Dump cache values

unbound-control dump_cache 

Installation :
(https://memo-linux.com/debian-installer-le-serveur-dns-unbound/)

apt install unbound
cd /var/lib/unbound/ 
wget ftp://ftp.internic.net/domain/named.cache
mv named.cache root.hints && chown unbound:unbound root.hints
mv /etc/unbound/ 
unbound.conf.d/root-auto-trust-anchor-file.conf root-auto-trust-anchor-file.conf.original
mkdir /var/log/unbound
chown unbound: /var/log/unbound
# modify apparmor (see at the end)
systemctl restart unbound

Configuration file:

server:
statistics-interval: 0
extended-statistics: yes
statistics-cumulative: yes
verbosity: 3
interface: 127.0.0.1
port: 53
do-ip4: yes
do-ip6: yes
do-udp: yes
do-tcp: yes
access-control: 127.0.0.0/8 allow ## j'autorise mon serveur
access-control: 0.0.0.0/0 refuse ## j'interdis tout le reste de         l'Internet !
auto-trust-anchor-file: "/var/lib/unbound/root.key"
root-hints: "/var/lib/unbound/root.hints"
hide-identity: yes
hide-version: yes
harden-glue: yes
harden-dnssec-stripped: yes
use-caps-for-id: yes
cache-min-ttl: 3600
cache-max-ttl: 86400
prefetch: yes
num-threads: 6
msg-cache-slabs: 16
rrset-cache-slabs: 16
infra-cache-slabs: 16
key-cache-slabs: 16
rrset-cache-size: 256m
msg-cache-size: 128m
so-rcvbuf: 1m
unwanted-reply-threshold: 10000
do-not-query-localhost: yes
val-clean-additional: yes
#use-syslog: yes
#val-log-level:2 (0: default, nothing, 2: full)
logfile: /var/log/unbound/unbound.log
harden-dnssec-stripped: yes
cache-min-ttl: 3600
cache-max-ttl: 86400
prefetch: yes
prefetch-key: yes

And an additional apparmor configuration to be able to write in a dedicated file :
(https://b4d.sablun.org/blog/2018-09-27-when-unbound-wont-write-logs/)

vim /etc/apparmor.d/local/usr.sbin.unbound

# Site-specific additions and overrides for usr.sbin.unbound.
# For more details, please see /etc/apparmor.d/local/README.
/var/log/unbound/unbound.log rw,