From the nginx docker page, to run nginx image, we need to:
docker run --name some-nginx -v /some/content:/usr/share/nginx/html:ro -d nginx
I understand the option -v /some/content:/usr/share/nginx/html:ro mounts the directory /some/content on host to container's /usr/share/nginx/html directory.
But what does :ro at the end do ?
It means read only volume. So the container will not be able to modify its contents.