two hours. if I don't use the LVS,
> the connection never break under the same environment. For this LVS,
> the packet forwarding method is gatewaying, the scheduler which I tried
> is lblc, I also tried --persistent. they have same results. Does
> anyone have such experience? could anyone explain why that happened and
> tell me how to avoid. thank you very much in advance.
It sounds like the tcp session timeout, which is configurable with
ipvsadm --set. However, after a search I found the defaults in
ip_vs_proto_tcp.c in the kernel:
static int tcp_timeouts[IP_VS_TCP_S_LAST+1] = {
[IP_VS_TCP_S_NONE] = 2*HZ,
[IP_VS_TCP_S_ESTABLISHED] = 15*60*HZ,
[IP_VS_TCP_S_SYN_SENT] = 2*60*HZ,
[IP_VS_TCP_S_SYN_RECV] = 1*60*HZ,
[IP_VS_TCP_S_FIN_WAIT] = 2*60*HZ,
[IP_VS_TCP_S_TIME_WAIT] = 2*60*HZ,
[IP_VS_TCP_S_CLOSE] = 10*HZ,
[IP_VS_TCP_S_CLOSE_WAIT] = 60*HZ,
[IP_VS_TCP_S_LAST_ACK] = 30*HZ,
[IP_VS_TCP_S_LISTEN] = 2*60*HZ,
[IP_VS_TCP_S_SYNACK] = 120*HZ,
[IP_VS_TCP_S_LAST] = 2*HZ,
};
Established connections expire after 15 minutes of inactivity by default.
Unless your distribution has changed it of course... I'd experiment with
using ipvsadm --set to confirm that it is the issue. And if it is, I guess
the next question would be "is it possible to disable timeouts on
established session?" That, I don't know.
--
Jason Stubbs <j.stubbs [at] linkthink>
LINKTHINK INC.
東京都渋谷区桜ヶ丘町22-14 N.E.S S棟 3F
TEL 03-5728-4772 FAX 03-5728-4773
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