The docker login command is removing the ability to automatically register for an account with the target registry if the given username doesn't exist. Due to this change, the email flag is no longer required, and will be deprecated.
The flag `--security-opt` doesn't use the colon separator(`:`) anymore to divide keys and values, it uses the equal symbol(`=`) for consinstency with other similar flags, like `--storage-opt`.
To make tagging consistent across the various `docker` commands, the `-f` flag on the `docker tag` command is deprecated. It is not longer necessary to specify `-f` to move a tag from one image to another. Nor will `docker` generate an error if the `-f` flag is missing and the specified tag is already in use.
The flags `-d` and `--daemon` are deprecated in favor of the `daemon` subcommand:
docker daemon -H ...
The following single-dash (`-opt`) variant of certain command line options
are deprecated and replaced with double-dash options (`--opt`):
docker attach -nostdin
docker attach -sig-proxy
docker build -no-cache
docker build -rm
docker commit -author
docker commit -run
docker events -since
docker history -notrunc
docker images -notrunc
docker inspect -format
docker ps -beforeId
docker ps -notrunc
docker ps -sinceId
docker rm -link
docker run -cidfile
docker run -dns
docker run -entrypoint
docker run -expose
docker run -link
docker run -lxc-conf
docker run -n
docker run -privileged
docker run -volumes-from
docker search -notrunc
docker search -stars
docker search -t
docker search -trusted
docker tag -force
The following double-dash options are deprecated and have no replacement:
docker run --cpuset
docker run --networking
docker ps --since-id
docker ps --before-id
docker search --trusted
### Interacting with V1 registries
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.
### Docker Content Trust ENV passphrase variables name change
Since 1.9, Docker Content Trust Offline key has been renamed to Root key and the Tagging key has been renamed to Repository key. Due to this renaming, we're also changing the corresponding environment variables
