Memory footprint of dhcpd process steadily increasing
Leif Arne Neset
leifa at alfanett.no
Wed Apr 1 07:58:19 UTC 2009
sthaug at nethelp.no skrev:
>> Two of our dhcp servers failed with "out of memory" messages:
>>
>> Mar 30 07:39:17 DHCP-SERVER out of memory [8971]
>> Mar 30 07:39:19 DHCP-SERVER last message repeated 42 times
>>
>> (two hours later the second server in the active/active failover
>> relationship had the same problem)
>>
>> It seems the dhcpd process' memory footprint is steadily increasing
>> until the system runs out of memory and dhcpd dies. We do use OMAPI but
>> we run version 3.1.1 which fixes that related memory leak. I found one
>> other mention of this problem posted by Steinar Haug:
>
> Yes, this is still an unsolved problem. We restart our DHCP servers
> regularly, to work around the problem.
>
> It would be good to know what could be done to get this problem higher
> up on the priority list.
>
We have the same problem at Fedora and ISC release 3.0.4rc1 and about
150.000 active leases. It seems to be related to DHCPDISCOVER/DHCPOFFER
packets. If we have one or more clients sending a lot of DHCPDISCOVER
(somewhere in the number of 10-100 DHCPDISCOVER every sec.) and the
client is ignoring the DHCPOFFER packets the memory usage of the dhcpd
process increases rapidly.
Leif Arne Neset
leifa at alfanett.no
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