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From "Jay Guo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MESOS-3505) Support specifying Docker image by Image ID.
Date Tue, 11 Oct 2016 10:24:20 GMT

    [ https://issues.apache.org/jira/browse/MESOS-3505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15565098#comment-15565098
] 

Jay Guo commented on MESOS-3505:
--------------------------------

alright, I unassigned myself. Please go ahead. If you need some help reviewing the patch,
glad to help.

> 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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