Model B+
OS: RaspberryPi OS until it was full of crap undebugable - then ArclinuxARM … but ArchARM guys removed armhf architecture, very MS®© style (clap) so back to PiOS Lite
Installed with Pi-Hole and unbound as recursive DNS on port 5335 Interface: http://192.168.1.10/admin pass in bitwarden
SSHKeys on root

Start fdisk to partition the SD card:

fdisk /dev/mmcb1k0 

thank you systemD for shit naming Delete old partitions and create a new one:
Type o. to clear out any partitions
Type p to list & check partitions.
Type n for new, p for primary, 1 for the first partition , press ENTER to accept the default first sector, type +200M for the last sector.
Type t for type, type c to set the first partition to type W95 FAT32 (LBA).
Type n for new, p for primary, 2 for the second partition on the drive, and then press ENTER twice to accept the default first and last sector.
Write the partition table and exit by typing w.

cd /root
mkfs.vfat /dev/mmcb1k0p1
mkdir boot
mount /dev/mmcb1k0p1 boot
 
mkfs.ext4 /dev/mmcb1k0p2
mkdir root
mount /dev/mmcb1k0p2 root
 
curl -O http://os.archlinuxarm.org/os/ArchLinuxARM-rpi-latest.tar.gz
bsdtar -xpf ArchLinuxARM-rpi-latest.tar.gz -C root
sync
 
mv root/boot/* boot
 
umount boot root

First boot:

ssh alarm@IP #passwd alarm
su # pass root
pacman-key --init
pacman-key --populate archlinuxarm
passwd

pacman -Syu
pacman -S htop ccze dfc zsh vim base-devel git go #go for yay

hostnamectl set-hostname dns

vi /etc/systemd/network/20-wired.network

[Match]
Name=eth0
 
[Network]
Address=192.168.1.10/24
Gateway=192.168.1.1
DNS=192.168.1.11

 pacman -R vi
ln -s `which vim` /usr/bin/vi

Let's install yay

su - alarm
mkdir /tmp/yay
curl https://aur.archlinux.org/cgit/aur.git/plain/PKGBUILD?h=yay > /tmp/yay/PKGBUILD
cd /tmp/yay
makepkg
su
pacman -U yay*.xz

as user alarm

alarm@dns2 ~]$ yay -S pi-hole-server
:: Checking for conflicts...
:: Checking for inner conflicts...
[Repo:10]  libidn-1.38-1  bc-1.07.1-4  inetutils-2.2-1  logrotate-3.18.1-1  libmaxminddb-1.6.0-1  lmdb-0.9.29-1  python-3.9.9-1  python-ply-3.11-8  bind-9.16.23-1  lsof-4.94.0-1
[Repo Make:6]  hicolor-icon-theme-0.17-2  jsoncpp-1.9.4-1  libnsl-2.0.0-1  libuv-1.42.0-1  rhash-1.4.2-1  cmake-3.22.1-1
[Aur:2]  pi-hole-ftl-5.11-1  pi-hole-server-5.6-4
 
==> Remove make dependencies after install? [y/N]
  2 pi-hole-ftl                              (Build Files Exist)
  1 pi-hole-server                           (Build Files Exist)
==> Packages to cleanBuild?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> A
:: Deleting (1/2): /home/alarm/.cache/yay/pi-hole-ftl
:: Deleting (2/2): /home/alarm/.cache/yay/pi-hole-server
:: (1/2) Downloaded PKGBUILD: pi-hole-ftl
:: (2/2) Downloaded PKGBUILD: pi-hole-server
  2 pi-hole-ftl                              (Build Files Exist)
  1 pi-hole-server                           (Build Files Exist)
==> Diffs to show?
==> [N]one [A]ll [Ab]ort [I]nstalled [No]tInstalled or (1 2 3, 1-3, ^4)
==> N

