The Obol Stack: Run Blockchain Networks Locally

Overview

The Obol Stack is a framework to make it easier to distribute and run blockchain networks and decentralised applications (dApps) locally. The stack is built on Kubernetes, with Helm as a package management system.

The Obol Stack provides a deployment-centric approach where you can easily install and manage multiple blockchain network instances (Ethereum, Aztec, etc.) with configurable clients and settings. Each network installation creates a unique deployment instance with its own namespace, resources, and configuration - allowing you to run mainnet and testnet side-by-side, or test different client combinations independently.

Getting Started

Important

The Obol Stack is alpha software. It is not complete, and it may not be working smoothly. If you encounter an issue that does not appear to be documented, please open a GitHub issue if an appropriate one is not already present.

Prerequisites

The Obol Stack requires Docker to run a local Kubernetes cluster. Install Docker:

Linux: Follow the Docker Engine installation guide
macOS/Windows: Install Docker Desktop

Installation

The easiest way to install the Obol Stack is using the obolup bootstrap installer.

Run the installer with:

bash <(curl -s https://stack.obol.org)

What the installer does:

Verifies Docker is running
Installs the obol CLI binary to ~/.local/bin/obol
Installs required dependencies (kubectl, helm, k3d, helmfile, k9s) to ~/.local/bin/
Adds obol.stack to your /etc/hosts file (requires sudo) to enable local domain access
Prompts you to add ~/.local/bin to your PATH by updating your shell profile
Prompts you to start the cluster and open the Obol application in your browser

PATH Configuration:

The installer will detect your shell (bash/zsh) and ask if you want to automatically add ~/.local/bin to your PATH. If you choose automatic configuration, it will add this line to your shell profile (~/.bashrc or ~/.zshrc):

export PATH="$HOME/.local/bin:$PATH"

After installation, reload your shell configuration:

# For bash
source ~/.bashrc

# For zsh
source ~/.zshrc

Manual PATH Configuration:

If you prefer to configure PATH manually, add this line to your shell profile:

# Add to ~/.bashrc (bash) or ~/.zshrc (zsh)
export PATH="$HOME/.local/bin:$PATH"

Then reload your shell or start a new terminal session.

Using obol without PATH:

If you haven't added ~/.local/bin to your PATH, you can always run commands directly:

~/.local/bin/obol version
~/.local/bin/obol stack init

Verify the installation:

obol version

Quick Start

Once installed, you can start your local Ethereum stack with a few commands:

# Initialize the stack configuration
obol stack init

# Start the Kubernetes cluster
obol stack up

# Install a blockchain network (creates a unique deployment)
obol network install ethereum
# This creates a deployment like: ethereum-nervous-otter

# Install another network configuration
obol network install ethereum --network=holesky
# This creates a separate deployment like: ethereum-happy-panda

# View cluster resources (opens interactive terminal UI)
obol k9s

The stack will create a local Kubernetes cluster. Each network installation creates a uniquely-namespaced deployment instance, allowing you to run multiple configurations simultaneously.

Tip

Use obol network list to see all available networks. Customize installations with flags (e.g., obol network install ethereum --network=holesky --execution-client=geth) to create different deployment configurations.

Managing Networks

The Obol Stack uses a deployment-centric architecture where each network installation creates an isolated deployment instance that can be installed, configured, and removed independently. You can run multiple deployments of the same network type with different configurations.

List Available Networks

View all network types that can be installed:

obol network list

Available networks:

ethereum - Full Ethereum node (execution + consensus clients)
helios - Lightweight Ethereum client
aztec - Aztec rollup network

View installed deployments:

# List all network deployment namespaces
obol kubectl get namespaces | grep -E "ethereum|helios|aztec"

# View resources in a specific deployment
obol kubectl get all -n ethereum-nervous-otter

Install a Network

Install a network with default configuration:

obol network install ethereum

Each network installation creates a unique deployment instance with:

Network configuration templated and saved to ~/.config/obol/networks/ethereum/<namespace>/
Resources deployed to a unique Kubernetes namespace (e.g., ethereum-nervous-otter)
Isolated persistent storage for blockchain data

Multiple deployments:

You can install the same network type multiple times with different configurations. Each deployment is isolated in its own namespace:

# Install mainnet with Geth + Prysm
obol network install ethereum --network=mainnet --execution-client=geth --consensus-client=prysm
# Creates: ethereum-nervous-otter namespace

# Install Holesky testnet with Reth + Lighthouse
obol network install ethereum --network=holesky --execution-client=reth --consensus-client=lighthouse
# Creates: ethereum-laughing-elephant namespace

# Install another Holesky instance for testing
obol network install ethereum --network=holesky
# Creates: ethereum-happy-panda namespace

Ethereum configuration options:

