Sure, I can help you with setting up a Docker reverse proxy with Nginx. Here's a step-by-step guide:

Step 1: Install Docker and Docker Compose
Make sure you have Docker and Docker Compose installed on your system. You can follow the official documentation for installation instructions.

Step 2: Create a new directory
Create a new directory where you will store your Nginx configuration files. For example, create a directory called "nginx-proxy" in your home directory.

Step 3: Create the Nginx configuration file
Inside the "nginx-proxy" directory, create a file called "default.conf" and open it in a text editor. This file will contain the reverse proxy configuration.

Here's an example of a basic Nginx reverse proxy configuration:

```
server {
    listen 80;
    server_name yourdomain.com;

    location / {
        proxy_pass http://your-app-container:port;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}
```

Replace "yourdomain.com" with your actual domain name or IP address. Replace "your-app-container" with the name of your Docker container running the application you want to proxy. Replace "port" with the port number on which your application is running inside the container.

Save and close the file.

Step 4: Create a Docker Compose file
Inside the "nginx-proxy" directory, create another file called "docker-compose.yml" and open it in a text editor. This file will define the services required for running Nginx as a reverse proxy.

Here's an example of a basic Docker Compose configuration:

```
version: '3'
services:
  nginx:
    image: nginx
    ports:
      - 80:80
    volumes:
      - ./default.conf:/etc/nginx/conf.d/default.conf
    restart: always
```

Save and close the file.

Step 5: Start the Docker containers
Open a terminal or command prompt, navigate to the "nginx-proxy" directory, and run the following command to start the Docker containers:

```
docker-compose up -d
```

This will start the Nginx
container as a reverse proxy using the configuration specified in the "default.conf" file.

Step 6: Test the reverse proxy
Assuming your DNS or hosts file is properly configured, you should now be able to access your application through the reverse proxy. Open a web browser and enter your domain name or IP address. The request will be forwarded to your application running inside the Docker container.

That's it! You have successfully set up a Docker reverse proxy with Nginx. You can add more server blocks in the "default.conf" file to configure additional reverse proxies for different applications if needed