Arbitrum

Set up your Arbitrum Mainnet & Goerli Testnet RPC node

Prerequisites

• Setup your Axelar validator
• Setup your Ethereum node
• Minimum hardware requirements: CPU with 2+ cores, 4GB RAM, 600GB+ free storage space.
• MacOS or Ubuntu 20.04+
• Official Documentation

Steps

1. Install Docker
2. Install Arbitrum image
3. Configure vald

Install docker

sudo apt update && sudo apt install curl jq -y < "/dev/null"
curl -fsSL https://get.docker.com -o get-docker.sh && sh get-docker.sh

Install Arbitrum node

Get the latest arbitrum version/docker image to use from the official docs. It should look something like offchainlabs/nitro-node:vx.y.z-commit.

mkdir -p $HOME/data/arbitrum
chmod -fR 777 $HOME/data/arbitrum

Now, you will see this flag in the command below --l1.url <YOUR_ETH_RPC_URL> this means that your arbitrum node needs a synced Ethereum node. Please provide the RPC URL of your synced Ethereum node with this flag.

docker run --rm -it -d -v /path/to/data/arbitrum:/home/user/.arbitrum -p 0.0.0.0:8547:8547 -p 0.0.0.0:8548:8548 <LATEST_DOCKER_IMAGE> --l1.url <YOUR_ETH_RPC_URL> --l2.chain-id=42161 --http.api=net,web3,eth,debug --http.corsdomain=* --http.addr=0.0.0.0 --http.vhosts=* --init.url="https://snapshot.arbitrum.io/mainnet/nitro.tar"

docker run --rm -it -d -v /path/to/data/arbitrum:/home/user/.arbitrum -p 0.0.0.0:8547:8547 -p 0.0.0.0:8548:8548 <LATEST_DOCKER_IMAGE> --l1.url <YOUR_GOERLI_ETH_RPC_URL> --l2.chain-id=421613 --http.api=net,web3,eth,debug --http.corsdomain=* --http.addr=0.0.0.0 --http.vhosts=*

Verify sync status

To verify if your node is in sync you can check the latest block from the explorer. Compare it with what you have in docker ps -q | xargs -L 1 docker logs --tail 10 -f

• Mainnet Explorer
• Testnet Explorer

Test RPC connection

Once your node is fully synced, the output from above will say false. To test your Arbitrum RPC node, you can send an RPC request using cURL

curl -X POST http://localhost:8547 \
  -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}'

If you are testing it remotely, please replace localhost with the IP or URL of your server.

Configure vald

In order for vald to connect to your Arbitrum node, your rpc_addr should be exposed in vald’s config.toml

[[axelar_bridge_evm]]
name = "arbitrum"
rpc_addr = "http://IP:PORT"
start-with-bridge = true

[[axelar_bridge_evm]]
name = "arbitrum"
rpc_addr = "http://IP:PORT"
start-with-bridge = true