[improvement][doc] Should add note about docker image repository name

[udomsak]

Driver docker

for docker repository that not use default or private repo ( hub.docker.com ) they must include authentication otherwise nomad can't start job because they can't find an image. and then report an error
with

API error (404): {"message":"repository myrepo/myimage not found: does not exist or no pull access"}

This can occur even if you have an image on local Nomad still can't find your image. ( not sure this is bug or not :) )

[dadgar]

@udomsak Hey thanks for using Nomad and sorry you ran into something confusing. Unfortunately I don't quite follow what you are asking to be improved. Could you maybe link to where was confusing in the docs?

[udomsak]

@dadgar below is my suggestion ( i not well in English ), However may be bug ?

image - The Docker image to run. The image may include a tag or custom URL and should include https:// if required. By default it will be fetched from Docker Hub. You need to add authentication if you not use Docker hub. Otherwise Nomad can't see your image < - This section my be need to add ( See Authentication )

NOTE If you build image on local and they not store on any remote repository ( Docker hub , etc. ) Nomad can't see your image. <- Add this too.

config {
image = "https://hub.docker.internal/redis:3.2"
}

or may be

FAQ.

• When i use docker driver and then run job i found an Error API error (404): {"message":"repository myrepo/myimage not found: does not exist or no pull access"} what happen ?

Ans: Add Authentication in Nomad job if you not use Docker hub.

[dadgar]

Fixed by: 71462bf

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