DNS problems solved

[Graeme Fowler]

On Fri, 2007-04-06 at 13:12 +0200, Simon Pearce wrote: 
> Some of you on the list might remember my problem concerning our DNS cluster last year.

Aye, I do. Phew, glad you solved it :)

> Which brought me to the solution ipvsadm -L --timeout the default settings for UDP
> packets was set to 500 seconds which should be changed. Which is way to long the
> load balancers were waiting for 5 minutes to timeout a UDP packet i get ablout 1500
> queries a second. I changed the setting to 15 seconds last week. And moved some of
> our old windows/bind DNS servers to the new linux DNS cluster. Before i changed the
> timeout settings i always recieved a call from our customers within two hours your
> DNS services are not responding correctly. The IP's that refused to answer would
> always change i have 254 IP's some of the large German dialup providers would refuse
> to talk to us which resulted in domains not being reachable. Our DNS cluster is
> autorative for about 250000 domains so you can imagine how many complaints i
> recieved. I was about to give up and scrap keepalived i am so glad i did not.
> Changing the timeout value solved my problems and i am a happy man at the moment.
> Is there a way to set the timeout value permently so it is saved after a reboot of
> the server?

How did you change the timeouts? Assuming you did "echo somevalue
>> /proc/sys/net/some_sysctl" then you could just transpose the
sysctl/value pair into /etc/sysctl.conf.

If you let us know how you set it, we should be able to help you set it
after a reboot :)

Graeme