2 dhcpd Instances on Same Platform? Take 2
jw354 at cornell.edu
Thu Feb 22 14:22:03 UTC 2007
> I'm curious as to why you have MCLT issues when restarting the servers.
> I have run several large sites with failover, and we always used the
> procedure to stop and then start the secondary. Wait for it to sync
> (usually only a few seconds), then stop and start the primary. Both
> servers continue to hand out leases with the normal lease times after
> restarting this way.
> By normal I mean that the initial lease offered to a client is MCLT and
> then subsequently it goes to the default lease time. But unless a
> client tries to renew during the few seconds the server was shutdown
> things operate normally. In fact if the client tries to renew when the
> server is down, it will usually retry a short time later and because
> the server is back up, things keep on working.
> And it's good to see someone so dedicated to a project. Wow! 1993 must
> havc been pre1.0 code... Way to go.
We also restart our servers frequently, careful to do the two servers
and see no such problems. We reconfigure the server "while you wait"
to a maximum
frequency of once every two minutes. This exercises the daemons'
ability to handle
stops/starts to a high degree. Size wise, we have 60,000 statically
clients, and 33,000 dynamic addresses, of which perhaps 4,000 might
be active at busy times.
We see a very small number of leases become inconsistent between the
two servers, and remain that way for days, but generally, the setup
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