💻Baremetal

Authors: [man4ela | catapulta.eth]

System Requirements

CPU	OS	RAM	DISK
8+ cores CPU	Debian 12/Ubuntu 22.04	=> 16 GB RAM	=6TB+ (SSD or NVMe)

The Arbitrum Sepolia archive node has a size of 5.2TB on November 18th, 2024

Before you start, make sure that you have your own synced Ethereum Sepolia RPC URL (e.g. Erigon) and Consensus Layer Beacon endpoint (e.g. Lighthouse) ready.

Pre-Requisites

sudo apt update -y && sudo apt upgrade -y && sudo apt autoremove -y

sudo apt install -y git make wget aria2 gcc pkg-config libusb-1.0-0-dev libudev-dev jq gcc g++ curl libssl-dev screen apache2-utils build-essential pkg-config

Install Docker

# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

# Add the repository to Apt sources:
echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

sudo apt-get update

# Install Docker Packages
 sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
 
 # Verify Docker Installation is Successful
sudo docker run hello-world

Setting up Firewall

Set explicit default UFW rules

sudo ufw default deny incoming
sudo ufw default allow outgoing

Allow SSH

sudo ufw allow 22/tcp

Allow remote RPC connections with Mode Node

sudo ufw allow from ${REMOTE.HOST.IP} to any port 9545

Not advised to allow all or unknown IP address to RPC port

Enable Firewall

sudo ufw enable

To check the status of UFW and see the current rules

sudo ufw status verbose

Install dependencies

Required Software Dependencies

Dependency	Version	Version Check Command
go	^1.21	go version
node	^20	node --version
pnpm	^8	pnpm --version
foundry	^0.2.0	forge --version
make	^4	make --version
yarn	1.22.21	yarn --version
nvm	0.39.3	nvm --verison

Install GO

sudo wget https://go.dev/dl/go1.21.6.linux-amd64.tar.gz && sudo rm -rf /usr/local/go && sudo tar -C /usr/local -xzf go1.21.6.linux-amd64.tar.gz && rm go1.21.6.linux-amd64.tar.gz

echo 'export PATH=$PATH:/usr/local/go/bin:/root/.local/bin' >> /root/.bashrc

source /root/.bashrc

Install nvm

wget -qO- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.3/install.sh | bash

Download foundry

curl -L https://foundry.paradigm.xyz | bash

Install foundry

source /root/.bashrc

foundryup

Install node and yarn

nvm install 18.12.0 && npm install --global yarn && nvm use 18.12.0 && npm -g install pnpm

source /root/.bashrc

Check if go and all dependancies are installed

go version
nvm -v
npm -v
yarn -v
pnpm -v

Build the Nitro Node

git clone --branch v3.2.1 https://github.com/OffchainLabs/nitro.git

cd nitro

git submodule update --init --recursive --force

docker build . --tag nitro-node

To upgrade nitro check for latest version at https://github.com/OffchainLabs/nitro/releases:

#Copy Nitro binary from docker to /root/nitro/build/bin

docker pull offchainlabs/nitro-node:v3.2.1-d81324d

docker run -d --name nitro offchainlabs/nitro-node:v3.2.1-d81324d

docker cp nitro:/usr/local/bin/nitro /root/nitro/build/bin/

Create Data directory and download latest snapshot

cd

screen -S snapshot #start a screen session named snapshot to download a db archive for nitro:

mkdir snapshot && cd snapshot

#check for actual snapshot here 
https://snapshot-explorer.arbitrum.io/

#Download snapshot parts
aria2c -Z -x 16 "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part0" "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part1" "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part2" "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part3" "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part4" "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part5" "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part6" "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part7" "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part8" "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part9" "https://snapshot.arbitrum.io/sepolia-rollup/2024-11-03-4398c4dd/archive.tar.part10"

#To quit a session window during download progress use ctrl A+D and screen -r snapshot to attach again

#extract downloaded archive parts
cat archive.tar.part0 archive.tar.part1 archive.tar.part2 archive.tar.part3 archive.tar.part4 archive.tar.part5 archive.tar.part6 archive.tar.part7 archive.tar.part8 archive.tar.part9 archive.tar.part10 | tar -xvf -

mkdir -p /root/.local/share/nitro/datadir/nitro/nitro

#move contents into data directory:

mv arbitrumdata l2chaindata keystore nodes LOCK /root/.local/share/nitro/datadir/nitro/nitro

Create Systemd service for Nitro

sudo nano /etc/systemd/system/nitro-sepolia.service

Paste the configs and save by entering ctrl+X and Y+ENTER:

[Unit]
Description=Arbitrum Sepolia Nitro Service
After=network.target
StartLimitIntervalSec=60
StartLimitBurst=3

[Service]
Type=simple
Restart=on-failure
RestartSec=5
TimeoutSec=900
User=root
Nice=0
LimitNOFILE=200000
WorkingDirectory=/root/nitro
ExecStart=/root/nitro/build/bin/nitro \
        --execution.caching.archive \
        --persistent.chain=/root/.local/share/nitro/datadir/nitro \
        --persistent.global-config=/root/.local/share/nitro/datadir \
        --parent-chain.connection.url={ETH SEPOLIA URL} \
        --chain.id=421614 \
        --http.api=net,web3,eth,debug \
        --http.corsdomain=* \
        --http.addr=0.0.0.0 \
        --http.port=9545 \
        --execution.rpc.gas-cap=0 \
        --http.vhosts=* \
        --log-level=3 \
        --parent-chain.blob-client.beacon-url={ETH SEPOLIA CL URL} \
        --validation.wasm.allowed-wasm-module-roots \
        --ws.addr=0.0.0.0 \
        --ws.port=9658 \
        --ws.api=net,web3,eth,debug \
        --ws.origins=*
KillSignal=SIGINT

[Install]
WantedBy=multi-user.target

Replace {ETH SEPOLIA URL} and {ETH SEPOLIA CL URL} with your synced Ethereum Sepolia and Ethereum Sepolia Consensus Layer endpoints

Launch Nitro

sudo systemctl daemon-reload #refresh systemd configuration when changes made

sudo systemctl enable nitro-sepolia #enable nitro-sepolia.service at system startup

sudo systemctl start nitro-sepolia #start nitro-sepolia.service

sudo systemctl stop nitro-sepolia #stop nitro-sepolia.service

sudo nano /etc/systemd/system/nitro-sepolia.service #make changes in nitro-sepolia.service file

Monitor the logs for errors

journalctl -u nitro-sepolia.service -f -n 100 #follow logs of nitro-sepolia.service

Run curl command in the terminal to check the status of your node

curl -H "Content-type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}' http://localhost:9545

Expected output during synchronization:

{"jsonrpc":"2.0","id":1,"result":{"batchProcessed":346862,"batchSeen":346862,"blockNum":98302890,"consensusSyncTarget":98303169,"feedPendingMessageCount":0,"messageOfLastBlock":98302890,"messageOfProcessedBatch":98302538,"msgCount":98303174,"syncTargetMsgCount":98303169}}

When it returns false then your node is fully synchronized with the network

References

Releases · OffchainLabs/nitroGitHub

Build Nitro Locallyarbitrum