Recovering from loss of leases.dhcpd on secondary of failover pair

[Nick Urbanik]

Dear Folks,

On 13/01/08 00:39 +1100, Glenn Satchell wrote:
>>From: Nick Urbanik <nicku at nicku.org>
>>On 12/01/08 22:06 +1100, Nick Urbanik wrote:
>>> This does not seem right.  I see none of the usual evidence of
>>> rebalancing in the logs.  Can anyone suggest some way to trigger the
>>> two machines to balance their leases?
>>
>>Do you think that I might cause any problems by restarting the
>>secondary while it is in recover state, and the primary is in partner
>>down state?
>
>My experience of shutting down the secondary, putting the primary
>into partner down, and then starting the secondary is that the
>primary immediately moves out of partner down mode. Now this was
>without starting with an empty dhcpd.leases file, so it might behave
>somewhat differently.
>
>Are you sure communication is working between the two dhcp servers?

There is quite a bit of communication happening on the failover port;
I count 3915 packets on that port measured (both directions) on the
primary from 00:08:11.886681 to 00:19:40.265044, and 4092 packets in
both directions measured on the failover port on the secondary from
00:07:50.833351 to 00:19:48.767101.

>What messages, if any, are there in the log files?

The log file on the secondary acknowleges requests for private
addresses for the cable modems, and for the most part, says things
like this for the PC requests:
dhcpd: DHCPREQUEST for 210.49.177.9 (211.31.132.45) from 00:0d:88:04:5f:b7 via 220.237.136.1: not responding (recovering)
There are lots of "peer holds all free leases" in the secondary log.

The number of PC leases in the secondary lease file is only:
active: 1028, free: 954
active: 4125, backup: 327, free: 608

whereas on the primary, we have:

UNKNWON: abandoned: 1, active: 13787, backup: 26867, expired: 1, free: 7472
abandoned: 1, active: 3837, backup: 359, expired: 2, free: 608
abandoned: 1, active: 3859, backup: 333, expired: 2, free: 612
active: 4569, backup: 448, expired: 4, free: 798
active: 4533, backup: 483, expired: 5, free: 798
active: 5957, backup: 474, expired: 3, free: 903
active: 2992, backup: 274, free: 529
active: 3068, backup: 257, free: 470
abandoned: 1, active: 2004, backup: 911, expired: 9, free: 1375, released: 1
active: 2962, backup: 270, free: 563
active: 2319, backup: 1689, expired: 6, free: 2309, released: 1
active: 1718, backup: 802, expired: 1, free: 1021
active: 877, backup: 361, free: 540
active: 4318, backup: 500, free: 748
abandoned: 2, active: 4740, backup: 499, expired: 4, free: 827
abandoned: 1, active: 2853, backup: 1060, expired: 5, free: 1394
backup: 465
active: 3341, backup: 365, free: 595
active: 5481, backup: 391, expired: 9, free: 697
active: 3496, backup: 351, free: 706
active: 3757, backup: 377, expired: 10, free: 663
active: 3188, backup: 331, free: 529
active: 3268, backup: 376, free: 657
active: 1021, backup: 197, free: 300
active: 2496, backup: 300, free: 493
backup: 791
active: 4945, backup: 353, expired: 5, free: 769
abandoned: 2, active: 5176, backup: 541, expired: 5, free: 853, released: 1
abandoned: 1, active: 5776, backup: 467, free: 839
abandoned: 1, active: 5898, backup: 427, expired: 3, free: 754, released: 1
active: 4891, backup: 515, expired: 4, free: 915
active: 5020, backup: 418, free: 887
active: 4064, backup: 327, free: 669

>What version of dhcpd?

3.0.4
-- 
Nick Urbanik   RHCE         http://nicku.org        nicku at nicku.org
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