Node Operations

Geth Configuration

# Create data directory
mkdir -p /var/lib/geth

# Create service file
cat > /etc/systemd/system/geth.service << EOF
[Unit]
Description=Geth Execution Client
After=network.target
Wants=network.target

[Service]
User=geth
Group=geth
Type=simple
Restart=always
RestartSec=5
ExecStart=/usr/local/bin/geth \
  --mainnet \
  --datadir /var/lib/geth \
  --http \
  --http.addr 0.0.0.0 \
  --http.port 8545 \
  --http.api eth,net,web3,engine,admin \
  --ws \
  --ws.addr 0.0.0.0 \
  --ws.port 8546 \
  --authrpc.addr localhost \
  --authrpc.port 8551 \
  --authrpc.vhosts localhost \
  --authrpc.jwtsecret /var/lib/geth/jwt.hex \
  --metrics \
  --metrics.addr 0.0.0.0 \
  --metrics.port 6060 \
  --syncmode snap \
  --maxpeers 50

[Install]
WantedBy=multi-user.target
EOF

# Generate JWT secret
openssl rand -hex 32 > /var/lib/geth/jwt.hex

# Start service
sudo systemctl daemon-reload
sudo systemctl enable geth
sudo systemctl start geth

Nethermind Configuration

cat > /etc/systemd/system/nethermind.service << EOF
[Unit]
Description=Nethermind Execution Client
After=network.target

[Service]
User=nethermind
Type=simple
Restart=always
ExecStart=/usr/local/bin/nethermind \
  --config mainnet \
  --datadir /var/lib/nethermind \
  --JsonRpc.Enabled true \
  --JsonRpc.Host 0.0.0.0 \
  --JsonRpc.Port 8545 \
  --JsonRpc.JwtSecretFile /var/lib/nethermind/jwt.hex \
  --JsonRpc.EngineHost 127.0.0.1 \
  --JsonRpc.EnginePort 8551 \
  --Metrics.Enabled true \
  --Metrics.ExposePort 6060 \
  --Sync.SnapSync true

[Install]
WantedBy=multi-user.target
EOF

Consensus Client Setup

Lighthouse

# Install Lighthouse
curl -LO https://github.com/sigp/lighthouse/releases/download/v4.5.0/lighthouse-v4.5.0-x86_64-unknown-linux-gnu.tar.gz
tar -xvf lighthouse-*.tar.gz
sudo mv lighthouse /usr/local/bin/

# Beacon node service
cat > /etc/systemd/system/lighthouse-beacon.service << EOF
[Unit]
Description=Lighthouse Beacon Node
After=network.target geth.service
Wants=geth.service

[Service]
User=lighthouse
Type=simple
Restart=always
ExecStart=/usr/local/bin/lighthouse bn \
  --network mainnet \
  --datadir /var/lib/lighthouse \
  --execution-endpoint http://localhost:8551 \
  --execution-jwt /var/lib/geth/jwt.hex \
  --checkpoint-sync-url https://beaconstate.ethstaker.cc \
  --http \
  --http-address 0.0.0.0 \
  --http-port 5052 \
  --metrics \
  --metrics-address 0.0.0.0 \
  --metrics-port 5054

[Install]
WantedBy=multi-user.target
EOF

Prysm

# Install Prysm
curl https://raw.githubusercontent.com/prysmaticlabs/prysm/master/prysm.sh --output prysm.sh
chmod +x prysm.sh

# Beacon node service
cat > /etc/systemd/system/prysm-beacon.service << EOF
[Unit]
Description=Prysm Beacon Node
After=network.target

[Service]
User=prysm
Type=simple
Restart=always
ExecStart=/usr/local/bin/prysm.sh beacon-chain \
  --mainnet \
  --datadir=/var/lib/prysm \
  --execution-endpoint=http://localhost:8551 \
  --jwt-secret=/var/lib/geth/jwt.hex \
  --checkpoint-sync-url=https://beaconstate.ethstaker.cc \
  --genesis-beacon-api-url=https://beaconstate.ethstaker.cc \
  --grpc-gateway-host=0.0.0.0 \
  --grpc-gateway-port=3500 \
  --monitoring-host=0.0.0.0 \
  --monitoring-port=8080

