How to let docker runner not pull images from web

[always-waiting]

I have these warnings

Running with gitlab-ci-multi-runner 1.6.1 (c52ad4f)
Using Docker executor with image ubuntu16.04.python:packages ...
Pulling docker image ubuntu16.04.python:packages ...
WARNING: Cannot pull the latest version of image ubuntu16.04.python:packages : Error: image library/ubuntu16.04.python not found
WARNING: Locally found image will be used instead.

how to let runner not to pull images from web first, instead of find in local first?

[Maescool]

As far as i know, this runner doesn't, I recommend setting up a local docker registry if you want to have images privately processed with your runner.