Setting Up a Celestia Light Node on Mocha Testnet

Architecture & Protocol Overview

Execution topology, consensus mechanics, and operational assumptions.

Celestia light nodes ensure data availability by conducting Data Availability Sampling over the libp2p network without storing the entire chain state. ### Why Run a Light Node? - Verify block data availability directly from your terminal. - Support network decentralization with under 2GB RAM. - No validator stake or high-bandwidth requirement needed.

Tags:#Celestia#Modular#Light Node#DAS#Beginner

Pre-Flight System Check (Ubuntu 22.04 / 24.04 LTS)

PRE-FLIGHT

Run this single diagnostics command on your host before beginning the installation to ensure you have sufficient compute, disk headroom, and proper privileges:

preflight-check.sh

lscpu | grep "Model name\|CPU(s):"
free -h
df -h /
uname -a

Step-by-Step Runbook Execution(3 Verified Modules)

Click checkmark to save progress

Step 1 of 3

Install Celestia Node Binary

Download the prebuilt celestia node binary from the official Celestia GitHub release.

bash ~ root@validator

cd $HOME
wget https://github.com/celestiaorg/celestia-node/releases/download/v0.18.2/celestia-node_Linux_x86_64.tar.gz
tar -xvf celestia-node_Linux_x86_64.tar.gz
sudo mv celestia /usr/local/bin/

Expected Stdout / Terminal VerificationSTDOUT STREAM

celestia

How to Verify Step Success:Execute 'celestia version' to confirm version 0.18.2 or later is installed.

Step 2 of 3

Initialize the Light Node Store

Initialize the light node configuration directory for the Mocha testnet network.

bash ~ root@validator

celestia light init --p2p.network mocha

Expected Stdout / Terminal VerificationSTDOUT STREAM

Node store initialized at ~/.celestia-light-mocha-4

How to Verify Step Success:Check directory contents with 'ls -la ~/.celestia-light-mocha-4'.

Step 3 of 3

Start Light Node and Sample Blocks

Start the light node service and connect to trusted core gRPC endpoints.

bash ~ root@validator

celestia light start --core.ip rpc-mocha.celestia.net --p2p.network mocha

Expected Stdout / Terminal VerificationSTDOUT STREAM

INFO header/sync: sync complete to head block

How to Verify Step Success:Observe the log messages showing sampled headers and sampling success rates.

Network Port Matrix & UFW Firewall Hardening

Configure your server firewall so that P2P gossip ports are accessible to network peers while internal RPC and Engine APIs remain strictly protected from public port scanners.

Port / Protocol	Interface	Access Level	UFW Command
22 / TCP	SSH Management	Restricted / VPN	sudo ufw allow 22/tcp
P2P Peer Ports	Gossip & Block Sampling	Public (0.0.0.0/0)	sudo ufw allow 26656/tcp
RPC / REST / API	Node Query & Transactions	Localhost Only (127.0.0.1)	(Do not open publicly)