[Dnsmasq-discuss] Disappearing hosts from local DNS resolution

[Eric Thibodeau]

Rune Kock wrote:
> Do you have any more information about this dhcpcd problem?  In
> particular, is it a bug that is present in version 3.2.3?
>   
I couldn't say, the cluster was running net-misc/dhcpcd-3.0.13 and then 
jumped to net-misc/dhcpcd-4.0.0_rc4 (thank god for emerge.log)....
> TIA
> Rune
>
>
> On Thu, Oct 9, 2008 at 22:02, Eric Thibodeau <kyron at neuralbs.com> wrote:
>   
>> Fixed, Roy noticed a discrepancy in the version of dhcpcd, I upgraded to
>> 4.0.2 and now my hosts have a longer lifespan ;)
>>
>> Eric
>>
>> Simon Kelley wrote:
>>     
>>> Eric Thibodeau wrote:
>>>       
>>>> Hello,
>>>>
>>>>   I am using dnsmasq as a core component of my cluster. I'm having a
>>>> weird problem where the nodes are disappearing (can't use hostnames
>>>> anymore). So I am forced to connect to them using the IP addr. and forcing
>>>> dhcpcd to request an IP for the hosts to reappear in dnsmasq. The logs show
>>>> the following on the disappeared hosts:
>>>>
>>>> Oct  1 15:29:41 headless dnsmasq[7726]: DHCPREQUEST(eth1) 10.0.1.11
>>>> 00:01:03:df:ca:44
>>>> Oct  1 15:29:41 headless dnsmasq[7726]: DHCPNAK(eth1) 10.0.1.11
>>>> 00:01:03:df:ca:44 lease not found
>>>> ...
>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPDISCOVER(eth1)
>>>> 00:01:03:df:ca:44
>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPOFFER(eth1) 10.0.1.11
>>>> 00:01:03:df:ca:44
>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPDISCOVER(eth2)
>>>> 00:01:03:df:ca:44
>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPOFFER(eth2) 10.0.1.11
>>>> 00:01:03:df:ca:44
>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPREQUEST(eth1) 10.0.1.11
>>>> 00:01:03:df:ca:44
>>>> Oct  1 15:29:42 headless dnsmasq[7726]: DHCPACK(eth1) 10.0.1.11
>>>> 00:01:03:df:ca:44 thinkbig1
>>>>
>>>>  Here are two significant lines from my config file:
>>>>
>>>> dhcp-range=AthlonXP_1,10.0.1.10,10.0.1.126,255.255.255.0,12h
>>>>
>>>> dhcp-host=00:01:03:df:ca:44,net:AthlonXP_1,thinkbig1,10.0.1.11
>>>>
>>>> As you can note, I am defining a range with a lease time of 12h but none
>>>> for the statically defined hosts. Could this be the reason the nodes
>>>> disappear (lease time not sent to nodes if it's not defined in the static
>>>> definition)?
>>>>         
>>> Not a problem, if the lease time is not given, it defaults to the value
>>> for the range.
>>>       
>>>> dnsmasq version is 2.45 and dhcpcd is 4.0.1-rc1
>>>>
>>>>         
>>> The reaon the host is not in DNS is because there is no lease for it in
>>> dnsmasq's lease database. The dhcp-host line tells dnsmasq what address to
>>> offer, but it's the existence of a lease that gets reflected into the DNS,
>>>
>>> Something is mangling your lease database, hence when the host tries to
>>> renew its lease:
>>>       
>>>> Oct  1 15:29:41 headless dnsmasq[7726]: DHCPREQUEST(eth1) 10.0.1.11
>>>> 00:01:03:df:ca:44
>>>> Oct  1 15:29:41 headless dnsmasq[7726]: DHCPNAK(eth1) 10.0.1.11
>>>> 00:01:03:df:ca:44 lease not found
>>>>         
>>>                    ^^^^^^^^^^^^^^^
>>>
>>> Are you doing something odd with the leases file?
>>>
>>> Simon.
>>>
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>>> Dnsmasq-discuss at lists.thekelleys.org.uk
>>> http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
>>>       
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