[Install]
WantedBy=multi-user.target
EOF

Validator Setup

Key Generation

# Install deposit-cli
wget https://github.com/ethereum/staking-deposit-cli/releases/download/v2.7.0/staking_deposit-cli-fdab65d-linux-amd64.tar.gz
tar -xvf staking_deposit-cli-*.tar.gz

# Generate validator keys
./deposit new-mnemonic --num_validators 1 --chain mainnet

# Import keys to Lighthouse
lighthouse account validator import \
  --network mainnet \
  --datadir /var/lib/lighthouse \
  --directory validator_keys

# Import keys to Prysm
./prysm.sh validator accounts import \
  --mainnet \
  --keys-dir=validator_keys

Validator Client

# Lighthouse validator service
cat > /etc/systemd/system/lighthouse-validator.service << EOF
[Unit]
Description=Lighthouse Validator
After=lighthouse-beacon.service
Wants=lighthouse-beacon.service

[Service]
User=lighthouse
Type=simple
Restart=always
ExecStart=/usr/local/bin/lighthouse vc \
  --network mainnet \
  --datadir /var/lib/lighthouse \
  --beacon-nodes http://localhost:5052 \
  --graffiti "MyValidator" \
  --metrics \
  --metrics-address 0.0.0.0 \
  --metrics-port 5064 \
  --suggested-fee-recipient 0xYourAddress

[Install]
WantedBy=multi-user.target
EOF

MEV-Boost Setup

# Install MEV-Boost
go install github.com/flashbots/mev-boost@latest

# MEV-Boost service
cat > /etc/systemd/system/mev-boost.service << EOF
[Unit]
Description=MEV-Boost
After=network.target

[Service]
User=mevboost
Type=simple
Restart=always
ExecStart=/usr/local/bin/mev-boost \
  -mainnet \
  -relay-check \
  -relay https://0xac6e77dfe25ecd6110b8e780608cce0dab71fdd5ebea22a16c0205200f2f8e2e3ad3b71d3499c54ad14d6c21b41a37ae@boost-relay.flashbots.net \
  -relay https://0xa1559ace749633b997cb3fdacffb890aeebdb0f5a3b6aaa7eeeaf1a38af0a8fe88b9e4b1f61f236d2e64d95733327a62@relay.ultrasound.money

[Install]
WantedBy=multi-user.target
EOF

Monitoring

Prometheus Configuration

# prometheus.yml
scrape_configs:
  - job_name: 'geth'
    static_configs:
      - targets: ['localhost:6060']

  - job_name: 'lighthouse_beacon'
    static_configs:
      - targets: ['localhost:5054']

  - job_name: 'lighthouse_validator'
    static_configs:
      - targets: ['localhost:5064']

Useful Monitoring Commands

# Check Geth sync status
geth attach http://localhost:8545 --exec "eth.syncing"

# Check Lighthouse sync status
curl -s http://localhost:5052/eth/v1/node/syncing | jq

# Check validator status
curl -s http://localhost:5052/eth/v1/beacon/states/head/validators/0x... | jq

# Check peer count
geth attach --exec "admin.peers.length"
curl -s http://localhost:5052/eth/v1/node/peers | jq '.data | length'

Archive Node Configuration

# Geth archive mode
ExecStart=/usr/local/bin/geth \
  --mainnet \
  --datadir /var/lib/geth \
  --gcmode archive \
  --syncmode full \
  # ... other flags

# Erigon (optimized for archive)
ExecStart=/usr/local/bin/erigon \
  --datadir /var/lib/erigon \
  --chain mainnet \
  --prune=htc \
  # ... other flags

Process Integration

Best Practices

1. Use checkpoint sync for faster initial sync
2. Monitor disk space (archive nodes need TBs)
3. Set up alerting for missed attestations
4. Keep clients updated
5. Use separate machines for execution and consensus
6. Backup validator keys securely

See Also

• agents/blockchain-infra/AGENT.md - Infrastructure expert
• Ethereum.org Staking
• EthStaker