kurtosis-ethereum

name	kurtosis-ethereum
description	Run Ethereum multi-client devnets using Kurtosis and the ethpandaops/ethereum-package. Use for spinning up local devnets, syncing public testnets, validating cross-client interop, testing fork transitions, shadowforks, running assertoor checks, debugging CL/EL client interactions, or verifying new feature implementations across multiple consensus and execution clients.
allowed-tools	Bash, Read, Write, Edit, WebFetch, Glob, Grep

Kurtosis Devnet

Run Ethereum consensus/execution client devnets via kurtosis + ethereum-package.

Config Principle

Only include fields that differ from defaults. If the task doesn't mention a setting, don't include it. Shorter configs are better — let the defaults handle the rest.

Quick Start

# ALWAYS start grafloki first — enables Loki log collection for debugging
kurtosis loki start

# Write a network_params.yaml, then:
kurtosis run github.com/ethpandaops/ethereum-package \
  --enclave <name> \
  --args-file network_params.yaml \
  --image-download always

kurtosis enclave ls                    # list enclaves
kurtosis enclave inspect <name>        # inspect services + ports
kurtosis service logs <enclave> <svc>  # view logs
kurtosis enclave rm -f <name>          # cleanup

If you are told to use a fork or a branch of the ethereum-package, then replace github.com/ethpandaops/ethereum-package with github.com//ethereum-package@branch

If you want to quickly sanity check something, then use preset: "minimal". This will lead to much faster networks, but do not default to this approach. Only use it when you are sure you want to quickly check something. When the user expects it to behave like mainnet, then use preset: "mainnet".

Config Structure (network_params.yaml)

participants

Each entry is a CL+EL node. Only specify fields you need to override:

participants:
  - el_type: geth           # geth, reth, nethermind, besu, erigon
    cl_type: lighthouse      # lighthouse, lodestar, prysm, teku, nimbus

Available overrides (only use when needed):

• el_image / cl_image / vc_image — custom Docker images
• el_extra_params / cl_extra_params / vc_extra_params — extra CLI flags
• el_max_cpu / el_max_mem / cl_max_cpu / cl_max_mem — resource limits (millicores / MB)
• vc_type — separate validator client type (creates a dedicated vc service)
• use_remote_signer: true + remote_signer_type: web3signer — remote signing
• count — number of identical instances (default: 1)
• validator_count — validators assigned (default: from network config)

network_params

Network-level settings. Only include fields you need to change. Use kurtosis-ref.sh search <term> to find exact field names — do not guess.

network_params:
  # Only add fields the task requires. Examples of available settings:
  # preset, seconds_per_slot, fork epochs, gas limits, etc.
  # Verify field names with: bash .claude/skills/kurtosis-ethereum/kurtosis-ref.sh search <term>

additional_services

additional_services:
  - dora                     # block explorer
  - assertoor                # automated testing

Reference Tool

One script for all lookups. Use targeted sections instead of all.

bash .claude/skills/kurtosis-ethereum/kurtosis-ref.sh <section>

Section	What it shows
clients	Supported EL/CL/VC client types
participants	Participant fields with defaults
network	network_params fields with defaults
forks	Fork epoch fields and defaults
mev	MEV types and params
services	Additional services list
sections	Config subcategory and root-level params
search <term>	Search the README for a field/concept
example <name>	Fetch a real CI test config (e.g. remote-signer, minimal, mix)
examples	List all available CI test configs

Use targeted sections instead of dumping everything. For example:

• Need to know MEV options? kurtosis-ref.sh mev
• Unsure about a field name? kurtosis-ref.sh search gas_limit
• Need fork epoch names? kurtosis-ref.sh forks
• Setting up something complex? kurtosis-ref.sh example remote-signer to see a working CI config

Service Naming Convention

• EL: el-{index}-{el_type}-{cl_type}
• CL: cl-{index}-{cl_type}-{el_type}
• VC: vc-{index}-{el_type}-{cl_type}-{vc_type} (only when vc_type differs from cl_type)

Examples

2-node devnet

participants:
  - el_type: geth
    cl_type: lodestar
  - el_type: reth
    cl_type: lighthouse

network_params:
  preset: minimal

Mixed clients with monitoring

participants:
  - el_type: geth
    cl_type: lighthouse
  - el_type: nethermind
    cl_type: prysm
  - el_type: besu
    cl_type: teku

network_params:
  preset: minimal

additional_services:
  - dora
  - assertoor

assertoor_params:
  run_stability_check: true

Custom images

participants:
  - el_type: geth
    el_image: ethpandaops/geth:my-branch
    cl_type: lighthouse
    cl_image: ethpandaops/lighthouse:my-branch

network_params:
  preset: minimal

Observer node (no validators)

participants:
  - el_type: geth
    cl_type: lighthouse
    validator_count: 0

network_params:
  preset: minimal

Monitoring

# Check finality
curl -s http://127.0.0.1:<cl-port>/eth/v1/beacon/states/head/finality_checkpoints | jq

# Check peers
curl -s http://127.0.0.1:<cl-port>/eth/v1/node/peers | jq '.data | length'

Finality requires ~6-8 min after genesis with default settings (32 slots/epoch, 12s/slot).

Troubleshooting

Issue	Fix
Image not found	Verify image exists in registry; use --image-download always
Port conflicts	May be conflicting enclaves, ask user how to proceed