> For the complete documentation index, see [llms.txt](https://opendex.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://opendex.network/develop/docs/liquidity-providers/pro-hardware.md). # Pro Hardware Guide This guide is written for professional liquidity providers to turn a powerful Mini PC into an always-on OpenDEX node. ![](/files/-MT_sqiJs_8xySAarC-M) Two options are available: 1. **Light setup** using [Neutrino](https://github.com/lightninglabs/neutrino) and a random open eth provider or optionally [Infura](https://infura.io/). This keeps the setup light-weight & cheap, but creates a certain dependency on other people's full nodes. 2. **Full setup** using [bitcoind](https://github.com/bitcoin/bitcoin/), [litecoind](https://github.com/litecoin-project/litecoin) and [geth](https://github.com/ethereum/go-ethereum). Requires more resources and an SSD, but keeps the setup trustless. ## Light Reference Shopping List (Europe): \~180 € * [GIGABYTE GB-BLCE-4105 BRIX](https://www.computeruniverse.net/en/gigabyte-gb-blce-4105-brix): 138 € * [4 GB RAM](https://www.computeruniverse.net/en/crucial-4gb-ddr4-so-dimm-ct4g4sfs824a-2400mhz-ram): 15 € * [120GB M.2 SSD](https://www.computeruniverse.net/en/wd-green-ssd-m2-2280-120gb): 20 € * [USB stick for backups](https://www.amazon.es/dp/B00TPG6P22/): 3,99 € * Any >1GB USB stick will do. * A NAS/Samba share works too. ## Full Reference Shopping List (Europe): \~465 € * [GIGABYTE GB-BLCE-4105 BRIX](https://www.computeruniverse.net/en/gigabyte-gb-blce-4105-brix): 138 € * Alternative: [ODROID H2+](https://www.hardkernel.com/shop/odroid-h2plus/) - same platform, features NVME, needs separate case, power supply and wifi dongle, out of stock at times * [32 GB RAM](https://www.computeruniverse.net/en/kingston-hyperx-impact-32gb-ddr4-so-dimm-ram-2): 127 € * Alternative: [List of compatible RAM](https://wiki.odroid.com/odroid-h2/hardware/ram) * [2TB SSD](https://www.computeruniverse.net/en/sandisk-ssd-plus-25-2tb): 193 € * Alternative: [1 TB M.2 SSD NVME](https://www.computeruniverse.net/en/gigabyte-ssd-nvme-m2-2280-1tb) - for Odroid H2+ * Alternative: [240GB M.2 SSD](https://www.computeruniverse.net/en/wd-green-ssd-m2-2280-240gb) + [2TB HDD](https://www.computeruniverse.net/en/seagate-firecuda-compute-st2000lx001-sshd-2tb) * [USB stick for backups](https://www.amazon.es/dp/B00TPG6P22/): 3,99 € * Any >1GB USB stick will do. * A NAS/Samba share works too. ## Setup 1. [Download Ubuntu Server 20.04 LTS](https://ubuntu.com/download/server) onto your computer. Any other linux distribution supporting docker is also fine. This guide was written using `Ubuntu Server 20.04`. 2. Insert a USB Stick into your computer and [create the a bootable USB Stick](https://ubuntu.com/tutorials/tutorial-create-a-usb-stick-on-ubuntu) with the ubuntu image you just downloaded. 3. Open your Mini PC, plug in RAM & drives, close it, connect it to your router via ethernet cable and to a power supply. Connect a screen via HDMI, a USB keyboard, the created bootable USB Stick, fire the Mini PC up and follow the the inital setup instructions. 4. Update ubuntu via `sudo apt update && sudo apt upgrade` 5. If you are using Ubuntu 20.04, install docker & docker-compose by running `sudo apt install docker.io`. Otherwise if you are using any version besides Ubuntu 20.04, follow the [official instructions](https://docs.docker.com/install/linux/docker-ce/ubuntu/) to install docker. 6. Add new user `opendex`: ```bash ubuntu@ubuntu:~$ sudo adduser opendex Adding user `opendex' ... Adding new group `opendex' (1001) ... Adding new user `opendex' (1001) with group `opendex' ... Creating home directory `/home/opendex' ... Copying files from `/etc/skel' ... New password: Retype new password: passwd: password updated successfully Changing the user information for opendexd Enter the new value, or press ENTER for the default Full Name []: Room Number []: Work Phone []: Home Phone []: Other []: Is the information correct? [Y/n] ubuntu@ubuntu:~$ Y ``` 7. Add the `opendex` user to the sudo group (advanced users can skip this and use another user to run sudo commands), the docker group and test if docker is working: ```bash ubuntu@ubuntu:~$ sudo usermod -aG sudo opendex ubuntu@ubuntu:~$ sudo usermod -aG docker opendex # switch to user opendex ubuntu@ubuntu:~$ sudo su - opendex opendex@ubuntu:~$ docker run hello-world Hello from Docker! This message shows that your installation appears to be working correctly. ``` 8. Looking good! Optionally, add an alias to enter your opendexd environment by simply typing "opendex": ```bash opendex@ubuntu:~$ sudo nano ~/.bash_aliases # add the line alias opendex='bash ~/opendex.sh' # CTRL+S, CTRL+X. Then run opendex@ubuntu:~$ source ~/.bashrc ``` 9. Connect the USB stick to your machine and set it up. It is very important to do this for a mainnet setup (given you do not want to lose money)! ```bash # check the USB stick's path with opendex@ubuntu:~$ ls -la /dev/ | grep sd crw------- 1 root root 2, 61 Dec 3 16:27 ptysd brw-rw---- 1 root disk 8, 0 Dec 3 16:27 sda brw-rw---- 1 root disk 8, 1 Dec 3 16:27 sda1 #this is your USB Stick crw------- 1 root root 3, 61 Dec 3 16:27 ttysd # set it to automount via fstab opendex@ubuntu:~$ sudo nano /etc/fstab # add the line /dev/sda1 /media/USB ext4 defaults 0 2 # CTRL+S, CTRL+X. Then mount it opendex@ubuntu:~$ sudo mkdir /media/USB opendex@ubuntu:~$ sudo mount -a # check if mounting worked opendex@ubuntu:~$ df -h # make sure opendexd can use it opendex@ubuntu:~$ sudo chown opendex:opendex /media/USB ``` **DONE!** Continue [here](/develop/docs/liquidity-providers.md#the-setup).