Grafana on Docker gives me 404

Hi there!

I launch Grafana using docker with the following configuration:

docker run -d -p 3000:3000 --user grafana --name grafana -e "GF_SECURITY_ADMIN_PASSWORD=EftDYEtw4" -e "GF_SERVER_ROOT_URL=" -v /mnt/vol-db/grafana_data/:/var/lib/grafana grafana/grafana

I get error 404.

the logs:

t=2018-12-19T08:28:59+0000 lvl=info msg="HTTP Server Listen" logger=http.server address= protocol=http subUrl=/grafana socket=
t=2018-12-19T08:30:02+0000 lvl=info msg="Request Completed" logger=context userId=0 orgId=0 uname= method=GET path=/grafana status=404 remote_addr= time_ms=4 size=21199 referer=

I’m using nginx for reverse proxy with:

    location /grafana {

How can Is olve this?