This library is a lightweight, fully typed Node wrapper for the Fly CLI tool for programmatic deployments to Fly.io.

It has only one dependency, Zod, for validating the responses from the Fly API.

It's built with a configuration-first approach, meaning that you provide a fly.toml file and an API token, and let the library handle the necessary boilerplate stuff.

[!NOTE] The library aims to be unopinionated and follow the flyctl commands structure as much as possible.

There are tons of CLI commands that could be supported, but since blueprint deployments are the primary use case, this is where the focus lies.

For now the library is built for the needs at Codeware Sthlm, but it aims to be flexible and work for any Fly.io app.

Contents

• Installation
• Usage
  • Authentication
  • Create a Fly instance
    • Verify that the Fly client is ready
  • Deploying apps & machines
    • Create an application
    • Destroy an application
    • Deploy an application
    • Application status
    • List applications
  • Configuration & scaling
    • Add a custom domain
    • Remove a custom domain
    • List certificates
    • Save application configuration
    • Show application configuration
    • Add application secrets
    • Remove application secrets
    • List secrets

Installation

npm install @cdwr/fly-node

Fly CLI Requirements

[!IMPORTANT] This library requires the Fly CLI (flyctl) to be installed and accessible in your PATH.

Version used in test: v0.4.0

Installation Instructions:

• macOS: brew install flyctl
• Linux/WSL: curl -L https://fly.io/install.sh | sh
• Windows: pwsh -Command "iwr https://fly.io/install.ps1 -useb | iex"
• Manual Installation: See official docs

Verify Installation:

flyctl version

Usage

The library behaves just like the Fly CLI tool regarding all default values.

For any command you run, your local flyctl installation will be verified. If it's not present, the command will abort with exception.

[!TIP] Instead of flyctl you can also use fly if preferred.

Authentication

Supported authentication methods to Fly.io in order:

1. authenticate locally via flyctl auth login
2. provide a token when creating the Fly instance
3. set access token environment variable FLY_ACCESS_TOKEN
4. set API token environment variable FLY_API_TOKEN

[!NOTE] See Fly Docs about security tokens for more details.

Flaky --access-token flag

From version 0.3.210 the access token flag has a regression, reported in https://github.com/superfly/flyctl/issues/4648.

[!IMPORTANT] To avoid pinning a previous version, this library no longer relies on the --access-token flag. When a token is provided to the Fly instance, the library will set FLY_ACCESS_TOKEN internally.

This legitimate workaround might change depending on how the Fly team responds to the issue. The intention is to handle this internally without affecting the library api.

Create a Fly instance

import { Fly } from '@cdwr/fly-node';

const fly = new Fly();

// Provide a Fly token
const fly = new Fly({ token: 'my-fly-token' });

[!TIP] Built-in monorepo support!

When you run flyctl in your terminal, it will look for a fly.toml file in your current working directory. If that's not the case, you have to provide the app or config option for any command to run.

This is what you have in a monorepo setup, where you probably have the fly.toml configuration files in the applications folders.

The library Fly class works the same way at its default configuration. However, you can also provide the app or config options when creating the instance to let the commands know where to run.

So, to create an instance to my-app, you can do it like this:

const fly = new Fly({ config: 'apps/my-app/fly.toml' });

Any command run on this instance will then be executed on my-app.

Similarly when you have an application named your-app on Fly.io, you can create an instance to it like this:

const fly = new Fly({ app: 'your-app' });

Any command run on this instance will instead be executed on your-app.

One more thing. The commands supported by this library and have app or config flags, will override the instance application when provided. This gives you the default flyctl CLI behaviour but with improved flexibility depending on your repository structure.

Options

| Name | Description | | ----------------- | ------------------------------------------------------------------------------------------------------------------------------- | | token | Fly access token, when none of FLY_ACCESS_TOKEN or FLY_API_TOKEN is provided. | | app or config | Name of the application or the path to the fly configuration file to run all commands on. | | org | Target organisation for your created apps. Defaults to your personal organisation. | | region | Target region for your deployed apps. Defaults to auto-detect the fastest location. | | logger | Custom logger for the library. Defaults to using console.log() and console.error(). CLI tracing can be enabled when needed. |

Verify that the Fly client is ready

As described in the installation section, the library will verify that the Fly client is ready for any command you run.