coffee time
the compilation used to break @ 33%

....
[ 31%] Built target api
[ 32%] Building C object src/database/CMakeFiles/sqlite3.dir/shell.c.o
[ 33%] Building C object src/database/CMakeFiles/sqlite3.dir/sqlite3.c.o
/home/alarm/.cache/yay/pi-hole-ftl/src/FTL-5.11/src/database/sqlite3.c: In function 'dbpageUpdate':
/home/alarm/.cache/yay/pi-hole-ftl/src/FTL-5.11/src/database/sqlite3.c:206560:31: warning: comparison of integer expressions of different signedness: 'Pgno' {aka 'unsigned int'} and 'int' [-Wsign-compare]
206560 |   if( pgno<1 || pBt==0 || pgno>(int)sqlite3BtreeLastPage(pBt) ){
       |                               ^
^[[{standard input}: Assembler messages:{standard input}:480061: Warning: end of file not at end of a line; newline inserted{standard input}: Error: open CFI at the end of file; missing .cfi_endproc directive
cc: fatal error: Killed signal terminated program cc1
compilation terminated.make[2]: *** [src/database/CMakeFiles/sqlite3.dir/build.make:90: src/database/CMakeFiles/sqlite3.dir/sqlite3.c.o] Error 1make[1]: *** [CMakeFiles/Makefile2:322: src/database/CMakeFiles/sqlite3.dir/all] Error 2make: *** [Makefile:136: all] Error 2==> ERROR: A failure occurred in build().

Looks like the issue is the lack of memory to using https://docs.rackspace.com/support/how-to/create-a-linux-swap-file/ I added one GB of swap on /mnt

fallocate -l 1G /mnt/1GB.swap
dd if=/dev/zero of=/mnt/1GB.swap bs=1024 count=1048576
chmod 600 /mnt/1GB.swap
echo "vm.swappiness=10" > /etc/sysctl.conf
mkswap /mnt/1GB.swap
swapon /mnt/1GB.swap
 
echo "/mnt/1GB.swap  none  swap  sw 0  0" >>/etc/fstab

Once installed, start/enable pihole-FTL service

systemctl start pihole-FTL

It will fail silently thanks to SystemD and its systemd-resolved.service…

 vi /etc/systemd/resolved.conf

[Resolve]
DNSStubListener=no

Restart both…

 systemctl restart systemd-resolved pihole-FTL

• Install

   yay -S php-sqlite

• /etc/php/php.ini

  [...]
  extension=pdo_sqlite
  [...]
  extension=sockets
  [...]
  extension=sqlite3
  [...]

 yay -S lighttpd php-cgi
cp /usr/share/pihole/configs/lighttpd.example.conf /etc/lighttpd/lighttpd.conf
systemctl enable --now lighttpd

 vi /etc/hosts

127.0.0.1              localhost
192.168.1.10   pi.hole dns

Let's install a real recursive DNS

yay -S unbound

→ https://docs.pi-hole.net/guides/dns/unbound/
In /etc/unbound/unbound.conf

server:
    # If no logfile is specified, syslog is used
    # logfile: "/var/log/unbound/unbound.log"
    verbosity: 0
 
    interface: 127.0.0.1
    port: 5335
    do-ip4: yes
    do-udp: yes
    do-tcp: yes
 
    # May be set to yes if you have IPv6 connectivity
    do-ip6: no
 
    # You want to leave this to no unless you have *native* IPv6. With 6to4 and
    # Terredo tunnels your web browser should favor IPv4 for the same reasons
    prefer-ip6: no
 
    # Use this only when you downloaded the list of primary root servers!
    # If you use the default dns-root-data package, unbound will find it automatically
    #root-hints: "/var/lib/unbound/root.hints"
 
    # Trust glue only if it is within the server's authority
    harden-glue: yes
 
    # Require DNSSEC data for trust-anchored zones, if such data is absent, the zone becomes BOGUS
    harden-dnssec-stripped: yes
 
    # Don't use Capitalization randomization as it known to cause DNSSEC issues sometimes
    # see https://discourse.pi-hole.net/t/unbound-stubby-or-dnscrypt-proxy/9378 for further details
    use-caps-for-id: no
 
    # Reduce EDNS reassembly buffer size.
    # Suggested by the unbound man page to reduce fragmentation reassembly problems
    edns-buffer-size: 1472
 
    # Perform prefetching of close to expired message cache entries
    # This only applies to domains that have been frequently queried
    prefetch: yes
 
