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On 31/05/2012 12:43, Graeme Fowler wrote:
> On Thu, 2012-05-31 at 12:21 +0200, Brent Clark wrote:
>> Im writing to you because we have a two node cluster setup with just
>> apache2, heartbeart and LVS, and every now and then find that ksoftirqd/0
>> runs at a 100%. We find that the only way to fix it, is to actually reboot
>> the server.
> <snip>
>> Let me know what you think, if someone could assist, it would be appreciated.
>
> I would hazard a guess that at the time you have this issue you have
> packets being "reflected" between the IPVS frameworks on both hosts.
>
Hi Graeme
Thank you so much for replying.
Sorry I should have stated upfront that, our setup is not active/active.
Heartbeat manages and stops and starts ldirectord.
Just to show you.
bclark@host-web01:~$ cat /etc/ha.d/haresources
hostcommentedout \
ldirectord::ldirectord.cf \
LVSSyncDaemonSwap::master \
IPaddr2::1.2.3.4/27/eth0/1.2.3.0
So the idea is. Heartbeat manages the Virtual IP (vip), and the active server
goes down for what ever reason (be it crash, or reboot), on the passive server,
the heartbeat daemons sees that its pair is dead, and then brings up the vip.
Thats just managing the "vip" side of things. Then on top of this, we use LVS
to load balance all HTTP, between both servers to share the HTTP traffic. But
only one instance of LVS runs at a time on the active server.
Its actually a very busy server. Easily in one of the top twenty sites here in
South Africa.
We have actually found that this problem has arised since we upgrade to Debian
Squeeze. Debian Lenny, was no problems.
The only slight configuration change was the introduction of adding a third
webserver (no heartbreat of LVS runs on this server), to the setup. Else the
configurations have not been chanced in years.
Thanks
Brent
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