--network: Choose network (mainnet, sepolia, holesky, hoodi)
--execution-client: Choose execution client (reth, geth, nethermind, besu, erigon, ethereumjs)
--consensus-client: Choose consensus client (lighthouse, prysm, teku, nimbus, lodestar, grandine)

Tip

Use obol network install <network> --help to see all available options for a specific network

Network Architecture

Unique deployment instances:

Each network installation creates an isolated deployment with a unique namespace (e.g., ethereum-nervous-otter). This allows you to:

Run multiple instances of the same network type (e.g., mainnet and testnet)
Test different client combinations without conflicts
Independently manage, update, and delete deployments

Per-deployment resources:

Unique namespace: All Kubernetes resources isolated (e.g., ethereum-nervous-otter, ethereum-happy-panda)
Configuration files: Templated helmfile saved to ~/.config/obol/networks/ethereum/<namespace>/
Persistent volumes: Blockchain data stored in ~/.local/share/obol/<cluster-id>/networks/<network>_<namespace>/
Service endpoints: Internal cluster DNS per deployment (e.g., ethereum-rpc.ethereum-nervous-otter.svc.cluster.local)

Two-stage templating:

CLI flags template the helmfile values section with your configuration
Helmfile processes the template and deploys to the cluster
Configuration is saved locally for future updates and management

Delete a Network Deployment

Remove a specific network deployment instance and clean up all associated resources:

# List all deployments to find the namespace
obol kubectl get namespaces | grep ethereum

# Delete a specific deployment
obol network delete ethereum-nervous-otter

# Skip confirmation prompt
obol network delete ethereum-nervous-otter --force

This command will:

Remove the deployment configuration from ~/.config/obol/networks/ethereum/<namespace>/
Delete the Kubernetes namespace and all deployed resources
Clean up associated persistent volumes and blockchain data

Warning

Deleting a deployment removes all associated data and resources. Use with caution.

Note

You can have multiple deployments of the same network type. Deleting one deployment (e.g., ethereum-nervous-otter) does not affect other deployments (e.g., ethereum-happy-panda).

Managing the Stack

Start the stack:

obol stack up

Stop the stack:

obol stack down

View cluster (interactive UI):

obol k9s

View cluster logs:

obol kubectl logs -n <namespace> <pod-name>

Remove everything (including data):

obol stack purge -f

Warning

The purge command permanently deletes all cluster data and configuration. The -f flag is required to remove persistent volume claims (PVCs) owned by root. Use with caution.

Working with Kubernetes

The obol CLI includes convenient wrappers for common Kubernetes tools. These automatically use the correct cluster configuration:

# Kubectl (Kubernetes CLI)
obol kubectl get pods --all-namespaces

# Helm (Kubernetes package manager)
obol helm list --all-namespaces

# K9s (interactive cluster manager)
obol k9s

# Helmfile (declarative Helm releases)
obol helmfile list

Troubleshooting

Port 80 Already in Use

The Obol Stack is configured to run on ports 80 and 443 by default. If you have another service using these ports, the cluster may fail to start.

To fix this:

Edit the k3d configuration file:
```
$EDITOR ~/.config/obol/k3d.yaml
```

Find the ports section that looks like this:

ports:
  - port: 80:80
    nodeFilters:
      - loadbalancer
  - port: 8080:80
    nodeFilters:
      - loadbalancer
  - port: 443:443
    nodeFilters:
      - loadbalancer
  - port: 8443:443
    nodeFilters:
      - loadbalancer

Remove the 80:80 and 443:443 entries (keep the 8080 and 8443 entries):

ports:
  - port: 8080:80
    nodeFilters:
      - loadbalancer
  - port: 8443:443
    nodeFilters:
      - loadbalancer

Restart the cluster:
```
obol stack down
obol stack up
```

After this change, access the Obol Stack frontend using port 8080:

Obol Stack: http://obol.stack:8080 (or http://localhost:8080)

Tip

If ports 8080 or 8443 are also in use, you can change them to any available port. For example, change 8080:80 to 9090:80 and 8443:443 to 9443:443. Then access the application at http://obol.stack:9090 or http://localhost:9090

Where Files Are Stored

The Obol Stack follows the XDG Base Directory specification:

Configuration: ~/.config/obol/ - Cluster config, kubeconfig, default resources, network deployments
Data: ~/.local/share/obol/ - Persistent volumes for network blockchain data
Binaries: ~/.local/bin/ - The obol CLI and dependencies

Configuration directory structure:

