On 17/10/2020 20:54, Nicholas Williams wrote:
First, the concern. I run MySQL in master/slave replication mode. I have a master MySQL server that I write to, and the PowerDNS servers connect to the slaves, not the master. Is there some way to tell PowerDNS to send updates to the master, or will I have to change one of the servers to connect to the master and explicitly send updates only to that server?
For DDNS updates, you'd need a powerDNS server which talks to the master. It can be hidden from the rest of the Internet, and you can use forward-dnsupdate <https://docs.powerdns.com/authoritative/dnsupdate.html#dnsupdate-configuration-options> on the slaves to forward to the master.
There is a howto for the ISC dhcp server here: https://docs.powerdns.com/authoritative/dnsupdate.html#dns-update-how-to-setup-dyndns-rfc2136-with-dhcpd
It is of course moot if VyOS doesn't support DDNS updates: e.g. https://forum.vyos.io/t/dhcp-service-and-dns-updates/245 (but the last post was from 2016)
Second, my question: Is there anyway to customize the queries that PowerDNS uses to update the records? Specifically, I would like to add a flag to records that were added or updated with Dynamic DNS so that my administrative console can differentiate between those and explicit records.
If the master server is *only* handling DDNS updates, then you should be able to customise the query appropriately.
https://doc.powerdns.com/authoritative/backends/generic-sql.html#specifying-queries
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