I download the image through the docker pull nginx:1.10 command and then run it. Where is nginx’s configuration file?

  docker, question

I download the image through the docker pull nginx:1.10 command and then run it. Where is nginx’s configuration file?
(1) Download image, docker pull nginx:1.10
(2) start the container, docker run -d -p 8080:80 nginx:1.10

The container is in/etc/nginx/nginx.conf

Can be mounted by

docker run -d -p 8080:80 -v /data/nginx.conf:/etc/nginx/nginx.conf nginx:1.10