One possible way to configure Nginx inside a Docker container to display a simple homepage that says 'Hello John' is:

- Create a Dockerfile that uses the official Nginx image as the base image.
- In the Dockerfile, copy a custom index.html file to the /usr/share/nginx/html directory. This file should contain the text 'Hello John'.
- Build the Docker image using the docker build command.
- Run the Docker container using the docker run command with the -p option to map a port on the host to port 80 on the container.
- Access the homepage using a web browser and the host port.

Here is an example of a Dockerfile and an index.html file:

```markdown
# Dockerfile
FROM nginx
COPY index.html /usr/share/nginx/html

# index.html
<html>
<head>
<title>Hello John</title>
</head>
<body>
<h1>Hello John</h1>
</body>
</html>
```

Here is an example of how to build and run the Docker image:

```markdown
# Build the image with the tag hello-john
docker build -t hello-john .

# Run the container and map port 8080 on the host to port 80 on the container
docker run -p 8080:80 -d hello-john

# Access the homepage using http://localhost:8080
```
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