Logs begin at Mon 2021-01-11 23:26:05 GMT, end at Mon 2021-01-11 23:36:01 GMT
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Jan 11 23:32:38 DietPi systemd[1]: Starting Unbound DNS server...
Jan 11 23:32:38 DietPi package-helper[1458]: /var/lib/unbound/root.key does notexist, copying from /usr/share/dns/root.key
Jan 11 23:32:38 DietPi package-helper[1458]: /var/lib/unbound/root.key has content
Jan 11 23:32:38 DietPi package-helper[1458]: success: the anchor is ok
Jan 11 23:32:38 DietPi unbound[1463]: [1610407958] unbound[1463:0] error: can'tbind socket: Address already in use for ::1 port 53
Jan 11 23:32:38 DietPi unbound[1463]: [1610407958] unbound[1463:0] fatal error:could not open ports
Jan 11 23:32:38 DietPi systemd[1]: unbound.service: Main process exited, code=exited, status=1/FAILURE
Jan 11 23:32:38 DietPi systemd[1]: unbound.service: Failed with result 'exit-code'.
Jan 11 23:32:38 DietPi systemd[1]: Failed to start Unbound DNS server.
Jan 11 23:32:38 DietPi systemd[1]: unbound.service: Service RestartSec=100ms expired, scheduling restart.
Jan 11 23:32:38 DietPi systemd[1]: unbound.service: Scheduled restart job, restart counter is at 1.
Jan 11 23:32:38 DietPi systemd[1]: Stopped Unbound DNS server.
--More--
root@DietPi:~# ls -la /etc/unbound/unbound.conf.d/
total 24
drwxr-xr-x 2 root root 4096 Jan 11 23:32 .
drwxr-xr-x 3 root root 4096 Jan 11 23:32 ..
-rw-r--r-- 1 root root 32 Jan 11 23:32 dietpi-pihole.conf
-rw-r--r-- 1 root root 1274 Jan 11 23:32 dietpi.conf
-rw-r--r-- 1 root root 302 May 25 2020 qname-minimisation.conf
-rw-r--r-- 1 root root 190 May 25 2020 root-auto-trust-anchor-file.conf
root@DietPi:~# cat /etc/unbound/unbound.conf
# Unbound configuration file for Debian.
#
# See the unbound.conf(5) man page.
#
# See /usr/share/doc/unbound/examples/unbound.conf for a commented
# reference config file.
#
# The following line includes additional configuration files from the
# /etc/unbound/unbound.conf.d directory.
include: "/etc/unbound/unbound.conf.d/*.conf"
usually there is no need to follow any guide. dietpi-software should have set everything correctly. Probably the only thing needed to simply save DNS settings again inside PiHole.