Light Node

Setting up a light node

Official documentation

Hardware Requirement

• Memory: 500 MB

• CPU: Single core

• Disk: 20 GB SSD

Server preparation

sudo apt update && sudo apt upgrade -y
sudo apt install curl git wget htop tmux build-essential jq make gcc tar clang pkg-config libssl-dev ncdu -y

---

GO 1.23.1

ver="1.23.1"
wget "https://golang.org/dl/go$ver.linux-amd64.tar.gz"
sudo rm -rf /usr/local/go
sudo tar -C /usr/local -xzf "go$ver.linux-amd64.tar.gz"
rm "go$ver.linux-amd64.tar.gz"
echo "export PATH=$PATH:/usr/local/go/bin:$HOME/go/bin" >> $HOME/.bash_profile
source $HOME/.bash_profile
go version

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Install Celestia-node

cd $HOME
rm -rf celestia-node
git clone https://github.com/celestiaorg/celestia-node.git
cd celestia-node/
git checkout tags/v0.30.2 
make build 
sudo make install 
make cel-key

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Config and init app

celestia light init

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Create wallet

KEY_NAME="my_celes_key"
cd ~/celestia-node
./cel-key add $KEY_NAME --keyring-backend test --node.type light

(Optional) Restore an existing cel_key

KEY_NAME="my_celes_key"
cd ~/celestia-node
./cel-key add $KEY_NAME --keyring-backend test --node.type light

You can find the address by running the following command in the celestia-node directory

cd $HOME/celestia-node
./cel-key list --node.type light --keyring-backend test

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Add Consensus node RPC and gRPC ports

CORE_IP="<PUT_CONSENSUS_NODE_IP>"
CORE_RPC_PORT="<PUT_CONSENSUS_NODE_RPC_PORT>"
CORE_GRPC_PORT="<PUT_CONSENSUS_NODE_GRPC_PORT>"
KEY_NAME="my_celes_key"

---

Create Service file

sudo tee /etc/systemd/system/celestia-light.service > /dev/null <<EOF
[Unit]
Description=celestia light
After=network-online.target

[Service]
User=$USER
ExecStart=$(which celestia) light start \
--core.ip $CORE_IP \
--core.rpc.port $CORE_RPC_PORT \
--core.grpc.port $CORE_GRPC_PORT \
--keyring.accname $KEY_NAME \
--metrics.tls=true \
--metrics --metrics.endpoint otel.celestia.observer
Restart=on-failure
RestartSec=3
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target
EOF

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Enable and start service

sudo systemctl daemon-reload
sudo systemctl enable celestia-light
sudo systemctl restart celestia-light && sudo journalctl -u celestia-light -fo cat

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Get your node information

NOTE: You can only generate an auth token after initializing and starting your celestia-node.

NODE_TYPE=light
AUTH_TOKEN=$(celestia $NODE_TYPE auth admin)

Then you can get the peerId of your node with the following curl command

curl -X POST \
     -H "Authorization: Bearer $AUTH_TOKEN" \
     -H 'Content-Type: application/json' \
     -d '{"jsonrpc":"2.0","id":0,"method":"p2p.Info","params":[]}' \
     http://localhost:26658