Re: [Pdns-users] DNS UPDATE failing (Failed PreReqqisites check)

Mon, 04 Feb 2019 02:45:41 -0800 

On 2019-02-04 10:40, MRob wrote:

On 2019-02-04 10:21, Ruben d'Arco wrote:

Hi MRob,

The DNS Update specification (RFC2136) has a section that allows a DNS
update to do check (pre-requisites) before applying the update.
PDNS performs these checks, and it seems that the current records of
your domain do not comply with those pre-requisites.
Is there a set of things I should check for the records or the dns update? 





Can you show us the records from your domain and the dns update that
you're sending?


Thank you for responding. I will try first to upgrade pdns version as
Remi said. If I need send dns update command for inspection is the
best way to capture it using tcpdump? I'll send current domain records
also, but it's nothing, just the SOA. Do I need a SOA for reverse DNS
too?




On Mon, Feb 04, 2019 at 10:11:39AM +0000, MRob wrote:

Trying to use DNS updates but seeing the error in our logs "Failed
PreReqqisites check, returning 6". Could someone explain what "prerequisites 
check" is and what can cause it to fail? What things should I check?

Here is pdns log from one instance
Feb  3 03:20:17 test pdns[20989]: Query: begin
Feb  3 03:20:17 test pdns[20989]: Query: SELECT
content,ttl,prio,type,domain_id,disabled,name,auth FROM records WHERE
disabled=0 and name=?
Feb 3 03:20:17 test pdns[20989]: UPDATE (50855) from 10.10.1.254 for lan.: 
Failed PreRequisites check, returning 6
Feb  3 03:20:17 test pdns[20989]: Query: rollback

Here is sql log from same time, seems normal:
2019-02-03T08:20:17.424815Z   16 Reset stmt
2019-02-03T08:20:17.424946Z 16 Execute SELECT id FROM domains WHERE 
id = -1 OR name = 'lan'
2019-02-03T08:20:17.425130Z   16 Reset stmt
2019-02-03T08:20:17.425226Z   16 Execute        select
id,name,master,last_check,notified_serial,type,account from domains where 
name='lan'
2019-02-03T08:20:17.425418Z   16 Reset stmt
2019-02-03T08:20:17.425540Z   16 Execute        SELECT
content,ttl,prio,type,domain_id,disabled,name,auth FROM records WHERE
disabled=0 and type='SOA' and name='lan'
2019-02-03T08:20:17.425853Z   16 Reset stmt
2019-02-03T08:20:17.425987Z   16 Query  begin
2019-02-03T08:20:17.426196Z   16 Execute        SELECT
content,ttl,prio,type,domain_id,disabled,name,auth FROM records WHERE
disabled=0 and name='wrkstn12.lan'
2019-02-03T08:20:17.426370Z   16 Reset stmt
2019-02-03T08:20:17.426411Z   16 Query  rollback
Version is 4.0.0-alpha2 from repo where nothing newer available. Would it be productive to use repo supplied by powerdns.com, I mean is it possible a bug is in this version and has been fixed. Or is pdns innocent and problem with 
the DDNSUPDATE client?
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