~/.config/obol/
├── k3d.yaml                       # Cluster configuration
├── .cluster-id                    # Unique cluster identifier
├── kubeconfig.yaml                # Kubernetes access configuration
├── defaults/                      # Default stack resources
│   ├── helmfile.yaml              # Base stack configuration
│   ├── base/                      # Base Kubernetes resources
│   └── values/                    # Configuration templates (ERPC, frontend)
└── networks/                      # Installed network deployments
    ├── ethereum/                  # Ethereum network deployments
    │   ├── <namespace-1>/         # First deployment instance
    │   └── <namespace-2>/         # Second deployment instance
    ├── helios/                    # Helios network deployments
    └── aztec/                     # Aztec network deployments

Data directory structure:

~/.local/share/obol/
└── <cluster-id>/                  # Per-cluster data
    └── networks/                  # Network blockchain data
        ├── ethereum_<namespace>/  # Ethereum deployment instance data
        ├── helios_<namespace>/    # Helios deployment instance data
        └── aztec_<namespace>/     # Aztec deployment instance data

Uninstalling Obol Stack

To completely remove the Obol Stack from your system:

1. Stop and remove the cluster:

~/.local/bin/obol stack purge -f

Note

The -f flag is required to remove persistent volume claims (PVCs) that are owned by root. Without this flag, data volumes will remain on your system.

2. Remove Obol binaries:

rm -f ~/.local/bin/obol \
      ~/.local/bin/kubectl \
      ~/.local/bin/helm \
      ~/.local/bin/k3d \
      ~/.local/bin/helmfile \
      ~/.local/bin/k9s \
      ~/.local/bin/obolup.sh

3. Remove Obol directories:

rm -rf ~/.config/obol \
       ~/.local/share/obol \
       ~/.local/state/obol

Note

This process removes Obol binaries from ~/.local/bin/. If you installed kubectl, helm, k3d, helmfile, or k9s separately before installing Obol, make sure not to delete those binaries. The PATH configuration in your shell profile is left unchanged.

Updating the Stack

To update to the latest version, simply run the installer again:

curl -fsSL https://raw.githubusercontent.com/ObolNetwork/obol-stack/main/obolup.sh | bash

The installer will detect your existing installation and upgrade it safely.

Development Mode

If you're contributing to the Obol Stack or want to run it from source, you can use development mode.

Setting up development mode:

Clone the repository:

git clone https://github.com/ObolNetwork/obol-stack.git
cd obol-stack

Run the installer in development mode:
```
OBOL_DEVELOPMENT=true ./obolup.sh
```

What development mode does:

Uses a local .workspace/ directory instead of XDG directories (~/.config/obol, etc.)
Installs a wrapper script that runs the obol CLI using go run (no compilation needed)
Code changes are immediately reflected when you run obol commands
All cluster data and configuration are stored in .workspace/

Development workspace structure:

.workspace/
├── bin/                         # obol wrapper script and dependencies
├── config/                      # Cluster configuration
│   ├── k3d.yaml
│   ├── .cluster-id
│   ├── kubeconfig.yaml
│   ├── defaults/                # Default stack resources
│   │   ├── helmfile.yaml
│   │   ├── base/
│   │   └── values/
│   └── networks/                # Installed network deployments
│       ├── ethereum/            # Ethereum network deployments
│       │   ├── <namespace-1>/  # First deployment instance
│       │   └── <namespace-2>/  # Second deployment instance
│       ├── helios/
│       └── aztec/
└── data/                        # Persistent volumes (network data)

Making code changes:

Simply edit the Go source files and run obol commands as normal. The wrapper script automatically compiles and runs your changes:

# Edit source files
$EDITOR cmd/obol/main.go

# Run immediately - no build step needed
obol stack up

Network development:

Networks are embedded in the binary at internal/embed/networks/. Each network uses a two-stage templating approach:

Stage 1: CLI flag templating (Go templates)

# internal/embed/networks/ethereum/helmfile.yaml.gotmpl
values:
  # @enum mainnet,sepolia,holesky,hoodi
  # @default mainnet
  # @description Blockchain network to deploy
  - network: {{.Network}}
    # @enum reth,geth,nethermind,besu,erigon,ethereumjs
    # @default reth
    # @description Execution layer client
    executionClient: {{.ExecutionClient}}
    namespace: {{.Namespace}}

Stage 2: Helmfile templating (Helm values)

CLI flags populate the values section with user choices
Templated helmfile is saved to .workspace/config/networks/<network>/<namespace>/
Helmfile processes the template and deploys resources to the cluster

Adding a new network:

Create internal/embed/networks/<network-name>/helmfile.yaml.gotmpl
Add annotations in values section: @enum, @default, @description
Use Go template syntax for values: {{.FlagName}}
CLI automatically generates obol network install <network-name> with flags
Test with obol network list and obol network install <network-name>

Benefits of two-stage templating:

Local source of truth: Configuration saved in config directory
User can edit and re-sync deployments
Clear separation: CLI flags → values, helmfile → Kubernetes resources

Switching back to production mode:

First, purge the development cluster to remove root-owned PVCs, then remove the .workspace/ directory and reinstall:

obol stack purge -f
rm -rf .workspace
./obolup.sh

Note

The obol stack purge -f command is necessary to remove persistent volume claims (PVCs) owned by root. Without the -f flag, these files will remain and may cause issues.

