[Pdns-users] PDNS recursor cache sync

Otto Moerbeek otto at drijf.net
Sat Sep 17 14:43:52 UTC 2022


cachs syncing is not something we have and even with it (or using a
single resolver) there is an issue that records can change:
the scenario: 

	- a client asks the record, record gets cached
	- client A asks and gets cached value,
	- publisher of records changes the record
	- record expires from cache
	- client B (firewall) asks and record resolves to different value.

On Sat, Sep 17, 2022 at 01:01:09AM +0100, Djerk Geurts via Pdns-users wrote:

> Just ran into an issue with recursive DNS servers where the two servers have cached a different A record for mirror.centos.org.
> This is a problem as the firewalls permit access to the FQDN, which presumes that both the client and the firewall end up with the same A record for the domain.
> I'm intending to swap these recursors out with PowerDNS servers, but am wondering if there's a way to keep the record cache in sync between multiple recursors.
> ⁣--
> Best regards,
> Djerk Geurts
> m: +44-7535-674620
> Maizymoo Ltd
> VAT No: GB192 1529 07
> Registration Number: 6638104 (registered in England and Wales)​

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