[Pdns-users] Master and slave cannot synchronize problems

Brian Candler b.candler at pobox.com
Mon Mar 11 11:59:38 UTC 2019

On 11/03/2019 11:41, 姜伯洋 wrote:
> I always see this error on the API monitoring page of the 8081.

In the private E-mail you sent, you included the image:

"Unable to queue notification of domain 'test.org': nameservers do not 

There's your error.  Your master authoritative server needs access to a 
working DNS cache in order to send notifications to the hosts listed in 
NS records.  By default it will be doing this via /etc/resolv.conf

Unfortunately I don't think it's possible to point /etc/resolv.conf to a 
nameserver other than on port 53.  But you can instead use the "resolver 
<https://doc.powerdns.com/authoritative/settings.html#resolver>" option 
to point it to your local recursor on port 5300.

You will make your life much, much easier if you have a separate 
recursor.  Even simpler, just remove the recursor from all your 
authoritative servers, and in /etc/resolv.conf point to a public caching 
server such as / /

(By "much, much easier", I mean that it's extremely hard to administer a 
Linux system if /etc/resolv.conf is not pointing to a working caching 
nameserver, so you need to fix that anyway)

On a separate point: if you are using mysql for your backend, you can 
simply use mysql replication between your hosts; this works very 
reliably and avoids a load of potential problems with master-slave zone 


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