Run a bridge node

Overview

This guide demonstrates how to run the bridge node on the Ronin mainnet using Docker.

To be eligible for running the bridge node, you need to go through a governance process that requires approval of at least 70% of the current bridge operators. Only the bridge operators selected by Sky Mavis and community can run bridge nodes.

Prerequisites

Docker

Install Docker Engine and the Docker Compose plugin:

RPC endpoints

Have two RPC endpoints ready:

Ronin RPC endpoint for listening and sending events on the mainnet: https://api.roninchain.com/rpc.
Ethereum RPC endpoint for listening and sending events on the Ethereum chain, such as Alchemy or Infura.

Private key

Generate a private key for operating the bridge node. For instructions, see Generate keys.

Steps

Set up a directory for the bridge and two nested directories for its data and the Docker configuration:
```
mkdir -p ~/ronin-bridge/{data,docker}
cd ~/ronin-bridge/docker/
```

In the docker directory, create a docker-compose.yml file with the following configuration:

version: "3.1"
services:
  db:
    image: postgres:14.3
    restart: always
    command: postgres -c 'max_connections=1000'
    hostname: db
    container_name: db
    ports:
      - 127.0.0.1:5432:5432
    environment:
      POSTGRES_PASSWORD: ${DB_PASSWORD}
    volumes:
      - ~/ronin-bridge/data:/var/lib/postgresql/data
  bridge:
    image: ${BRIDGE_IMAGE}
    restart: always
    container_name: bridge
    environment:
      - LISTENERS__RONIN__RPCURL=${LISTENERS__RONIN__RPCURL}
      - LISTENERS__RONIN__SECRET__BRIDGEOPERATOR__PLAINPRIVATEKEY=${LISTENERS__RONIN__SECRET__BRIDGEOPERATOR__PLAINPRIVATEKEY}
      - LISTENERS__ETHEREUM__RPCURL=${LISTENERS__ETHEREUM__RPCURL}
      - DATABASE__HOST=db
      - DATABASE__DBNAME=${DATABASE__DBNAME}
      - DATABASE__PORT=5432
      - DATABASE__USER=${DATABASE__USER}
      - DATABASE__PASSWORD=${DATABASE__PASSWORD}
      - VERBOSITY=${VERBOSITY}
      - CONFIG_PATH=${CONFIG_PATH}
      - LISTENERS__RONIN__TASKINTERVAL=${LISTENERS__RONIN__TASKINTERVAL}
      - LISTENERS__RONIN__TRANSACTIONCHECKPERIOD=${LISTENERS__RONIN__TRANSACTIONCHECKPERIOD}
      - LISTENERS__RONIN__MAXPROCESSINGTASKS=${LISTENERS__RONIN__MAXPROCESSINGTASKS}
      - LISTENERS__ETHEREUM__GETLOGSBATCHSIZE=${LISTENERS__ETHEREUM__GETLOGSBATCHSIZE}
      - LISTENERS__RONIN__STATS__NODE=${LISTENERS__RONIN__STATS__NODE}
      - LISTENERS__RONIN__STATS__HOST=${LISTENERS__RONIN__STATS__HOST}
      - LISTENERS__RONIN__STATS__SECRET=${LISTENERS__RONIN__STATS__SECRET}
    depends_on:
      - db

This compose file defines two services:

bridge that pulls a bridge image.
db that builds a Postgres database for the bridge.

In the docker directory, create an .env file and add the following content, replacing the <...> placeholder values with your information:

# Your Ethereum RPC endpoint
LISTENERS__ETHEREUM__RPCURL=<ETHEREUM_RPC_ENDPOINT>

# The latest version of the bridge's image as listed in https://docs.roninchain.com/bridge-operators/setup/upgrade-bridge
BRIDGE_IMAGE=<BRIDGE_IMAGE>

# Your bridge operator private key without the 0x prefix
LISTENERS__RONIN__SECRET__BRIDGEOPERATOR__PLAINPRIVATEKEY=<BRIDGE_OPERATOR_PRIVATE_KEY>

DATABASE__DBNAME=bridge
DATABASE__USER=postgres

# The Postgres database password
DATABASE__PASSWORD=<DATABASE_PASSWORD>

CONFIG_PATH=config.mainnet.json
VERBOSITY=3

# Ronin RPC endpoint
LISTENERS__RONIN__RPCURL=<RONIN_RPC_ENDPOINT>

LISTENERS__RONIN__TASKINTERVAL=3s
LISTENERS__RONIN__TRANSACTIONCHECKPERIOD=50s
LISTENERS__RONIN__MAXPROCESSINGTASKS=200
LISTENERS__ETHEREUM__GETLOGSBATCHSIZE=100

# The name of your node that you want displayed on https://ronin-stats.roninchain.com/
LISTENERS__RONIN__STATS__NODE=<NODE_NAME>

LISTENERS__RONIN__STATS__HOST=wss://ronin-stats-ws.roninchain.com/bridge
LISTENERS__RONIN__STATS__SECRET=WSyDMrhRBe111

Start the bridge node:
```
cd ~/ronin-bridge && docker-compose up -d
```
This command pulls the bridge image and a Postgres database, and starts the services you defined.
After a few minutes, check the status of your node on the Ronin Analytics page. If it's green, the node is connected and up to date with the network.

Review the log for the bridge.

docker logs node -f --tail 100
docker logs bridge -f --tail 100

Verify the bridge is working

Whenever you wish to verify that your node is working, run the following command:

docker-compose logs bridge | head -n 20

Make sure that the "Operator account" address in the response matches your registered bridge operator address.

Here's an example:

bridge     | INFO [03-22|07:59:10.368] [RoninListener] Operator account         address=0x2e82D2b56f858f79DeeF11B160bFC4631873da2B

Overview​

Prerequisites​

Docker​

RPC endpoints​

Private key​

Steps​

Verify the bridge is working​