How to deploy streamlit app from droplet

Heya @ferdinandmosca,

You should be able to deploy this using PM2 so that you don’t have to constantly type in streamlit run myapp.py.

Additionally, in order to setup a domain and run it on https, I’ll recommend using Nginx as a reverse proxy.

1. Set Up PM2 to Manage Your Streamlit App

PM2 is a process manager for Node.js applications, but it can also be used to manage other types of applications, including Python apps like Streamlit.

1. Install PM2: If you haven’t already installed PM2, you can do so via NPM (Node Package Manager). First, install Node.js and NPM, then install PM2:

sudo apt update
sudo apt install nodejs npm
sudo npm install pm2@latest -g

2. Run Streamlit with PM2: Start your Streamlit app using PM2. This will keep your app running in the background:

pm2 start 'streamlit run myapp.py' --name my-streamlit-app

The --name flag is optional but helps identify the process.

3. Set PM2 to Start on Boot: To ensure PM2 and your app start automatically on system reboot:

pm2 startup
pm2 save

2. Configure Nginx as a Reverse Proxy

Nginx can be used to reverse proxy your Streamlit app, making it accessible via a standard web port (like 80 for HTTP).

1. Install Nginx: If Nginx is not installed, you can install it using:

sudo apt update
sudo apt install nginx

2. Configure Nginx: Create a new Nginx server block configuration or edit the default one:

sudo nano /etc/nginx/sites-available/default

Add the following inside the server block:

location / {
    proxy_pass http://localhost:8501; # Ensure this is the port Streamlit runs on
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $host;
}

3. Restart Nginx: To apply the changes, restart Nginx:

systemctl restart nginx

3. Domain and HTTPS

1. Setup Domain:

   • Point your domain to your Droplet’s IP address using your domain provider’s DNS settings.
   • Update the Nginx configuration to include your domain in the server_name directive.

2. Enable HTTPS with Let’s Encrypt:

   • Install Certbot and the Nginx plugin:

sudo apt install certbot python3-certbot-nginx

• Obtain the certificate

sudo certbot --nginx -d yourdomain.com -d www.yourdomain.com

• Certbot will modify your Nginx configuration to use HTTPS and set up automatic certificate renewal.

Final Steps

• Verify everything is working as expected. Your Streamlit app should now be accessible through your domain with HTTPS enabled.
• Remember to open the necessary ports (like 80 and 443) in your firewall settings.

This setup should ensure your Streamlit app is running continuously without manual intervention, accessible through a domain name, and secured with HTTPS.