[Pdns-users] strange servfail

Thu Oct 29 20:22:06 UTC 2015

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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