# Chainbridge Setup Guide

To setup a production chainbridge for zero.exchange we will need to setup:

1) an Avalanche node
2) an Ethereum node (optional)
3) a Chainbridge relayer

Skip sections 1 and 2 for now and just go to step 3

## 1) Setup Avalanche Node

The full guide can be found here: https://docs.avax.network/build/get-started

Once you have it running on your server, create a systemctl script with the following:

`vi /etc/systemd/system/`

and save the following script as avalanche.service:

[Unit]
Description=Avalanche node
After=network.target

[Service]
Type=simple
Restart=always
RestartSec=1
ExecStart=/root/avalanchego --public-ip=167.99.178.42 --http-port=9650

[Install]
WantedBy=default.target

This should ensure the avalanche node is always running, even after crashes or system reboots.

## 2) Optional: Run an Ethereum node

Currently, the setup uses infura.io or other ethereum node hosting providers for reliability.

## 3) Setup ChainBridge Relayer

Clone the repo and install dependencies

git clone https://github.com/zeroexchange/gondola
sudo apt update
sudo apt install make
sudo apt install build-essential
wget -c https://dl.google.com/go/go1.14.2.linux-amd64.tar.gz -O - | sudo tar -xz -C /usr/local
vi ~/.profile
export PATH=$PATH:/usr/local/go/bin
source ~/.profile

Configure chainbridge with the following commands:

make build
# Generate a new public/private key and make a note of the public address
cd build && ./chainbridge accounts import --privateKey <your ethereum private key here>
vi /build/config.json

Change the "from" field on both chains to the public key you just imported, and note the KEYSTORE_PASSWORD you just entered for the next step.

./build/chainbridge

then create a systemctl script with the following:

vi /etc/systemd/system/chainbridge.service

and save the following script as chainbridge.service:

[Unit]
Description=Chainbridge Relayer

[Service]
User=root
TimeoutStartSec=0
Type=simple
KillMode=process
WorkingDirectory=/root/gondola/build
ExecStart=/root/gondola/build/chainbridge
Restart=always
RestartSec=2
Environment="KEYSTORE_PASSWORD=<your keystore password here>"

[Install]
WantedBy=multi-user.target

This should ensure the avalanche node is always running, even after crashes or system reboots.

systemctl enable chainbridge
systemctl start chainbridge

You can check if it is running properly with

journalctl -u chainbridge.service -b

## Run the services and confirm it is operating correctly

Run the Avalanche service:

systemctl enable avalanche
systemctl start avalanche

Test avalanche is running correctly with

curl -X POST --data '{
    "jsonrpc":"2.0",
    "id"     :1,
    "method" :"info.isBootstrapped",
    "params": {
        "chain":"X"
    }
}' -H 'content-type:application/json;' 127.0.0.1:9650/ext/info

this should return isBootstrapped: true in the json response (might take some time to get synced). Once this is true, run the chainbridge service: