shell-things/etc/unbound/unbound.conf.d/cache.conf

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# Increasing caching
# This has potential to increase memory usage to 110m under heavy usage, but
# I find that unlikely as almost everything is using so short TTLs
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# See also MEMORY CONTROL EXAMPLE in man unbound.conf
server:
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# bytes in message cache, defaults to 4m
msg-cache-size: 50m
# bytes in rrset cache, defaults to 4m
rrset-cache-size: 50m
# nxdomain cache, default 1m
neg-cache-size: 10m
# Cache results for 15 minutes even if they had a shorter TTL. Cloudflare
# zone export used to have 1 second, and I have also been seeing 1
# minute in the wild, I think 5 mins shouldn't break anything, but bigger
# might.
cache-min-ttl: 900
# Update cache for popular items before they expire. ~10 % traffic
# increase according to `man unbound.conf`
prefetch: yes
# Fetch keys when DS is encountered, lower latency for a bit higher CPU use
prefetch-key: yes
# Allow expired results to be served if they are in cache. The cache will
# get updated the next time.
serve-expired: yes