'[[0;1;31mFAILED[0m] Failed to start' when running cloud-init?

Question

I am trying to contextualize a docker container using cloud-init.
Why do I see [[0;1;31mFAILED[0m] Failed to start in the OpenStack log?
What is a likely cause of this error?

Answer 1

From my rather limited experience, a likely reason is that the command sudo docker image build does not find the docker file.
(But a virtual machine may have been successfully created.)