Based on my phantomjs container.
Because phantomjs runs inside the container, you need to bind mount a volume to retrieve the screenshot.
The container is configured to write screenshots to
/srv, so bind-mounting
$PWD (or whatever directory you want to screenshot created in) to it seems like a good idea.
$ docker run ubermuda/screenshot Usage: rasterize.js URL filename [paperwidth*paperheight|paperformat] [zoom] paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "A4", "Letter" image (png/jpg output) examples: "1920px" entire page, window width 1920px "800px*600px" window, clipped to 800x600 $ docker run -v $PWD:/srv ubermuda/screenshot http://www.google.com/ google.com.png 1920px