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As described inline, we should lower the MTU in the docker configuration when we see the interface has a MTU lower than 1500 so things "just work". This particularly affects the Linaro ARM64 cloud in OpenDev, but it is a generic issue. Change-Id: I338616c41a65b007d56648fdab6da2a6a6b909f4 Story: https://storyboard.openstack.org/#!/story/2008230
An ansible role to install docker and configure it to use mirrors if available.
Role Variables
URL to override the generated docker hub mirror url based on :zuul
ensure-docker.mirror_fqdn
.