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Update deprecation notes about v1 registry

Adds section about the hub deprecating the v1 protocol.
Adds note about intent to disable by default and remove support.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
(cherry picked from commit c8f826f4077b15af30d8810f62abd517908bb712)
Signed-off-by: Victor Vieux <victorvieux@gmail.com>

Derek McGowan authored on 2016/11/22 02:39:48
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@@ -242,7 +242,18 @@ of the `--changes` flag that allows to pass `Dockerfile` commands.
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 ### Interacting with V1 registries
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-Version 1.9 adds a flag (`--disable-legacy-registry=false`) which prevents the docker daemon from `pull`, `push`, and `login` operations against v1 registries.  Though disabled by default, this signals the intent to deprecate the v1 protocol.
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+**Disabled By Default In Release: v1.14**
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+
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+**Target For Removal In Release: v1.17**
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+
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+Version 1.9 adds a flag (`--disable-legacy-registry=false`) which prevents the
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+docker daemon from `pull`, `push`, and `login` operations against v1
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+registries.  Though enabled by default, this signals the intent to deprecate
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+the v1 protocol.
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+
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+Support for the v1 protocol to the public registry was removed in 1.13. Any
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+mirror configurations using v1 should be updated to use a
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+[v2 registry mirror](https://docs.docker.com/registry/recipes/mirror/).
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 ### Docker Content Trust ENV passphrase variables name change
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 **Deprecated In Release: [v1.9.0](https://github.com/docker/docker/releases/tag/v1.9.0)**