Setup OP Geth Node

Steps to start Postgres, Light Client, Geth, Rhea, Hercules, and optional Nginx via Docker.

This OP Geth node serves as a non-voting RPC node that enables executing Eth L2 transactions.

• Setting up an OP Geth Node needs OP Geth, Rhea, Hercules, Light Client (AKA Proxy), and Postgres.

• OP Geth has been modified to calculate gas based on the required Solana compute. It retrieves the required gas value by querying Light Client.

• Rhea picks up L2 transactions from OP Geth mempool, composes them into Solana transactions, and submits them to Solana for sequencing.

• Solana's consensus voting nodes execute and vote on the ordering of these transactions. Hercules reads state from Solana nodes and confirms L2 transactions and ordering on OP Geth.

Machine specs

We recommend using an Ubuntu machine with:

Minimum

4 cores, 8GB RAM, 1TB storage, 8MBit/sec network bandwidth

E.g. AWS c5a.2xlarge, Ubuntu, x86_64, EBS 1 TB GP3

Recommended

8 cores, 16GB RAM, 16 cores, 1 TB SSD, 25 MBit/sec network bandwidth

E.g. AWS c5a.4xlarge, Ubuntu, x86_64, EBS 1 TB GP3

Run Docker containers sequentially in the order below

1

Postgres

docker-compose up -d postgres_rome
docker logs postgres_rome -f

Wait for the logs print out "database system is ready to accept connections".

2

Apply Migrations

docker-compose up apply_migrations

3

Light Client

Light Client provides an Ethereum interface to access Solana state.

This includes providing gas estimates to Geth.

docker-compose up -d proxy
docker logs proxy -f

Wait for the logs print out "Starting the RPC server at 0.0.0.0:9090".

4

Geth

Geth is the rollup client that accepts and executes Eth L2 transactions, and provides transaction results to the user. It is a non-voting RPC node.

docker-compose up -d geth
docker logs geth -f

Wait for the logs print out "HTTP server started".

5

Rhea

Rhea takes rollup transactions from Geth, packages them as Rome Solana transactions, and submits them to Solana for sequencing.

docker-compose up -d rhea
docker logs rhea -f

Wait for the logs to print out "Polling: http://geth:8545".

6

Hercules

docker-compose up -d hercules
docker logs hercules -f

Wait for the logs to print out "SolanaBlockLoader is in sync with Solana validator".

7

Nginx

If you are setting up your L2 on a remote machine, then run the nginx container.

Modify romenginx volumes in rome-setup/docker/docker-compose.yml to use the location of your SSL cert & private key (replace caesar.devnet.romeprotocol.xyz with your domain below):

volumes:
  - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
  - /etc/letsencrypt/live/caesar.devnet.romeprotocol.xyz/fullchain.pem:/etc/nginx/ssl/selfsigned.crt:ro
  - /etc/letsencrypt/live/caesar.devnet.romeprotocol.xyz/privkey.pem:/etc/nginx/ssl/selfsigned.key:ro

docker-compose up -d romenginx
docker logs romenginx -f

Wait for the logs to print out "Configuration complete; ready for start up".

Restart services if needed

docker stop romenginx && docker rm romenginx
docker stop hercules && docker rm hercules
docker stop rhea && docker rm rhea
docker stop geth && docker rm geth
docker stop proxy && docker rm proxy
docker stop postgres_rome && docker rm postgres_rome

docker-compose up -d postgres_rome
docker-compose up -d proxy
docker-compose up -d geth
docker-compose up -d rhea
docker-compose up -d hercules
docker-compose up -d romenginx

Docker container overview

The docker containers started above are listed below:

Docker Container	Purpose
proxy	Light Client App
geth	OP Geth App
rhea	Rhea App
hercules	Hercules App
postgres	Postgres database
apply_migrations	Postgres migrations
romenginx	Nginx Proxy