However, you can also verify that the Fly client is ready manually, without running any commands.

const isReady = await fly.isReady(); // true or false

// Or use assertion mode
const isReady = await fly.isReady('assert'); // throws error if false

For both modes a message will be logged to console when the Fly client is ready.

Use this command to check if the Fly CLI is installed.

const isInstalled = await fly.cli.isInstalled(); // true or false

This command gets the installed Fly CLI version.

const { version } = await fly.cli.version();

Deploying apps & machines

Create an application

This will create an application which is not deployed yet. You can add secrets, domains etc. and deploy later when ready.

[!TIP] Creating an application is not necessary before deploying, the library will do it for you.

await fly.apps.create(); // name: 'some-app-name-123'

// Create application 'foo-app' in the instance organisation
await fly.apps.create({ app: 'foo-app' });

// Create application 'bar-app' in organisation 'baz'
await fly.apps.create({ app: 'bar-app', org: 'baz' });

Destroy an application

This will destroy the application completely.

[!NOTE] When the application is attached to one or many Postgres clusters, it will be detached from all before it gets destroyed

await fly.apps.destroy('foo-app');

Deploy an application

[!IMPORTANT] Currently there's a small limitation to detecting which configuration to use for deployment. To make sure the correct configuration is used you must provide the configuration file, either globally via instance or in the command options.

Without providing the configuration file, the command will throw an error.

// deploy the instance application, if provided
const response = await fly.deploy();

// deploy 'foo-app'
const response = await fly.deploy({ config: 'apps/foo-app/fly.toml' });

// deploy 'bar-app' configuration as 'preview-bar-app'
const response = await fly.deploy({
  app: 'preview-bar-app',
  config: 'apps/bar-app/fly.toml'
});

// deploy 'bar-app' and attach postgres cluster 'db-app'
const response = await fly.deploy({
  config: 'apps/bar-app/fly.toml',
  postgres: 'db-app'
});

// Opt out of the default depot builder
const response = await fly.deploy({
  app: 'pr-19-foo-app',
  config: 'apps/foo-app/fly.toml',
  optOutDepotBuilder: true
});

// Use remote config for existing apps (useful to prevent overriding ad-hoc configurations)
const response = await fly.deploy({
  app: 'tenant-foo-app',
  config: 'apps/foo-app/fly.toml',
  preferRemoteConfig: true
});
// For existing apps: saves remote config to fly.{appName}.toml and uses it
// For new apps: uses the local config file

// With options that could be a pull request preview deployment
const response = await fly.deploy({
  app: 'pr-19-foo-app',
  config: 'apps/foo-app/fly.toml',
  environment: 'preview',
  org: 'baz',
  postgres: 'db-preview',
  region: 'arn',
  env: {
    DEPLOY_ID: 'qwerty'
  },
  secrets: {
    LICENCE_KEY: '1234567890'
  }
});

// {
//   app: 'pr-19-foo-app',
//   hostname: 'pr-19-foo-app.fly.dev',
//   url: 'https://pr-19-foo-app.fly.dev'
// }

[!TIP] When the application is attached to a Postgres cluster, Fly will provide the secret DATABASE_URL to the application.

Read more about attach or detach a Fly app.

Application status

// Get the status of the instance application
const status = await fly.status();

// Get the status of 'foo-app'
const status = await fly.status({ app: 'foo-app' });
const status = await fly.status({ config: 'apps/foo-app/fly.toml' });

// {
//   name: 'foo-app',
//   hostname: 'foo-app.fly.dev',
//   url: 'https://foo-app.fly.dev',
//   organization: {
//     name: 'personal'
//   },
//   status: 'running',
//   ... more
// }

// Get the status of an application that doesn't exist
const status = await fly.status({ app: 'non-existent-app' }); // null

// There is also an extended status command with more details
const status = await fly.statusExtended();

// {
//   ... same as above
//   domains: [
//     'foo.domain.com'
//   ],
//   secrets: [
//     'FOO',
//     'BAR'
//   ],
//   ... more
// }

List applications

// Get all applications
const apps = await fly.apps.list();

Configuration & scaling

Add a custom domain

Adding a domain will create a certificate for it with automatic renewal.

