Teku

Overview

PegaSys Teku (formerly known as Artemis) is a Java-based Ethereum client designed & built to meet institutional needs and security requirements. PegaSys is an arm of ConsenSys dedicated to building enterprise-ready clients and tools for interacting with the core Ethereum platform. Teku is Apache 2 licensed and written in Java, a language notable for its materity & ubiquity.

Note: Teku is configured to run both validator client and beacon chain client in one process.

Official Links

Subject	Links
Releases	https://github.com/ConsenSys/teku/releases
Documentation	https://docs.teku.consensys.net/introduction
Website	https://consensys.net/knowledge-base/ethereum-2/teku

1. Initial configuration

Create a service user for the consensus service, create data directory and assign ownership.

sudo adduser --system --no-create-home --group consensus
sudo mkdir -p /var/lib/teku
sudo chown -R consensus:consensus /var/lib/teku

Install dependencies.

sudo apt install curl ccze openjdk-17-jdk libsnappy-dev libc6-dev jq git libc6 unzip -y

2. Install Binaries

• Downloading binaries is often faster and more convenient.

• Building from source code can offer better compatibility and is more aligned with the spirit of FOSS (free open source software).

Option 1 - Download binaries

Run the following to automatically download the latest linux release, un-tar and cleanup.

RELEASE_URL="https://api.github.com/repos/ConsenSys/teku/releases/latest"
LATEST_TAG="$(curl -s $RELEASE_URL | jq -r ".tag_name")"
BINARIES_URL="https://artifacts.consensys.net/public/teku/raw/names/teku.tar.gz/versions/${LATEST_TAG}/teku-${LATEST_TAG}.tar.gz"
echo Downloading URL: $BINARIES_URL

cd $HOME
# Download
wget -O teku.tar.gz $BINARIES_URL
# Untar
tar -xzvf teku.tar.gz -C $HOME
# Rename folder
mv teku-* teku
# Cleanup
rm teku.tar.gz

Install the binaries.

sudo mv $HOME/teku /usr/local/bin/teku

Option 2 - Build from source code

Build the binaries.

mkdir -p ~/git
cd ~/git
git clone https://github.com/ConsenSys/teku.git
cd teku
# Get new tags
git fetch --tags
RELEASETAG=$(curl -s https://api.github.com/repos/ConsenSys/teku/releases/latest | jq -r .tag_name)
git checkout tags/$RELEASETAG
./gradlew distTar installDist

Verify Teku was built properly by displaying the version.

cd $HOME/git/teku/build/install/teku/bin
./teku --version

Install the binaries.

sudo cp -a $HOME/git/teku/build/install/teku /usr/local/bin/teku

3. Setup and configure systemd

Create a systemd unit file to define your consensus.service configuration.

sudo nano /etc/systemd/system/consensus.service

Paste the following configuration into the file.

Standalone Beacon Node (Recommended)

[Unit]
Description=Teku Beacon Node Consensus Client service for Holesky
Wants=network-online.target
After=network-online.target
Documentation=https://www.nodebridgeafrica.com

[Service]
Type=simple
User=consensus
Group=consensus
Restart=on-failure
RestartSec=3
KillSignal=SIGINT
TimeoutStopSec=900
Environment=JAVA_OPTS=-Xmx6g
Environment=TEKU_OPTS=-XX:-HeapDumpOnOutOfMemoryError
ExecStart=/usr/local/bin/teku/bin/teku \
  --network=holesky \
  --data-path=/var/lib/teku/ \
  --data-storage-mode="minimal" \
  --initial-state="https://holesky.beaconstate.ethstaker.cc" \
  --ee-endpoint=http://127.0.0.1:8551 \
  --ee-jwt-secret-file=/secrets/jwtsecret \
  --rest-api-enabled=true \
  --rest-api-port=5052 \
  --p2p-port=9000 \
  --p2p-peer-upper-bound=100 \
  --p2p-peer-lower-bound=60 \
  --metrics-enabled=true \
  --metrics-port=8008 \
  --validators-proposer-default-fee-recipient=<0x_CHANGE_THIS_TO_MY_ETH_FEE_RECIPIENT_ADDRESS>

[Install]
WantedBy=multi-user.target

• Replace**<0x_CHANGE_THIS_TO_MY_ETH_FEE_RECIPIENT_ADDRESS>** with your own Ethereum address that you control. Tips are sent to this address and are immediately spendable.

• Not staking? If you only want a full node, delete the line beginning with

--validators-proposer-default-fee-recipient

To exit and save, press Ctrl + X, then Y, then Enter.

Combined BN+VC

Run the following to enable auto-start at boot time.

sudo systemctl daemon-reload
sudo systemctl enable consensus

Finally, start your consensus layer client and check it's status.

sudo systemctl start consensus
sudo systemctl status consensus

Press Ctrl + C to exit the status.

Check your logs to confirm that the consensus clients are up and syncing.

sudo journalctl -fu consensus | ccze

Example of Synced Consensus Client Logs

teku[64122]: 02:24:28.010 INFO  - Slot Event  *** Slot: 19200, Block: 1468A43F874EDE790DB6B499A51003500B5BA85226E9500A7A187DB9A169DE20, Justified: 1132, Finalized: 1133, Peers: 70
teku[64122]: 02:24:40.010 INFO  - Slot Event  *** Slot: 19200, Block: 72B092AADFE146F5D3F395A720C0AA3B2354B2095E3F10DC18F0E9716D286DCB, Justified: 1132, Finalized: 1133, Peers: 70

4. Helpful consensus client commands

View Logs

sudo journalctl -fu consensus | ccze

Example of Synced Teku Consensus Client Logs

teku[64122]: 02:24:28.010 INFO  - Slot Event  *** Slot: 19200, Block: 1468A43F874EDE790DB6B499A51003500B5BA85226E9500A7A187DB9A169DE20, Justified: 1132, Finalized: 1133, Peers: 70
teku[64122]: 02:24:40.010 INFO  - Slot Event  *** Slot: 19200, Block: 72B092AADFE146F5D3F395A720C0AA3B2354B2095E3F10DC18F0E9716D286DCB, Justified: 1132, Finalized: 1133, Peers: 70

Stop

Start

View Status

Reset Database

Now that your consensus client is configured and started, you have a full node.

Proceed to the next step on setting up your validator client, which turns a full node into a staking node.

If you wanted to setup a full node, not a staking node, stop here! Congrats on running your own full node! 🎉