[Pdns-users] strange servfail

Thu Oct 29 20:32:48 UTC 2015

No, except for the aforementioned ' unknown dns type 
'hoofdluis.hoofdluis.nl' ' message which is probably why the queries 
fail but I am unable to track down where this error is coming from. I'm 
guessing Powerdns tries to build a query and decided something is wrong, 
but since it is never actually executed in the database it doesn't show 
up in the MySQL query logs.

Martijn

On 29-10-2015 21:22, Aki Tuomi wrote:
> When you get SERVFAIL, do you see anything in
> 
> /var/log/syslog or /var/log/messages
> 
> Aki
> 
> On Thu, Oct 29, 2015 at 09:11:16PM +0100, Martin wrote:
>> 
>> 
>> Hi,
>> 
>> Sure, one of the domains that is giving me trouble is hoofdluis.nl
>> 
>> - dnssec is disabled for this backend in Powerdns config
>> 
>> - here's a few lines from the 'records' table:
>> 
>> | id | domain_id | name | type | content | ttl | prio | change_date |
>> disabled | ordername | auth |
>> +-----+-----------+------------------------+------+------------------------------------------------------------------------+-------+------+-------------+----------+-----------+------+
>> | 349 | 38 | hoofdluis.nl | SOA | ns1.sonexo.eu info.sonexo.nl
>> 2015102902 10800 3600 604800 3600 | 86400 | 0 | 1446148124 | 0 | NULL 
>> |
>> 1 |
>> | 350 | 38 | hoofdluis.nl | NS | ns1.sonexo.eu | 86400 | 0 | 
>> 1446122706
>> | 0 | NULL | 1 |
>> | 351 | 38 | hoofdluis.nl | NS | ns2.sonexo.com | 86400 | 0 | 
>> 1446122706
>> | 0 | NULL | 1 |
>> | 352 | 38 | www.hoofdluis.nl | A | 185.27.174.120 | 86400 | 0 |
>> 1446122706 | 0 | NULL | 1 |
>> | 353 | 38 | hoofdluis.nl | A | 185.27.174.120 | 86400 | 0 | 
>> 1446122706
>> | 0 | NULL | 1 |
>> | 355 | 38 | localhost.hoofdluis.nl | A | 127.0.0.1 | 86400 | 0 |
>> 1446122706 | 0 | NULL | 1 |
>> 
>> - root at ns1:/etc/powerdns/pdns.d# pdnssec check-zone hoofdluis.nl
>> Checked 12 records of 'hoofdluis.nl', 0 errors, 0 warnings.
>> 
>> I should probably add that we are running two backends, both MySQL on
>> the same server, spread out over two different databases. One backend 
>> is
>> more advanced and uses custom queries and dnssec but has no records
>> whatsoever for any of the domains in the second backend, and vice 
>> versa.
>> Advanced backend is queried first, regular one next. It'd be easy to
>> point to this as the source of the problem but I cannot find any clue
>> that it is causing problems since MySQL queries are ok and the first
>> (more advanced) backend does not return any data at all for the domain
>> hoofdluis.nl so the second backend is definitely in control.
>> 
>> Martin
>> 
>> On 29-10-2015 20:39, Aki Tuomi wrote:
>> 
>> > Is it possible for you to provide actual data? Also,
>> > - have you turned on dnssec support? gmysql-dnssec=yes
>> > - can you provide the actual line(s) from mysql database
>> > - can you run pdnssec check-zone zone
>> >
>> > Aki
>> >
>> > On Thu, Oct 29, 2015 at 08:18:29PM +0100, Martin wrote:
>> > Hi, Thanks for your reply. I'm using Poweradmin and everything seems to be ok in the database, no mixup of types and content or anything. I forgot to add that if I query the authoritative nameserver for the domain directly, dig works as expected: dig a abc.example.com @ns1.mynsserver gives me the expected NXDOMAIN result. I have enabled MySQL query log and it appears that some queries are fired but somehow the requesting client is unable to determine who is authoritative or something. You see, when I use nslookup in debug mode this happens: ------------ QUESTIONS: abc.example.com, type = A, class = IN ANSWERS: AUTHORITY RECORDS: ADDITIONAL RECORDS: ------------ ** server can't find abc.example.com: SERVFAIL I would expect to at least get some authority records. Again, www.example.com [1]is working fine in nslookup & dig. Martin On 29-10-2015 18:12, bert hubert wrote: Hi Martin, You appear to have put domain names in the type field! The error messages say the type is
>> example.example.com. Bert On Oct 29, 2015 17:10, Martin 
>> <domains at crystalline.nl> wrote: Hi, I have setup a simple MySQL 
>> backend for a domain with a few MX records, a couple of A records, two 
>> NS records and a SOA record for the domain. All dig commands are run 
>> from a completely unrelated server: dig a www.example.com [1] [1] is 
>> working: it returns the right A record dig a example.com is working: 
>> it returns the right A record Now this is where things go wrong: dig a 
>> abc.example.com returns a SERVFAIL but I am expecting a NXDOMAIN 
>> response because there is no A record for abc.example.com I checked 
>> the PowerDNS logs and this is there: Oct 29 16:44:45 ns1 pdns[27687]: 
>> Exception building answer packet (Unknown DNS type 
>> 'example.example.com') sending out servfail Oct 29 16:44:45 ns1 
>> pdns[27687]: Exception building answer packet (Unknown DNS type 
>> 'example.example.com') sending out servfail Oct 29 16:44:45 ns1 
>> pdns[27687]: Exception building answer packet (Unknown DNS type
>> 'example.example.com') sending out servfail Oct 29 16:44:45 ns1 
>> pdns[27687]: Exception building answ
>>  er packet (Unknown DNS type 'example.example.com') sending out 
>> servfail
>> Oct 29 16:44:45 ns1 pdns[27687]: Exception building answer packet
>> (Unknown DNS type 'example.example.com') sending out servfail Five
>> messages with unknow dns type 'domain.domain.tld'. I have tried an
>> online tool like http://www.kloth.net/services/dig.php [3] [2] as well
>> and it generates the same error in the logs but only once instead of
>> five times. Can anyone point me in the right direction? I'm stumped. 
>> I'm
>> running the latest version on Debian. Thanks, Martin Links: ------ [1]
>> http://www.example.com [1] [2] http://www.kloth.net/services/dig.php 
>> [3]
>> 
>> 
>> > _______________________________________________ Pdns-users mailing list Pdns-users at mailman.powerdns.com http://mailman.powerdns.com/mailman/listinfo/pdns-users [2]
>> 
>> 
>> Links:
>> ------
>> [1] http://www.example.com
>> [2] http://mailman.powerdns.com/mailman/listinfo/pdns-users
>> [3] http://www.kloth.net/services/dig.php
> 
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