    # One thread should be sufficient, can be increased on beefy machines. In reality for most users running on small networks or on a single machine, it should be unnecessary to seek performance enhancement by increasing num-threads above 1.
    num-threads: 1
 
    # Ensure kernel buffer is large enough to not lose messages in traffic spikes
    so-rcvbuf: 1m
 
    # Ensure privacy of local IP ranges
    private-address: 192.168.0.0/16
    private-address: 169.254.0.0/16
    private-address: 172.16.0.0/12
    private-address: 10.0.0.0/8
    private-address: fd00::/8
    private-address: fe80::/10

 systemctl enable unbound

Now just enter 127.0.0.1#5335 in Settings>DNS (upstream DNS) Custom 1, unchecking any upstream DNS previously setup.

 pihole -a -p

vi /etc/systemd/network/20-wired.network

[Match]
Name=eth0
 
[Network]
Address=192.168.1.10/24
Gateway=192.168.1.1
DNS=192.168.1.10

Put “SSH” file in root/boot folder so SSH is available

sudo apt update && apt dist-upgrade -y
sudo raspi-config # change/set timezone&locales
exit #reconnect
sudo apt install -y htop
sudo curl -sSL https://install.pi-hole.net | bash
pihole -a -p MyP4sw0rdIsFabul0us
rm ~/.bash_history
sudo apt install -y unbound

→ https://docs.pi-hole.net/guides/dns/unbound/

 sudo mv /etc/unbound/unbound.conf /etc/unbound/unbound.conf.org
sudo vi /etc/unbound/unbound.conf

In /etc/unbound/unbound.conf

server:
    # If no logfile is specified, syslog is used
    # logfile: "/var/log/unbound/unbound.log"
    verbosity: 0
 
    interface: 127.0.0.1
    port: 5335
    do-ip4: yes
    do-udp: yes
    do-tcp: yes
 
    # May be set to yes if you have IPv6 connectivity
    do-ip6: no
 
    # You want to leave this to no unless you have *native* IPv6. With 6to4 and
    # Terredo tunnels your web browser should favor IPv4 for the same reasons
    prefer-ip6: no
 
    # Use this only when you downloaded the list of primary root servers!
    # If you use the default dns-root-data package, unbound will find it automatically
    #root-hints: "/var/lib/unbound/root.hints"
 
    # Trust glue only if it is within the server's authority
    harden-glue: yes
 
    # Require DNSSEC data for trust-anchored zones, if such data is absent, the zone becomes BOGUS
    harden-dnssec-stripped: yes
 
    # Don't use Capitalization randomization as it known to cause DNSSEC issues sometimes
    # see https://discourse.pi-hole.net/t/unbound-stubby-or-dnscrypt-proxy/9378 for further details
    use-caps-for-id: no
 
    # Reduce EDNS reassembly buffer size.
    # Suggested by the unbound man page to reduce fragmentation reassembly problems
    edns-buffer-size: 1472
 
    # Perform prefetching of close to expired message cache entries
    # This only applies to domains that have been frequently queried
    prefetch: yes
 
    # One thread should be sufficient, can be increased on beefy machines. In reality for most users running on small networks or on a single machine, it should be unnecessary to seek performance enhancement by increasing num-threads above 1.
    num-threads: 1
 
    # Ensure kernel buffer is large enough to not lose messages in traffic spikes
    so-rcvbuf: 1m
 
    # Ensure privacy of local IP ranges
    private-address: 192.168.0.0/16
    private-address: 169.254.0.0/16
    private-address: 172.16.0.0/12
    private-address: 10.0.0.0/8
    private-address: fd00::/8
    private-address: fe80::/10

sudo systemctl enable --now unbound

Now just enter 127.0.0.1#5335 in Settings>DNS (upstream DNS) Custom 1, unchecking any upstream DNS previously setup.

pihole -v
pihole -up

• https://www.youtube.com/watch?v=FnFtWsZ8IP0
• https://docs.rackspace.com/support/how-to/create-a-linux-swap-file/
• https://docs.pi-hole.net/guides/dns/unbound/
• https://wiki.archlinux.org/title/Pi-hole
• https://pi-hole.net/
• https://peppe8o.com/install-pi-hole-in-your-raspberry-pi-with-raspberry-pi-os-lite/