luxd

Node implementation for the Lux network - a blockchains platform with high throughput, and blazing fast transactions.

Installation

Lux is an incredibly lightweight protocol, so the minimum computer requirements are quite modest. Note that as network usage increases, hardware requirements may change.

The minimum recommended hardware specification for nodes connected to Mainnet is:

• CPU: Equivalent of 8 AWS vCPU
• RAM: 16 GiB
• Storage: 1 TiB
  • Nodes running for very long periods of time or nodes with custom configurations may observe higher storage requirements.
• OS: Ubuntu 22.04/24.04 or macOS >= 12
• Network: Reliable IPv4 or IPv6 network connection, with an open public port.

If you plan to build Lux Node from source, you will also need the following software:

• Go version >= 1.23.9
• gcc
• g++

Building From Source

Clone The Repository

Clone the Lux Node repository:

git clone git@github.com:luxfi/node.git
cd node

This will clone and checkout the master branch.

Building Lux Node

Build Lux Node by running the build task:

./scripts/run_task.sh build

The luxd binary is now in the build directory. To run:

./build/luxd

Binary Repository

Install Lux Node using an apt repository.

Adding the APT Repository

If you already have the APT repository added, you do not need to add it again.

To add the repository on Ubuntu, run:

sudo su -
wget -qO - https://downloads.lux.network/luxd.gpg.key | tee /etc/apt/trusted.gpg.d/luxd.asc
source /etc/os-release && echo "deb https://downloads.lux.network/apt $UBUNTU_CODENAME main" > /etc/apt/sources.list.d/lux.list
exit

Installing the Latest Version

After adding the APT repository, install node by running:

sudo apt update
sudo apt install node

Binary Install

Download the latest build for your operating system and architecture.

The Lux binary to be executed is named luxd.

Docker Install

Make sure Docker is installed on the machine - so commands like docker run etc. are available.

Building the Docker image of latest node branch can be done by running:

./scripts/run-task.sh build-image

To check the built image, run:

docker image ls

The image should be tagged as luxfi/node:xxxxxxxx, where xxxxxxxx is the shortened commit of the Lux source it was built from. To run the Lux node, run:

docker run -ti -p 9650:9650 -p 9651:9651 luxfi/node:xxxxxxxx /node/build/luxd

Running Lux

Connecting to Mainnet

To connect to the Lux Mainnet, run:

./build/luxd

You should see some pretty ASCII art and log messages.

You can use Ctrl+C to kill the node.

Connecting to Testnet

To connect to the Testnet Testnet, run:

./build/luxd --network-id=testnet

Creating a Local Testnet

The Lux CLI is the easiest way to start a local network.

lux network start
lux network status

Single-Node Development Mode

For quick local development, you can run a single-node Lux network with sybil protection disabled:

# Using the convenience script
make dev

# Or manually with all options
./build/luxd \
    --network-id=local \
    --sybil-protection-enabled=false \
    --http-host=0.0.0.0 \
    --http-port=9630 \
    --staking-port=9631 \
    --api-admin-enabled=true \
    --api-keystore-enabled=true \
    --api-metrics-enabled=true

The single-node dev mode provides:

• HTTP RPC endpoint: http://localhost:9630
• WebSocket endpoint: ws://localhost:9630/ext/bc/C/ws
• C-Chain RPC: http://localhost:9630/ext/bc/C/rpc

You can interact with the C-Chain using standard Ethereum tools:

# Example using curl
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' \
     -H "Content-Type: application/json" \
     http://localhost:9630/ext/bc/C/rpc

Note: Single-node mode with sybil protection disabled should only be used for development. Never use this configuration on public networks (Mainnet or Testnet).

A node needs to catch up to the latest network state before it can participate in consensus and serve API calls. This process (called bootstrapping) currently takes several days for a new node connected to Mainnet.

A node will not report healthy until it is done bootstrapping.

Improvements that reduce the amount of time it takes to bootstrap are under development.

The bottleneck during bootstrapping is typically database IO. Using a more powerful CPU or increasing the database IOPS on the computer running a node will decrease the amount of time bootstrapping takes.

Generating Code

Lux uses multiple tools to generate efficient and boilerplate code.

Running protobuf codegen

To regenerate the protobuf go code, run scripts/run-task.sh generate-protobuf from the root of the repo.

This should only be necessary when upgrading protobuf versions or modifying .proto definition files.

To use this script, you must have buf (v1.31.0), protoc-gen-go (v1.33.0) and protoc-gen-go-grpc (v1.3.0) installed.

To install the buf dependencies:

go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.33.0
go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.3.0

If you have not already, you may need to add $GOPATH/bin to your $PATH:

export PATH="$PATH:$(go env GOPATH)/bin"

If you extract buf to ~/software/buf/bin, the following should work:

export PATH=$PATH:~/software/buf/bin/:~/go/bin
go get google.golang.org/protobuf/cmd/protoc-gen-go
go get google.golang.org/protobuf/cmd/protoc-gen-go-grpc
scripts/run_task.sh generate-protobuf

For more information, refer to the GRPC Golang Quick Start Guide.

Running mock codegen

See the Contributing document autogenerated mocks section.

Versioning

Version Semantics

Lux Node is first and foremost a client for the Lux network. The versioning of Lux Node follows that of the Lux network.

• v0.x.x indicates a development network version.
• v1.x.x indicates a production network version.
• vx.[Upgrade].x indicates the number of network upgrades that have occurred.
• vx.x.[Patch] indicates the number of client upgrades that have occurred since the last network upgrade.

Library Compatibility Guarantees

Because luxd version denotes the network version, it is expected that interfaces exported by Lux Node may change in Patch version updates.

API Compatibility Guarantees

APIs exposed when running Lux Node will maintain backwards compatibility, unless the functionality is explicitly deprecated and announced when removed.

Supported Platforms

Lux Node can run on different platforms, with different support tiers:

• Tier 1: Fully supported by the maintainers, guaranteed to pass all tests including e2e and stress tests.
• Tier 2: Passes all unit and integration tests but not necessarily e2e tests.
• Tier 3: Builds but lightly tested (or not), considered experimental.
• Not supported: May not build and not tested, considered unsafe. To be supported in the future.

The following table lists currently supported platforms and their corresponding Lux Node support tiers:

To officially support a new platform, one must satisfy the following requirements:

Security Bugs

We and our community welcome responsible disclosures.

Please refer to our Security Policy and Security Advisories.