DHCP failover - disk full, can not commit to lease file

[Glenn Satchell]

Your monitoring system could always detect no disk free space and shut
down the dhcp service?

regards,
-glenn

On Tue, May 28, 2013 4:53 am, Louis Lau wrote:
> Dear all,
>
> I have two DHCP servers configured as failover peer and the router relay
> the DHCP/Bootp request to both server. When the system works normaly, a
> DHCP discover from client will be broadcast to both server and the
> observed behavour is that both server will offer an DHCP OFFER to the same
> client, The primary DHCP server shall reply an IP-A managed by the
> Primary, and the Secondary shall reply an IP-B that is managed by the
> secondary. Assume the client select IP-A and send an DHCP Request for IP-A
> to both server.
>
> However recently, primary server disk is full, and in the log there are a
> lot of
>
> ommit_leases: unable to commit: No space left on device
>
> We observed that the DHCP does not failover to the secondary in this case,
> and the primary will still response to DHCPDISCOVER and provide a DHCP
> Offer.  And in this case, we observed that most client does not try the
> DHCP offer from secondary but most of them choose the IP assigned from the
> Primary DHCP server.
>
> Is this behaviour normal?
>
> Are there any configuration that can make the server fail to secondary
> DHCP server for similar case or let the client try the other DHCP OFFER
> when the first DHCP IP does not have a ACK?
>
> Thanks for your help on this matter.
>
> Louis Lau
>
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