Configuration

Gokku is configured via a gokku.yml file in your project root. This file defines your apps, environments, and deployment settings.

Minimal Configuration

The simplest gokku.yml:

apps:
  api:
    path: ./cmd/api

That's it! Everything else has sensible defaults.

Full Configuration

Here's a complete example with all options:

apps:
  api:
    path: ./cmd/api
    binary_name: api
    workdir: .
    go_version: "1.25"
    goos: linux
    goarch: amd64
    cgo_enabled: 0
    deployment:
      keep_releases: 5
      restart_policy: always
      restart_delay: 5

Configuration Sections

Apps

The main configuration section. Each app can have:

Basic Settings

apps:
  api:           # App name (required)
    lang: go            # Language (optional, default: go)

Build Configuration

path: ./cmd/api         # Path to main file/directory
workdir: .             # Working directory for build

# Go-specific settings
go_version: "1.25"      # Go version
goos: linux             # Target OS
goarch: amd64           # Target architecture
cgo_enabled: 0          # Enable CGO (0 or 1)

# Docker-specific settings
dockerfile: ./Dockerfile     # Custom Dockerfile path

Build Type Defaults:

Setting	Default	Description
path	(required)	Build path
workdir	.	Working directory
dockerfile	./Dockerfile	Dockerfile path
base_image	(language-specific)	Base Docker image

Deployment

Deployment settings:

    deployment:
      keep_releases: 5              # Number of releases to keep
      keep_images: 5                # Number of Docker images to keep
      restart_policy: unless-stopped # Docker restart policy
      restart_delay: 5              # Delay between restarts (seconds)

Defaults:

• keep_releases: 5
• keep_images: 5
• restart_policy: unless-stopped
• restart_delay: 5

User Configuration

User configuration is automatically detected from your git remote URL.

Example:

# Git remote format: user@host:path
gokku remote add api-production ubuntu@server
# The user 'ubuntu' is automatically extracted and used

No configuration needed - Gokku automatically uses the user from your git remote.

Configuration by Language

Go Application

apps:
  api:
    path: ./cmd/api
    go_version: "1.25"

Python Application

apps:
  worker:
    lang: python
    image: python:3.11-slim
    path: ./apps/worker

Node.js Application

apps:
  frontend:
    lang: nodejs
    image: node:20-alpine
    path: ./apps/frontend

Multi-App Configuration

Deploy multiple apps from one repository:

apps:
  api:
    path: ./cmd/api
  
  worker:
    path: ./cmd/worker
  
  ml-service:
    path: ./services/ml
    entrypoint: server.py

Each app gets:

• Separate Git repository
• Independent environments
• Isolated deployments

Validation

Gokku validates your configuration on deployment. Common errors:

Missing Required Fields

Error: app 'api' missing required field: build.path

Fix: Add build.path:

apps:
  api:
    path: ./cmd/api  # Required!

2. Version Control

Always commit gokku.yml:

git add gokku.yml
git commit -m "feat: add gokku configuration"

3. Document Custom Settings

Add comments for non-obvious settings:

apps:
  api:
    cgo_enabled: 1  # Required for SQLite

Examples

See Examples for real-world configurations:

• Go Application
• Python Application
• Docker Application
• Multi-App Project

Reference

Full configuration reference: Configuration Reference