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
# See also MEMORY CONTROL EXAMPLE in man unbound.conf
server:
# 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
# Increases TTL of all queries to 900 seconds (5 minutes) if upstream has
# a lower one. I have been using this since August 2019 without issues.
#cache-min-ttl: 900
# https://blog.apnic.net/2019/11/12/stop-using-ridiculously-low-dns-ttls/
# dares setting the minimum cache to something between 40 minute and 60,
# so how about 50 minutes? However it predates RFC 8767.
#cache-min-ttl: 3000
# Why not just make it hour directly, while that is considered as a
# maximum reasonableish value?
cache-min-ttl: 3600
# 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
# Serve expired data up to one day (RFC 8767)
serve-expired-ttl: 86400
# If serving expired data to client, explicitly give it TTL 30 seconds
serve-expired-reply-ttl: 30
# Serve expired data to client if there is no answer in 1.8 seconds as per
# common timeout 2 seconds according to the RFC 8767
#serve-expired-client-timeout: 1800
# However my /etc/resolv.conf timeout is 1 second since all my nameservers
# are localhost, so let's wait 0.8 seconds instead.
serve-expired-client-timeout: 800
# DNSSEC errors for valid and expired records
ede: yes
ede-serve-expired: yes
# vim: filetype=unbound.conf