easy-deploy-demo

This is a small demo built for the Build Multi-agent LLM Products course. The goal is to demonstrate simple deployment of a Python web app powered by a Large Language Model.

The app uses these major components:

• Chainlit for a chat-style UI built in Python
• OpenAI library for LLM chat completions
• Autogen multi-agent app framework
• Fly.io for deployment

While this demo isn't meant to be an endorsement of any particular product or tech, we have found this particular stack quite convenient for quick and easy deploys of chat-style LLM apps.

Pre-requisites

• Python >= 3.8
• pip
• An OpenAI Account and API key
• A Fly.io account

Step 0: Select an app

There are two demo apps in this repository:

• chainlit-chat: a simple Q&A-style chatbot
• chainlit-autogen: a dialog between two agents, implented with PyAutogen

The steps below are for chainlit-chat. To run the other app just substitute the app name chainlit-autogen. The steps are otherwise the same.

Step 1: Install

Begin by cloning this git repo. git clone https://github.com/Aggregate-Intellect/easy-deploy-demo

Then, in a terminal within the repository root directory, ...

cd chainlit-chat 

python -m venv .venv 

source .venv/bin/activate

pip install --upgrade pip

pip install -r requirements.txt

chainlit hello

You should see a test Chainlit app running.

If you got stuck anywhere up to here, see the Chainlit installation docs for help.

Step 2: Run the app locally

Since our app will connect to the OpenAI platform we need to copy the value of our API key into a file called .env in the app directory.

Copy the sample .env file...

cp sample.env .env

... and then edit .env to contain your key.

Once you have done this you can run the demo app:

chainlit run app.py -w

The -w flag makes Chainlit reload after each file change. Any changes you make to app.py will be reflected immediately in your web browser. This is useful for iterative development, and not used in production.

Step 3: Prepare to deploy to fly.io

brew install flyctl

fly auth signup

fly auth login

fly launch

You can accept the fly launch defaults or tweak them as you see fit.

You might need to select a unique application name, if your app name conflicts with one that already exists.

Before deploying the app, go to your Fly dashboard and add an app secret called OPENAI_API_KEY to your newly created app. Enter the value of your API key.

Step 4: Deploy to fly.io

fly deploy

At this point Fly remotely builds a docker file for you based on the Dockerfile, and deploys the app. This can take a few minutes on the very first deploy. Subsequent deploys are much faster, especially if you're just editing a few lines of code in the application file.

After deploy finishes you should have the demo app running at a URL on the fly.dev domain. Enjoy!

Warning

At this point your app is deployed on the internet, unprotected. Anyone can use it unless you block it with authentication. You may incur costs as your OpenAI API key is tied to your credit card.

You can now make changes to files on your local machine, save the changes, run locally (use the -w flag to get automatic reload), and redeploy using fly deploy. For example, try changing the prompt in app.py to give the LLM different instructions.

Using a Dockerfile for your deployment gives you the option of running your Docker image in many places, including other development laptops and cloud deployment environments that run Docker containers.

As an alternative to the Docker-based build you can just provide the pip requirements.txt file. Fly will generate a Dockerfile for you from the contents of requirements.txt. In our experience the deploy takes longer when done this way.

Demo notes

1. Since these apps use sockets (a Chainlit requirement), and we don't have a load balancer in front of the apps, we want only a single fly.io machine to be running in each fly.io deployment region. You can do this with the command fly scale count 1 .

2. When you are done playing with the demo on fly.io, put your app to sleep with fly scale count 0 or delete the app entirely from the dashboard. This will prevent other people from using the app and potentially racking up OpenAI usage charges. (In a production situation your app will automatically scale down to zero after a period of inactivity, but it will wake up again upon the next HTTP request.)

3. The Autogen demo involves a dialog between two agents working together to plot a stock chart. The chart produced by the demo ends up in the /public directory of the app. The demo agents tell you the name of the file they produce. You can view this chart, e.g. if the agents tell you the filename is stock_price_ytd.png you can append /public/stock_price_ytd.png to your app URL and you should see the chart.

4. The Autogen demo requires some Python libraries to be installed, and the agents actually do this installation for you, provided you click "continue" to allow them to do the install. This is impressive, but obviously something you should never permit in a production environment.

Useful fly.io commands

Tail logs: fly logs

Restart the app: fly apps restart

Scale machine instances to 0: fly scale machine count 0

Scale machine instances to 1: fly scale count 1

SSH to console: fly ssh console

Credits

SVG icons are from the Chainlit Cookbook.

Future Improvements

• authentication and authorization
• instrumenting the app to provide observability