Starting on June 1, 2017, Triton will no longer support the use of the Docker Registry v1 API. The v1 protocol has been officially deprecated by Docker as of version 1.13 (please see this for more information).
Container images using the v1 registry format will need to be converted to the v2 format before you pull them into Triton for use. Please consult the provider of your Docker registry for instructions on migrating your Docker images to the new v2 format.
If you are a Joyent customer and have any further questions regarding this change, please do not hesitate to submit a request via http://help.joyent.com or by email to email@example.com.
Your attention to this is much appreciated.