[PowerDNS] Configure specific TTL for a zone

[AxelBomp]

Hello,

We would like to know if it is possible to configure a specific TTL for a DNS zone. PowerDNS seems to only consider the global parameter for all zones, as well as the TTLs specified when adding RRsets.

We need a TTL of 3600 for some zones, and a TTL of 300 for others. Modifying the TTL directly in the database does not work either...

Any ideas?

Thank you in advance!

[Habbie]

We need a TTL of 3600 for some zones, and a TTL of 300 for others. Modifying the TTL directly in the database does not work either...

What do you mean by this? Can you show what you did, what you got, and tell us how that differs from what you expected?

[AxelBomp]

Hi,

We recently migrated a zone from an old DNS server, where the default TTL was set to 300 seconds, so that all new records created in this zone would also have a TTL of 300 seconds automatically, without needing to specify it each time. We then tried to replicate this behavior on PowerDNS by setting a default TTL of 300 seconds for this specific zone, without changing the default TTL for other zones (which is 3600 seconds). This is where we encountered an issue.

Even when modifying the TTL field in the "records" table for the concerned zone, the value is not being taken into account. When we create a new record in this zone without specifying the TTL, it defaults to 3600 seconds, whereas we would like it to default to 300 seconds.

[Habbie]

how are you creating the new record?

[AxelBomp]

We use the pdnsutil add-record command:

sudo docker exec container pdnsutil add-record zone.com helloworld A 10.10.10.10

If we don't specify the TTL in this command, it's set by default to 3600s.

So is there a way to configure the zone.com at 300s by default in order to automatically have 300s on each record we add, without specifying the TTL in the add-record command?

We could modify the "default-ttl" parameter but it seems to be global and other zones would be impacted.

[miodvallat]

If you don't specify a ttl in your pdnsutil add-record command, the default ttl from the authoritative server configuration (default-ttl) is used, and if you didn't specify a value for it, its default value is... 3600. And yes, as you note, it will affect all zones.

There is currently no way in pdnsutil to reuse the SOA ttl for new records if you don't specify a ttl.

[AxelBomp]

Thanks for your answer. And by using the API ?

[miodvallat]

When using the API, providing the ttl is mandatory.

[AxelBomp]

Ok! Thanks again. :)