Stack Architecture

The Obol Stack follows a deployment-centric architecture where each network installation creates an isolated, uniquely-namespaced deployment instance.

Deployment Isolation

Each network installation creates a unique deployment instance with:

Unique namespace: Each deployment gets a generated namespace (e.g., ethereum-nervous-otter)
Dedicated resources: CPU, memory, and storage allocated per deployment
Configuration files: Templated helmfile stored in ~/.config/obol/networks/<network>/<namespace>/
Persistent volumes: Blockchain data stored in ~/.local/share/obol/<cluster-id>/networks/<network>_<namespace>/
Service endpoints: Internal cluster DNS unique to each deployment
Independent lifecycle: Deploy, update, and delete each instance independently

Benefits of unique namespaces:

Run multiple instances of the same network type (mainnet + testnet)
Test different client combinations without conflicts
Isolate resources and prevent deployment collisions
Simple deletion: remove namespace to clean up all resources

Default Stack Resources

The stack includes default resources deployed in the defaults namespace:

ERPC (planned): Unified RPC load balancer and proxy
Obol Frontend (planned): Web interface for stack management
Base resources: Local path storage provisioner and core services

Default resources are configured via ~/.config/obol/defaults/helmfile.yaml and deployed automatically during obol stack up.

ERPC Integration (Planned)

The stack will include eRPC, a specialized Ethereum load balancer that:

Provides unified RPC endpoints for all network deployments
Automatically discovers and routes requests to deployment endpoints
Supports failover and load balancing across multiple clients
Can be configured with 3rd party RPC fallbacks

Network deployments will register their endpoints with ERPC, enabling seamless access to blockchain data across all deployed instances. For example:

http://erpc.defaults.svc.cluster.local/ethereum/mainnet → routes to mainnet deployment
http://erpc.defaults.svc.cluster.local/ethereum/holesky → routes to holesky deployment

Advanced Tooling

The obol CLI wraps standard Kubernetes tools for convenience. For advanced use cases, you can use the underlying tools directly:

# Kubernetes CLI - manage pods, services, deployments
obol kubectl get pods --all-namespaces

# Helm - manage Helm charts
obol helm list --all-namespaces

# K9s - interactive cluster manager
obol k9s

# Helmfile - declarative Helm releases
obol helmfile list

All commands automatically use the correct cluster configuration (KUBECONFIG).

Project Status

This project is currently in alpha, and should not be used in production.

The stack aims to support all popular Kubernetes backends and all Ethereum client types, with a developer experience designed to be useful for local app development, through to production deployment and management.

Contributing

Please see CONTRIBUTING.md for details.

License

This project is licensed under the Apache License 2.0.

Name		Name	Last commit message	Last commit date
Latest commit History 232 Commits
.github/workflows		.github/workflows
.helix		.helix
assets		assets
cmd/obol		cmd/obol
examples		examples
internal		internal
worker		worker
.envrc		.envrc
.envrc.local.example		.envrc.local.example
.gitignore		.gitignore
CLAUDE.md		CLAUDE.md
CONTRIBUTING.md		CONTRIBUTING.md
LICENSE		LICENSE
README.md		README.md
VERSION		VERSION
flake.lock		flake.lock
flake.nix		flake.nix
go.mod		go.mod
go.sum		go.sum
justfile		justfile
notes.md		notes.md
obolup.sh		obolup.sh

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The Obol Stack: Run Blockchain Networks Locally

Overview

Getting Started

Prerequisites

Installation

Quick Start

Managing Networks

List Available Networks

Install a Network

Network Architecture

Delete a Network Deployment

Managing the Stack

Working with Kubernetes

Troubleshooting

Port 80 Already in Use

Where Files Are Stored

Uninstalling Obol Stack

Updating the Stack

Development Mode

Stack Architecture

Deployment Isolation

Default Stack Resources

ERPC Integration (Planned)

Advanced Tooling

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The Obol Stack: Run Blockchain Networks Locally

Overview

Getting Started

Prerequisites

Installation

Quick Start

Managing Networks

List Available Networks

Install a Network

Network Architecture

Delete a Network Deployment

Managing the Stack

Working with Kubernetes

Troubleshooting

Port 80 Already in Use

Where Files Are Stored

Uninstalling Obol Stack

Updating the Stack

Development Mode

Stack Architecture

Deployment Isolation

Default Stack Resources

ERPC Integration (Planned)

Advanced Tooling

Project Status

Contributing

License

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