[Feature request] Ability to serve expired records in the cache by type.
benno at NLnetLabs.nl
Wed May 10 18:13:34 UTC 2023
Not sure why prefetch option does not work for you without enabling
serve-expired. How did you test the prefetch option?
From the manual page:
prefetch: <yes or no>
If yes, message cache elements are prefetched before they expire to keep
the cache up to date. Turning it on gives about 10 percent more traffic
and load on the machine, but popular items do not expire from the cache.
Prefetch causes active queried cached items to be prefetched when they
are at 10% of their TTL. If the cache item is not queried during this
time, the item will expire.
For serve-expired feature, there are two alternatives available, see the
> On 8 May 2023, at 00:31, alpominth--- via Unbound-users
<unbound-users at lists.nlnetlabs.nl> wrote:
> Here in my tests, prefetch option only works when serve-expired is
> Here is one of my configuration files:
> interface: 127.0.0.1
> interface: ::1
> port: 53
> cache-max-ttl: 21600
> cache-min-ttl: 21600
> cache-max-negative-ttl: 21600
> val-bogus-ttl: 0
> infra-host-ttl: 21600
> prefetch: yes
> serve-expired: yes
> serve-expired-ttl: 2592000
> delay-close: 10000
> chroot: ""
> username: "permcache"
> directory: ""
> pidfile: ""
> do-not-query-localhost: no
> module-config: "validator cachedb iterator"
> backend: redis
> # redis-server-host: ::1
> # redis-server-port: 6379
> redis-server-password: "blah123"
> redis-server-path: "/opt/permcache/db/redis-server.sock"
> redis-timeout: 5000
> name: "."
> forward-addr: ::1 at 10053
> /\ Prefetch works, but the negative and host cache are cached for 1
month when prefetching is enabled, I would like to set a very short
caching time for them, 1 or 2 days.
> Options for controlling the expired host cache and negative cache
separately would be a very good idea, as negative and host entries would
have different TTLs.
> The options could be:
> serve-expired-negative-ttl: <seconds>
> serve-expired-infra-host-ttl: <seconds>
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