Drop a specific rrset from cache?

Felipe Gasper felipe at felipegasper.com
Fri Aug 2 18:27:29 UTC 2019


	I’d like to implement something to detect changes to an RRSET. What I have is (pseudocode):

ctx = ub_ctx_create();

while (1) {
    result = ub_ctx_resolve("example.com", "TXT");


	What I’m finding is that, because of libunbound’s caching, I’m getting the same result even long after changes have propagated to all of the relevant authoritative nameservers. If I set the “cache-max-ttl” option to 0 the problem goes away, but then I lose *all* caching, which I don’t want.

	Is there a way to make libunbound forget/drop a _specific_ query’s result from its cache?

	Thank you!

-Felipe Gasper
Mississauga, Ontario

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