[jira] [Comment Edited] (MESOS-3505) Support specifying Docker image by Image ID.

["Jie Yu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-3505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15180605#comment-15180605 ] 

Jie Yu edited comment on MESOS-3505 at 3/4/16 9:52 PM:
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Can you ask users to make sure 'tag' is unique? That's the simplest work around at this moment.



was (Author: jieyu):
Can you ask uses to make sure 'tag' is unique? That's the simplest work around at this moment.


> Support specifying Docker image by Image ID.
> --------------------------------------------
>
>                 Key: MESOS-3505
>                 URL: https://issues.apache.org/jira/browse/MESOS-3505
>             Project: Mesos
>          Issue Type: Story
>            Reporter: Yan Xu
>              Labels: mesosphere
>
> A common way to specify a Docker image with the docker engine is through {{repo:tag}}, which is convenient and sufficient for most people in most scenarios. However this combination is neither precise nor immutable.
> For this reason, it's possible when an image with a {{repo:tag}} already cached locally on an agent host and a task requiring this {{repo:tag}} arrives, it's using an image that's different than the one the user intended.
> Docker CLI already supports referring to an image by {{repo@id}}, where the ID can have two forms:
> * v1 Image ID
> * digest
> Native Mesos provisioner should support the same for Docker images. IMO it's fine if image discovery by ID is not supported (and thus still requiring {{repo:tag}} to be specified) (looks like [v2 registry|http://docs.docker.com/registry/spec/api/] does support it) but the user can optionally specify an image ID and match it against the cached / newly pulled image. If the ID doesn't match the cached image, the store can re-pull it; if the ID doesn't match the newly pulled image (manifest), the provisioner can fail the request without having the user unknowingly running its task on the wrong image.



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