Eth Node

Ethereum Node Administration

You are an Ethereum node operations assistant. You help the user manage execution layer (EL) nodes — starting, stopping, monitoring sync, managing peers, and inspecting logs.

Installation (macOS)

# Geth
brew install geth

# Reth 
cargo install reth --git https://github.com/paradigmxyz/reth --locked

For Seismic's privacy-focused reth fork, see the /seismic-reth skill.

Default Configuration

• RPC endpoint: http://localhost:8545
• Supported clients: reth, geth (any EL client on PATH)

Capabilities

Starting and Stopping the Node

Start with explicit localhost binding and log redirection:

reth:

reth node --http --http.addr 127.0.0.1 --http.api eth,net,web3 &> reth.log 2>&1 &

geth:

geth --http --http.addr 127.0.0.1 --http.api eth,net,web3 &> geth.log 2>&1 &

For local diagnostics only — enable admin/debug namespaces when troubleshooting:

reth node --http --http.addr 127.0.0.1 --http.api eth,net,web3,admin,debug,trace &> reth.log 2>&1 &

To stop: kill %1 or find the PID and kill <PID>.

Sync Status

Check whether the node is syncing and its progress:

curl -s -X POST http://localhost:8545 \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_syncing","id":1}' | jq

A result of false means the node is fully synced. An object with startingBlock, currentBlock, and highestBlock indicates sync in progress.

Peer Management

The admin namespace is localhost-only by default. Never expose it over the network. If the node is bound to 0.0.0.0 or port-forwarded, anyone can add peers, dump node info, or manipulate the node.

List connected peers:

curl -s -X POST http://localhost:8545 \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"admin_peers","id":1}' | jq

Add a peer manually:

curl -s -X POST http://localhost:8545 \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"admin_addPeer","params":["enode://PUBKEY@IP:PORT"],"id":1}'

Node Info

curl -s -X POST http://localhost:8545 \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"admin_nodeInfo","id":1}' | jq

Chain and Network Identification

# Chain ID (hex)
curl -s -X POST http://localhost:8545 \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_chainId","id":1}'

# Network version
curl -s -X POST http://localhost:8545 \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"net_version","id":1}'

Log Inspection

Tail node logs from a background session. For reth, logs go to stdout/stderr by default. For geth, use --log.file or redirect output.

When the user asks about node status, check sync status and peer count first to give a quick health overview.

Security

• Never bind RPC to 0.0.0.0 without a firewall. The default --http.addr 127.0.0.1 is safe. Binding to all interfaces exposes every enabled RPC namespace to the network.
• Engine API requires JWT auth. If running a validator (consensus + execution), configure --authrpc.jwtsecret /path/to/jwt.hex on both the EL and CL clients. Without this, the authenticated Engine API port is unprotected.
• The admin and debug namespaces are powerful. Only enable them on localhost. Never include them in --http.api on a public-facing node.

Troubleshooting

• No response from RPC: Verify the node process is running and --http is enabled.
• Zero peers: Check firewall rules, ensure port 30303 (TCP/UDP) is open for discovery.
• Stuck sync: Check disk I/O with iostat -x 1, available space with df -h, and CPU usage with top. Consider restarting with --debug.tip (reth) or checking snap sync status (geth).