How to Deploy a Chainlink node with an Ethereum Client

Posted By : Shivam Grover | 31-Aug-2020

What is Chainlink?

 

ChainLink is a network(decentralized) of computing nodes. It provides us information/data from off-blockchain sources to on blockchain smart contracts with the help of oracles. It bridges the gap between smart-contracts on blockchain and real-world applications.

 

The data between the blockchain and the real world is known as “oracles”.

 

Developed by a company named SmartContract founded in 2014.

 

 

Prerequisites

 

  • Docker- CE
  • PSQL Database
  • Terminal (Command Line)

 

Installing Docker

 

> curl -sSL https://get.docker.com/ | sh

> sudo usermod -aG docker $USER

> Exit

# log in again

 

Setting Up an Ethereum Client

 

To run a ChainLink full node, you first need an Ethereum client with a websocket connection(ws/wss).

 

Download the latest eth client version from dockerhub:

 

docker pull ethereum/client-go:latest

 

Run the container:

 

docker run --name eth -p 8546:8546 -v ~/.geth:/geth -it ethereum/client-go --syncmode fast --ws --ipcdisable --wsaddr 0.0.0.0 --wsorigins="*" --datadir /geth

 

Once the Eth node is synced completely we can run the chainlink node.

 

Create an Environment File

 

mkdir ~/.chainlink

 

echo "ROOT=/chainlink

LOG_LEVEL=debug

ETH_CHAIN_ID=1

CHAINLINK_TLS_PORT=0

SECURE_COOKIES=false

GAS_UPDATER_ENABLED=true

ALLOW_ORIGINS=*" > ~/.chainlink/.env

 

Now run the following command to add the Ethereum WebSocket URL to the environment file.

 

echo "ETH_URL=ws://$ETH_CONTAINER_IP:8546" >> ~/.chainlink/.env


 

Run the following command to add the PSQL Databases URL to the environment file

 

echo "DATABASE_URL=postgresql://$USERNAME:[email protected]$SERVER:$PORT/$DATABASE" >> ~/.chainlink-ropsten/.env

 

Start the Chainlink Node

 

Now you can run the Docker image:

 

cd  docker run -p 6688:6688 -v ~/.chainlink:/chainlink -it --env-file=.env smartcontract/chainlink local n


 

The first time running this docker image(smartcontract/chainlink ), it will ask for a password. This password will be your wallet password that you can use to unlock the keystore file generated for you. Then, you'll see a prompt to enter an API Email-address and Password.

 



 

 

Now you connect to your Chainlink node's user interface by opening  http://localhost:6688 in your web browser.

 

That’s it. Your Chainlink full node is all set now and you can now easily interact with the smart-contracts on chainlink network and the Blockchain. Now, you can add some jobs and play around with the node

 

About Author

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Shivam Grover

Shivam is a DevOps Enginner. He has a great knowledge in Cloud technologies and DevOps tools. Experienced with CICD implementation and microservices architecture.

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