[!TIP] Read the guide about how to add a custom domain for your app.

// Add a Domain to the instance application
await fly.certs.add('foo.domain.com');

// Add a domain to 'bar-app'
await fly.certs.add('bar.domain.com', { app: 'bar-app' });
await fly.certs.add('baz.domain.com', { config: 'apps/bar-app/fly.toml' });

Remove a custom domain

// Remove a domain from the instance application
await fly.certs.remove('foo.domain.com');

// Remove a domain from 'bar-app'
await fly.certs.remove('bar.domain.com', { app: 'bar-app' });
await fly.certs.remove('baz.domain.com', { config: 'apps/bar-app/fly.toml' });

List certificates

// List certificates for the instance application
const certs = await fly.certs.list();

// List certificates for 'foo-app'
const certs = await fly.certs.list({ app: 'foo-app' });
const certs = await fly.certs.list({ config: 'apps/foo-app/fly.toml' });

// [
//   {
//     clientStatus: 'Ready',
//     createdAt: '2024-01-01T00:00:00.000Z',
//     hostname: 'foo.domain.com',
//   },
//   ...
// ]

// List certificates for all your applications
const certs = await fly.certs.list('all');

// [
//   {
//     app: 'foo-app',
//     [cert details]
//   },
//   ...
//   {
//     app: 'bar-app',
//     [cert details]
//   },
//   ...
// ]

Save application configuration

Save an application's remote configuration from Fly.io to a local TOML file. This is useful for backing up configurations or using remote configs for existing apps in deployments.

// Save 'foo-app' remote config to local file
await fly.config.save({
  app: 'foo-app',
  config: 'apps/foo-app/fly.remote.toml'
});

Show application configuration

The configuration is always fetched from Fly.io remote configuration, but you can also fetch the local configuration file.

When a configuration cannot be shown, the command will throw an error.

[!TIP] Fetching local configuration is the only option for applications never deployed. It will also assure that the file exists.

// Show the instance application configuration
const config = await fly.config.show();

// Show 'foo-app' configuration
const config = await fly.config.show({ app: 'foo-app' });
const config = await fly.config.show({ config: 'apps/foo-app/fly.toml' });

// Show local 'new-app' configuration
const config = await fly.config.show({
  config: 'apps/new-app/fly.toml',
  local: true
});

Add application secrets

Adding secrets to an application will trigger a deployment for machines running the application.

// Add secrets to the instance application
await fly.secrets.set({
  LICENCE_KEY: '1234567890',
  SOME_SECRET: 'super-secret'
});

// Add secrets to 'foo-app'
await fly.secrets.set({ FOO: 'bar' }, { app: 'foo-app' });
await fly.secrets.set({ BEE: 'baz' }, { config: 'apps/foo-app/fly.toml' });

// Add secrets to 'foo-app' and skip auto-deploy
await fly.secrets.set({ FOO: 'bar' }, { app: 'foo-app', stage: true });

Remove application secrets

// Remove secret from the instance application
await fly.secrets.unset('FOO');

// Remove secret from 'foo-app'
await fly.secrets.unset('FOO', { app: 'foo-app' });
await fly.secrets.unset('BEE', { config: 'apps/foo-app/fly.toml' });

// Remove secret from 'foo-app' and skip auto-deploy
await fly.secrets.unset('FOO', { app: 'foo-app', stage: true });

List secrets

// List secrets for the instance application
const secrets = await fly.secrets.list();

// List secrets for 'foo-app'
const secrets = await fly.secrets.list({ app: 'foo-app' });
const secrets = await fly.secrets.list({ config: 'apps/foo-app/fly.toml' });