No Failover works, Failover does not work

[Glenn Satchell]

Hi Shlomo

I assume that since you mentioned that both servers work ok without
failover enabled they have valid leases in their dhcpd.leases file. In
this situation, when failover first starts up the two servers will wait
for mclt (1800 seconds in your config) to pass so that any temporary
leases will have expired.

So you have two choices:

1. Wait for 1800 seconds to pass, and things should magically just
start to work.

2. Replace the leases file on the secondary with an empty file. In this
situation the sceondary wikll transfer the leases over from the primary
and both will start to issue leases immediately.

The recovering situation occurs when both servers have leases, but
haven't previously synchronised to each other. Once synchronised they
will restart immediately.

regards,
-glenn

>Date: Wed, 17 May 2006 12:35:41 -0600
>From: Michael Loftis <mloftis at wgops.com>
>To: dhcp-users at isc.org
>Subject: Re: No Failover works, Failover does not work
>Content-Disposition: inline
>
>That's DHCPD stating it's in recovery mode.  IE *it* is recovering from a 
>failover mode or failure mode or jsut starting up...I *think* it'll clear 
>up on it's own after a little while depending upon your timeout settings.
>
>--On May 17, 2006 9:29:38 PM +0300 Shlomo Dubrowin <shlomo at dubrowin.org> 
>wrote:
>
>> OK, so I switched the peer ports to 519 and 520.
>> Now, when I try to get an address, these messages were recorded.
>> (Franklin is the primary DHCP Server, the MAC Address listed is my
>> machine, and the IP 10.153.22.1 is the router IP for the VLAN that is
>> configured as the relay agent.):*
>>
>> *messages:May 17 21:18:37 franklin dhcpd: DHCPDISCOVER from
>> 00:12:3f:1a:60:c3 via 10.153.22.1: not responding (recovering)
>> messages:May 17 21:18:42 franklin dhcpd: DHCPDISCOVER from
>> 00:12:3f:1a:60:c3 via 10.153.22.1: not responding (recovering)
>> messages:May 17 21:18:50 franklin dhcpd: DHCPDISCOVER from
>> 00:12:3f:1a:60:c3 via 10.153.22.1: not responding (recovering)
>> messages:May 17 21:19:06 franklin dhcpd: DHCPDISCOVER from
>> 00:12:3f:1a:60:c3 via 10.153.22.1: not responding (recovering)
>>
>> So which machine isn't responding?  the machine trying to get an address
>> (the MAC Address) or the cisco router with the IP?
>>
>>   Shlomo
>>
>> On 5/17/06, Shlomo Dubrowin <shlomo at dubrowin.org> wrote:
>>>
>>> OK, I can try that, the documentation I was following said they could be
>>> the same.  thanx.
>>>
>>>   Shlomo
>>>
>>>
>>> On 5/17/06, Karen Pachla < kpachla at umich.edu> wrote:
>>> >
>>> > Hi,
>>> >
>>> > On my configuration, I have primary's port at 519, secondary as 520
>>> >
>>> > Primary:
>>> >         port 519;
>>> >         peer port 520;
>>> >
>>> > Secondary:
>>> >         port 520;
>>> >         peer port 519;
>>> >
>>> >
>>> > On Wed, 2006-05-17 at 20:51 +0300, Shlomo Dubrowin wrote:
>>> >
>>> > > Primary Config:
>>> > > -----------------------
>>> > > failover peer "dhcp-failover" {
>>> > >         primary; # declare this to be the primary server
>>> > >         address 10.153.100.26;
>>> > >         port 520;
>>> > >         peer address 10.153.100.27;
>>> > >         peer port 520;
>>> > >         max-response-delay 30;
>>> > >         max-unacked-updates 30;
>>> > >         load balance max seconds 3;
>>> > >         mclt 1800;
>>> > >         split 128;
>>> > > }
>>> > >
>>> > > include "/etc/dhcpd.pools";
>>> > >
>>> > >
>>> > > Secondary Config:
>>> > > ----------------------------
>>> > > failover peer "dhcp-failover" {
>>> > >         Secondary; # declare this to be the secondary server
>>> > >         address 10.153.100.27;
>>> > >         port 520;
>>> > >         peer address 10.153.100.26;
>>> > >         peer port 520;
>>> > >         max-response-delay 30;
>>> > >         max-unacked-updates 30;
>>> > >         load balance max seconds 3;
>>> > >         mclt 1800;
>>> > > }
>>> >
>>> > --
>>> > K. Pachla
>>> > LSAIT
>>> > University of Michigan
>>> >
>>> >
>>> >
>>>
>>>
>>> --
>>> -----------------------------------------------------------------------
>>>
>>>   ,-~~-.___.    ._.
>>> / |  '     \   | |"""""""""|           Shlomo Dubrowin
>>> (  )         0  | |         |             (Sheldon)
>>> \_/-, ,----'   | |         |
>>>     ====        !_!--v---v--"
>>>     /  \-'~;      |""""""""|             shlomo at dubrowin.org
>>>    /  __/~| ._-""||        |          http://www.dubrowin.org
>>> =(  _____|_|____||________|
>>> -----------------------------------------------------------------------
>>>
>>
>>
>>
>> --
>> -----------------------------------------------------------------------
>>   ,-~~-.___.    ._.
>> / |  '     \   | |"""""""""|           Shlomo Dubrowin
>> (  )         0  | |         |             (Sheldon)
>> \_/-, ,----'   | |         |
>>     ====        !_!--v---v--"
>>     /  \-'~;      |""""""""|            shlomo at dubrowin.org
>>    /  __/~| ._-""||        |          http://www.dubrowin.org
>> =(  _____|_|____||________|
>> -----------------------------------------------------------------------
>>
>>
>>
>
>
>
>--
>"Genius might be described as a supreme capacity for getting its possessors
>into trouble of all kinds."
>-- Samuel Butler
>