Problem with graphite datasource

[giampaolotrapasso]

To best of my knowledge, logging into grafana should allow be to add carbon/graphite as datasource. I've tried to put localhost as $(docker-machine ip) in the URL section of new Datasource but I have only the "Failed to add datasource" message.

What am I doing wrong? What can I check to provide further details for this problem?

[heyman]

I'm using http://localhost:80 which really shouldn't matter, but maybe worth trying? However I'm using an older version (Grafana 2.0.1, cc144b0) of this image.