109 lines
3.9 KiB
Markdown
109 lines
3.9 KiB
Markdown
# n8n Module
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This module deploys [n8n](https://n8n.io/), a workflow automation tool for technical people, as Docker containers in the homelab environment.
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## Overview
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The n8n module:
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- Deploys two Docker containers:
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- `n8n`: The main workflow automation server
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- `n8n-postgres`: A PostgreSQL database backend
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- Creates a dedicated Docker network (`n8n-network`) for container communication
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- Persists data to volumes on the host
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- Provides service definition for integration with networking modules
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## Usage
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```hcl
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module "n8n" {
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source = "./modules/20-services-apps/n8n"
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volume_path = "/path/to/volumes/n8n"
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networks = ["homelab-network"]
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}
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```
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## Variables
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| Variable | Description | Type | Default |
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| ------------- | ---------------------------------------------------------- | -------------- | ---------- |
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| `image_tag` | Tag of the n8n image to use | `string` | `"latest"` |
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| `volume_path` | Host path for n8n and Postgres data volumes | `string` | - |
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| `networks` | List of additional networks to which n8n should be attached | `list(string)` | `[]` |
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## Outputs
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| Output | Description |
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| -------------------- | ---------------------------------------------------------- |
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| `service_definition` | Service definition for integration with networking modules |
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## Service Definition
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This module outputs a service definition that is used by the networking modules to expose the service.
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```hcl
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{
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name = "n8n"
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primary_port = 5678
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endpoint = "http://n8n:5678"
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subdomains = ["n8n"]
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publish_via = "tunnel" # Only publish through Cloudflare tunnel
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}
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```
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## Environment Variables
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n8n requires several environment variables to function properly. These are stored in a `.env` file in the module directory and read using the `dotenv` Terraform provider:
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- Database configuration:
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- `POSTGRES_USER`: Root PostgreSQL user
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- `POSTGRES_PASSWORD`: Root PostgreSQL password
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- `POSTGRES_DB`: Database name for n8n
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- `POSTGRES_NON_ROOT_USER`: Non-root user for n8n to connect with
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- `POSTGRES_NON_ROOT_PASSWORD`: Password for the non-root user
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- n8n configuration:
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- `N8N_HOST`: Host for n8n to use
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- `N8N_PORT`: Port for n8n to use
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- `N8N_PROTOCOL`: Protocol for n8n (http or https)
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- `WEBHOOK_URL`: URL for webhooks
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- `NODE_FUNCTION_ALLOW_EXTERNAL`: Whether to allow external function calls
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## Data Persistence
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n8n stores its data in two main volumes:
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1. n8n application data: `/home/node/.n8n` in the container, mapped to `${volume_path}/n8n_storage/_data` on the host
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2. PostgreSQL data: `/var/lib/postgresql/data` in the container, mapped to `${volume_path}/db_storage/_data` on the host
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Additionally, an initialization script is mounted to the PostgreSQL container:
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- `/docker-entrypoint-initdb.d/init-data.sh` in the container, from `${volume_path}/init-data.sh` on the host
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## Networking
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The module creates a dedicated Docker network named `n8n-network` for communication between the n8n and PostgreSQL containers. The n8n container is also attached to any additional networks specified in the `networks` variable, allowing it to communicate with other services in the homelab.
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## Integration with Networking Modules
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This service is configured to be exposed through a Cloudflare tunnel for secure remote access, set by `publish_via = "tunnel"`.
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## Example Integration in Main Configuration
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```hcl
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module "n8n" {
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source = "./modules/20-services-apps/n8n"
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volume_path = module.system_globals.volume_host
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networks = [module.services.homelab_docker_network_name]
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}
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# The service definition is automatically included in the services output
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module "services" {
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source = "./modules/services"
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# ...
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service_definitions = [
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module.n8n.service_definition,
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# Other service definitions
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]
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}
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```
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