error docker: invalid reference format. when execute docker run

Question

Complete command is

docker run --name mynginx2 -v /var/www:/usr/share/nginx/html:ro \\ -v /var/nginx/conf:/etc/nginx:ro -P -d nginx

Why its not working?

I found it here https://blog.docker.com/2015/04/tips-for-deploying-nginx-official-image-with-docker/

Thanks

Answer 1

\\ is breaking up the command

Run the whole thing without the '\\'

docker run --name mynginx2 -v /var/www:/usr/share/nginx/html:ro -v /var/nginx /conf:/etc/nginx:ro -P -d nginx