github.com/45cali/docker@v1.11.1/docs/breaking_changes.md (about)

     1  <!--[metadata]>
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     3  aliases = ["/engine/misc/breaking/"]
     4  title = "Breaking changes"
     5  description = "Breaking changes"
     6  keywords = ["docker, documentation, about, technology, breaking",
     7  "incompatibilities"]
     8  [menu.main]
     9  parent = "engine_use"
    10  weight=80
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    12  <![end-metadata]-->
    13  
    14  # Breaking changes and incompatibilities
    15  
    16  Every Engine release strives to be backward compatible with its predecessors.
    17  In all cases, the policy is that feature removal is communicated two releases
    18  in advance and documented as part of the [deprecated features](deprecated.md)
    19  page.
    20  
    21  Unfortunately, Docker is a fast moving project, and newly introduced features
    22  may sometime introduce breaking changes and/or incompatibilities. This page
    23  documents these by Engine version.
    24  
    25  # Engine 1.10
    26  
    27  There were two breaking changes in the 1.10 release.
    28  
    29  ## Registry
    30  
    31  Registry 2.3 includes improvements to the image manifest that have caused a
    32  breaking change. Images pushed by Engine 1.10 to a Registry 2.3 cannot be
    33  pulled by digest by older Engine versions. A `docker pull` that encounters this
    34  situation returns the following error:
    35  
    36  ```
    37   Error response from daemon: unsupported schema version 2 for tag TAGNAME
    38  ```
    39  
    40  Docker Content Trust heavily relies on pull by digest. As a result, images
    41  pushed from the Engine 1.10 CLI to a 2.3 Registry cannot be pulled by older
    42  Engine CLIs (< 1.10) with Docker Content Trust enabled.
    43  
    44  If you are using an older Registry version (< 2.3), this problem does not occur
    45  with any version of the Engine CLI; push, pull, with and without content trust
    46  work as you would expect.
    47  
    48  ## Docker Content Trust
    49  
    50  Engine older than the current 1.10 cannot pull images from repositories that
    51  have enabled key delegation. Key delegation is a feature which requires a
    52  manual action to enable.