Set up raspberry

Setup SD

Install raspberry os - https://www.raspberrypi.com/software/

Create wpa_supplicant.conf with:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
ap_scan=1
fast_reauth=1
country=PL
network={
    ssid="WIFI Name"
    psk="WIFI password"
    id_str="0"
    priority=100
}

Create empty ssh file

Copy both files to flash

Mount HDD

#For everyone well versed in Linux and BASH, here's everything up front

#Find the drive (in our case /dev/sda1)
sudo fdisk -l
#install NTFS-3g
sudo apt-get install ntfs-3g
#Make the mount directory and manage it's owner
sudo mkdir /mnt/hdd
sudo chown pi:pi /mnt/hdd
#Mount the drive
sudo mount -t ntfs-3g -o uid-pi,gid-pi /dev/sda1 /mnt/hdd

> If it is mounted, run `sudo umount /dev/sda1`

#Now you're done but it's not permanent

#Making it permanent
#Edit file system table
sudo nano /etc/fstab

#Add this line of text after the SD card partitions
/dev/sda1	/mnt/hdd	ntfs-3g	uid=pi,gid=pi	0	0
#hit ctrl-o to save and ctrl-x to exit nano

#Now the mounting will be restored on reboot
#Reboot to test it
sudo shutdown -r now

Samba

sudo apt install samba samba-common-bin

sudo cp /etc/samba/smb.conf /etc/samba/smb.conf_backup

sudo nano /etc/samba/smb.conf

Add to the end of the file

[share]
Comment = Raspberry Pi Shared Folder
Path = /mnt/hdd
Browseable = yes
Writeable = Yes
only guest = no
create mask = 0777
directory mask = 0777
Public = yes
Guest ok = yes

sudo service smbd restart

sudo shutdown -r now

transmission

sudo apt install transmission-daemon

sudo systemctl stop transmission-daemon

sudo chown -R pi:pi /mnt/hdd/torrents/downloads
sudo chown -R pi:pi /mnt/hdd/torrents/incomplete

sudo nano /etc/transmission-daemon/settings.json

Modify in settings

"incomplete-dir": "/mnt/hdd/torrents/incomplete",
"download-dir": "/mnt/hdd/torrents/downloads",
"incomplete-dir-enabled": true,
"rpc-password": "Your_Password",
"rpc-username": "Your_Username",
"rpc-whitelist": "192.168.*.*",

sudo nano /etc/init.d/transmission-daemon

Edit file:

USER=pi

sudo nano /etc/systemd/system/multi-user.target.wants/transmission-daemon.service

Edit file:

user=pi

sudo systemctl daemon-reload
sudo chown -R pi:pi /etc/transmission-daemon
sudo mkdir -p /home/pi/.config/transmission-daemon/
sudo ln -s /etc/transmission-daemon/settings.json /home/pi/.config/transmission-daemon/
sudo chown -R pi:pi /home/pi/.config/transmission-daemon/
sudo systemctl start transmission-daemon
sudo shutdown -r now

Syncthings

sudo apt update
sudo apt full-upgrade

sudo apt install apt-transport-https

curl -s https://syncthing.net/release-key.txt | gpg --dearmor | sudo tee /usr/share/keyrings/syncthing-archive-keyring.gpg >/dev/null

echo "deb [signed-by=/usr/share/keyrings/syncthing-archive-keyring.gpg] https://apt.syncthing.net/ syncthing stable" | sudo tee /etc/apt/sources.list.d/syncthing.list

sudo apt update

sudo apt install syncthing

hostname -I

sudo mkdir /home/pi/.config/syncthing
chmod -R 777 /home/pi/.config/syncthing
syncthing

After the initial run, kill the application by pressing CTRL + C.

nano ~/.config/syncthing/config.xml
<address>127.0.0.1:8384</address>

sudo nano /lib/systemd/system/syncthing.service

[Unit]
Description=Syncthing - Open Source Continuous File Synchronization
Documentation=man:syncthing(1)
After=network.target

[Service]
User=pi
ExecStart=/usr/bin/syncthing -no-browser -no-restart -logflags=0
Restart=on-failure
RestartSec=5
SuccessExitStatus=3 4
RestartForceExitStatus=3 4

# Hardening
ProtectSystem=full
PrivateTmp=true
SystemCallArchitectures=native
MemoryDenyWriteExecute=true
NoNewPrivileges=true

[Install]
WantedBy=multi-user.target

sudo systemctl enable syncthing
sudo systemctl start syncthing
sudo systemctl status syncthing