Introduction

What is a Fuel Node? A Fuel node on the blockchain, or “client”, is software that downloads and maintains a copy of the blockchain. It verifies the authenticity of each block and transaction, ensuring that its copy is always up-to-date and synchronized with the network.

Consensus Mechanism The Fuel Network uses Proof of Authority (PoA) in its beta testnets.

• Validators: Selected entities responsible for creating blocks and validating transactions based on their reputation.

• Advantages of PoA: Fast transaction times and energy efficiency.

Node Installation

Preparing the Environment

Upgrade Packages

sudo apt-get update && sudo apt-get upgrade -y

Install wget and curl

sudo apt install wget curl

Install rustup

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs/ | sh

Installing Fuel Toolchain

Install Fuel Toolchain

curl https://install.fuel.network | sh

Update Environment

source /home/(user)/.bashrc

Check Fuel Version

fuelup --version

Verify Installation

Ensure you have the latest toolchain:

fuelup show

Obtaining a Sepolia API Key (Ethereum Testnet)

Register on Alchemy

Get your personalized Sepolia ETH RPC API keys:

Test the API

Send the first request to test the API:

curl https://eth-mainnet.g.alchemy.com/v2/AvlIDj-8eJlcz2NfOK1iMbR5iK1MnAtO \
-X POST -H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"alchemy_getAssetTransfers","params":[{"fromBlock":"0x0","category":["external","erc20","erc721"],"fromAddress":"0x646d3C0367f91c6sCcf7532A91Ef425BEcdfB34E"}],"id":0}'

Generating a New P2P Key

Run Keygen

fuel-core-keygen new --key-type peering

Chain Configuration

Create Configuration Folder

git clone https://github.com/FuelLabs/chain-configuration chain-configuration
mkdir .fuel-sepolia-testnet 
cp -r chain-configuration/ignition/* ~/.fuel-sepolia-testnet/

Node Initialization and Start

Start the Node

fuel-core run \
--service-name=<your_node>-sepolia-testnet-node \
--keypair <P2P key> \
--relayer https://eth-sepolia.g.alchemy.com/v2/<ETH RPC API> \
--ip=0.0.0.0 --port=4000 --peering-port=30333 \
--db-path ~/.fuel-sepolia-testnet \
--snapshot ~/.fuel-sepolia-testnet \
--utxo-validation --poa-instant false --enable-p2p \
--reserved-nodes /dns4/p2p-testnet.fuel.network/tcp/30333/p2p/16Uiu2HAmDxoChB7AheKNvCVpD4PHJwuDGn8rifMBEHmEynGHvHrf \
--sync-header-batch-size 100 \
--enable-relayer \
--relayer-v2-listening-contracts=0x01855B78C1f8868DE70e84507ec735983bf262dA \
--relayer-da-deploy-height=5827607 \
--relayer-log-page-size=500 \
--sync-block-stream-buffer-size 30

Creating a Service with SystemD

SystemD facilitates automatic and reliable management of the Fuel node, improving operational stability and efficiency.

Automation and Supervision

Create the Service

sudo tee /etc/systemd/system/fueld.service > /dev/null << EOF
[Unit]
Description=Fuel Node Beta-5
After=network.target

[Service]
User=$USER
Type=simple
ExecStart=$(which fuel-core run) \
--service-name stonekeyboard-sepolia-testnet \
--keypair <P2P key> \
--relayer https://eth-sepolia.g.alchemy.com/v2/<ETH RPC API> \
--ip=0.0.0.0 --port=5000 --peering-port=40444 \
--db-path $HOME/.fuel-sepolia-testnet \
--snapshot $HOME/.fuel-sepolia-testnet \
--utxo-validation --poa-instant false --enable-p2p \
--reserved-nodes /dns4/p2p-testnet.fuel.network/tcp/30333/p2p/16Uiu2HAmDxoChB7AheKNvCVpD4PHJwuDGn8rifMBEHmEynGHvHrf \
--sync-header-batch-size 100 \
--enable-relayer \
--relayer-v2-listening-contracts=0x01855B78C1f8868DE70e84507ec735983bf262dA \
--relayer-da-deploy-height=5827607 \
--relayer-log-page-size=500 \
--sync-block-stream-buffer-size 30

Restart=on-failure
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target 
EOF

Reload and Start the Service

sudo systemctl daemon-reload
sudo systemctl enable fueld
sudo systemctl start fueld
sudo systemctl status fueld.service

View Logs

sudo journalctl -u fueld -f -o cat

Connect Your Node to the Fuel Wallet

Log in to your Fuel wallet account and click on the top part where it indicates the network, then click on "+Add new network" and type in the address of your node:

http://ip_node:4000/v1/graphql

Click on "+Add" to complete the setup.