I actually found the cause. We should use dockerctl instead of plain docker commands because of upstream bug https://github.com/docker/docker/issues/4036 . It is fixed in Docker 1.7, but we will not be updating docker in Fuel versions below 8.0. My patch https://review.openstack.org/#/c/240826/ contains a workaround that should solve this.
I actually found the cause. We should use dockerctl instead of plain docker commands because of upstream bug https:/ /github. com/docker/ docker/ issues/ 4036 . It is fixed in Docker 1.7, but we will not be updating docker in Fuel versions below 8.0. My patch https:/ /review. openstack. org/#/c/ 240826/ contains a workaround that should solve this.