---
title: Multiple Fly Applications
layout: framework_docs
objective: At some point a Rails application will need to run additional services, like a Puppeteer server that takes screenshots of a webpage for your Rails application. Learn how to manage multiple applications from one Rails project to keep your monolith a monolith.
---
This guide discusses how to manage multiple Fly applications within a Rails projects. This is useful for Rails projects that need to run other services, like running a pool of Puppeteer servers that your Rails app calls to take screenshots of web pages.
## What is a Fly application?
Your Rails application is a Fly application, which means it has the following few things:
* A `fly.toml` file in the root directory
* A `Dockerfile` in the root directory that describes the image
* A "server" running on Fly's infrastructure.
So how do you spin up multiple Fly applications for a single Rails project?
## Creating a Fly application within a Fly application
The important thing about creating multiple Fly applications within a project is keeping them organized. For our example, we'll setup a Redis server application and keep it in the `./fly/applications` folder within our project repo.
Let's get started by running the following commands:
```cmd
mkdir -p fly/applications/redis
cd fly/applications/redis
```
From inside the `fly/applications/redis` folder, run:
```cmd
fly launch --image flyio/redis:6.2.6 --no-deploy --name my-project-name-redis
```
This command will create a `Dockerfile` and `fly.toml` file that can be further configured for your application's needs.
Next, deploy the application:
```cmd
fly deploy
```
## Accessing from the root application
Fly creates DNS hosts for each of your applications that are not surprising.
## Deploying updates
In the future, when it's time to deploy updates to your Fly application within a Fly application, run:
```cmd
cd fly/application/redis
fly deploy
```
That's it.
Multiple Fly Applications
This guide discusses how to manage multiple Fly applications within a Rails projects. This is useful for Rails projects that need to run other services, like running a pool of Puppeteer servers that your Rails app calls to take screenshots of web pages.
What is a Fly application?
Your Rails application is a Fly application, which means it has the following few things:
A fly.toml file in the root directory
A Dockerfile in the root directory that describes the image
A “server” running on Fly’s infrastructure.
So how do you spin up multiple Fly applications for a single Rails project?
Creating a Fly application within a Fly application
The important thing about creating multiple Fly applications within a project is keeping them organized. For our example, we’ll setup a Redis server application and keep it in the ./fly/applications folder within our project repo.
Let’s get started by running the following commands:
mkdir -p fly/applications/redis
cd fly/applications/redis
From inside the fly/applications/redis folder, run: