Deploy a Multi-Service Watt Application to Fly.io

In this section, you will deploy a Platformatic Watt application with multiple services to Fly.io. It's important to note that you need to dockerize your Platformatic application before deploying it to Fly.io.

Fly.io Configuration

Before starting, install the Fly CLI and sign up for an account by following Fly.io’s official guide.

Setting Up Fly.io

1. Initialize your Fly.io application: Run the following command from your project root:

  fly launch --no-deploy --generate-name --region lhr --org personal --path .

2. Fly Configuration (fly.toml): The Fly CLI will generate a fly.toml configuration file for your application.

Ensure your fly.toml has the following settings for database volumes and builds:

[build]
  builder = "heroku/buildpacks:20"

[mounts]
  source = "data"
  destination = "/app/.platformatic/data"

3. Database Volume: Create a persistent volume for your database storage:

fly volumes create data --size 3 --region lhr

4. Fly Environment Variables: Ensure your environment variables from your .env file are also present in fly.toml:

[env]
  PORT = 8080
  PLT_SERVER_HOSTNAME = "0.0.0.0"
  PLT_SERVER_LOGGER_LEVEL = "info"
  DATABASE_URL = "sqlite:///app/.platformatic/data/db.sqlite"

It's important to note that your env PORT must match the PORT in your fly.toml file. Navigate to your watt.json file and update the hostname and port to match the following:

"server": {
    "hostname": "0.0.0.0",
    "port": "{PORT}"
  },

Deploying to Fly.io

Now that the configuration is complete, deploy your Platformatic application to Fly.io:

fly deploy

Check out the demo application with multiple services deployed on Fly.io here.