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Running a Chainlink node!

Ensure that your system is up to date and fully patched

Debian & Ubuntu

sudo apt update -y && sudo apt upgrade -y

CentOS & Amazon Linux

sudo yum update && sudo yum upgrade -y

Install what we can from the default repository:

Debian & Ubuntu

sudo apt -y install git build-essential net-tools vim apt-transport-https ca-certificates curl wget gnupg2 software-properties-common ntp screen postgresql

CentOS

sudo yum -y install git gcc gcc-c++ make openssl-devel net-tools vim ca-certificates curl wget gnupg2 ntp screen postgresql-server postgresql-contrib yum-utils

Amazon Linux

sudo yum -y install git gcc gcc-c++ make openssl-devel net-tools vim ca-certificates curl wget gnupg2 ntp screen postgresql96-server yum-utils

Start the ntp service

Debian & Ubuntu

sudo /etc/init.d/ntp start
sudo systemctl enable ntp

CentOS

sudo systemctl start ntpd
sudo update-rc.d ntpd enable

Amazon Linux

sudo /etc/init.d/ntpd start
sudo chkconfig ntpd on

Installing Docker

Debian

curl -fsSL https://download.docker.com/linux/$(. /etc/os-release; echo "$ID")/gpg | sudo apt-key add -
sudo add-apt-repository -y "deb [arch=amd64] https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") $(lsb_release -cs) stable"
sudo apt -y update
sudo apt -y install docker-ce

Ubuntu (17.04+, Artful doesn't have its own release yet, Zesty works fine)

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu zesty stable"
sudo apt -y update
sudo apt -y install docker-ce

CentOS

sudo yum-config-manager  --add-repo https://download.docker.com/linux/centos/docker-ce.repo
sudo yum -y install docker-ce
sudo systemctl start docker

Amazon Linux

sudo yum -y install docker
sudo /etc/init.d/docker start
sudo chkconfig docker on

Allow use of Docker commands without sudo (Not on Amazon Linux)

sudo gpasswd -a $USER docker
su $USER

(Optional) Start using screen

screen

If using a separate machine for your Ethereum node, skip to the PostgreSQL section

Set up Go 1.9.2

Download and install Go:

curl -O https://storage.googleapis.com/golang/go1.9.2.linux-amd64.tar.gz
tar -xvf go1.9.2.linux-amd64.tar.gz
sudo mv go /usr/local

Set the Go paths:

echo "export PATH=$PATH:/usr/local/go/bin" >> ~/.profile
source ~/.profile

Install Ethereum locally (geth)

git clone https://github.com/ethereum/go-ethereum.git && cd go-ethereum
make geth
./build/bin/geth --rpc --rpcaddr 172.17.0.1 --syncmode "light"

Running geth with the --fast option will also work instead of --syncmode "light", but you can't do both

Send it to the background with Ctrl+Z or create a new screen with Ctrl+A, C

Set up PostgreSQL (Debian & Ubuntu)

Replace 9.6 with your version number. You can find this with "ls /etc/postgresql"

cd /etc/postgresql/9.6/main/

If you're setting up the node with different IPs, change them here

sudo sh -c "echo \"listen_addresses = '172.17.0.1'\" >> postgresql.conf"
sudo sh -c "echo \"host all all 172.17.0.0/16 trust\" >> pg_hba.conf"

Start PostgreSQL

sudo /etc/init.d/postgresql restart
sudo update-rc.d postgresql enable

Set up PostgreSQL (CentOS)

Init the database

sudo postgresql-setup initdb

If you're setting up the node with different IPs, change them here

sudo su postgres 
cd /var/lib/pgsql/data
sh -c "echo \"listen_addresses = '172.17.0.1'\" >> postgresql.conf"
sh -c "echo \"host all all 172.17.0.0/16 trust\" >> pg_hba.conf"
exit

Start PostgreSQL

sudo systemctl start postgresql
sudo systemctl enable postgresql

Set up PostgreSQL (Amazon Linux)

Init the database

sudo service postgresql initdb

If you're setting up the node with different IPs, change them here

sudo su postgres 
cd /var/lib/pgsql9/data
sh -c "echo \"listen_addresses = '172.17.0.1'\" >> postgresql.conf"
sh -c "echo \"host all all 172.17.0.0/16 trust\" >> pg_hba.conf"
exit

Start PostgreSQL

sudo /etc/init.d/postgresql restart
sudo chkconfig docker on

Finally set up Chainlink:

cd
docker pull smartcontract/chainlink

Create a .env file

touch .env

You can also use POSTGRES_USER and POSTGRES_PASSWORD environment variables in the .env file if you set up a different user in PostgreSQL

echo "DATABASE_URL=postgresql://postgres@172.17.0.1:5432/nayru_development?encoding=utf8&pool=5&timeout=5000" >> .env
echo "ETHEREUM_URL=http://172.17.0.1:8545" >> .env
echo "ETHEREUM_EXPLORER_URL=https://etherscan.io" >> .env

Before running the next line, please change the password to something that you prefer

echo "PRIVATE_KEY_PASSWORD=passwordchangeme" >> .env

Run this to initialize the database:

docker run -it --env-file=.env smartcontract/chainlink rake oracle:initialize

It will ask if you're ready to print coordinator credentials to the screen. You need to actually type "Y" for it to print out the coordinators. Copy them into a text file.

And finally run this to actually start the node:

docker run -t --env-file=.env smartcontract/chainlink

Assignment creations use port 5100 by default, you could also specify a port using -p ####:#### in the command above to expose another port.

Test connection (should be up to date with current Ethereum block):

docker run -it --env-file=.env smartcontract/chainlink rails runner "puts Ethereum::Client.new.current_block_height"

Stopping the node

If you want to stop the ChainLink node, you need to kill the entire docker container.

First, get a list of running docker containers with:

docker ps

Look for the line where "image" is set to smartcontract/smartoracle. Copy the container id and use it in the following command: (e.g. docker kill 23e27b5e63fb)

docker kill CONTAINER_ID