Builder
New HEALTHCHECK Dockerfile instruction to support user-defined healthchecks #23218
New SHELL Dockerfile instruction to specify the default shell when using the shell form for commands in a Dockerfile #22489
Add #escape= Dockerfile directive to support platform-specific parsing of file paths in Dockerfile#22268
Add support for comments in .dockerignore #23111
Support for UTF-8 in Dockerfiles #23372
Skip UTF-8 BOM bytes from Dockerfile and .dockerignore if exist #23234
Contrib
Remove MountFlags in systemd unit to allow shared mount propagation #22806
Distribution
Add --max-concurrent-downloads and --max-concurrent-uploads daemon flags useful for situations where network connections don't support multiple downloads/uploads #22445
Registry operations now honor the ALL_PROXY environment variable #22316
Provide more information to the user on docker load #23377
Logging
Syslog logging driver now supports DGRAM sockets #21613
Add --details option to docker logs to also display log tags #21889
Inherit the daemon log options when creating containers #21153
Remove docker/ prefix from log messages tag and replace it with {{.DaemonName}} so that users have the option of changing the prefix #22384
Networking
Add driver filter to network ls #22319
Adding network filter to docker ps --filter #23300
Fix DNS issue when renaming containers with generated names #22716
Allow both network inspect -f {{.Id}} and network inspect -f {{.ID}} to address inconsistency with inspect output #23226
Add --link-local-ip flag to create, run and network connect to specify a container's link-local address #23415
Plugins (experimental)
New plugin command to manager plugins with install, enable, disable, rm, inspect,set subcommands #23446
Remote API (v1.24)
Add before and since filters to docker images --filter #22908
Add --limit option to docker search #23107
Add --filter option to docker search #22369
API now returns a JSON object when an error occurs making it more consistent #22880
Prevent docker run -i --restart from hanging on exit #22777
Runtime
Add --live-restore daemon flag to keep containers running when daemon shuts down, and regain control on startup #23213
Ability to add OCI-compatible runtimes (via --add-runtime daemon flag) and select one with --runtime on create and run #22983
New overlay2 graphdriver for Linux 4.0+ with multiple lower directory support #22126
New load/save image events #22137
Add support for reloading daemon configuration through systemd #22446
Add disk quota support for btrfs #19651
Add disk quota support for zfs #21946
Add support for docker run --pid=container:
Align default seccomp profile with selected capabilities #22554
Add a daemon reload event when the daemon reloads its configuration #22590
Add trace capability in the pprof profiler to show execution traces in binary form #22715
Add a detach event #22898
Undeprecate the -c short alias of --cpu-shares on run, build, create, update #22621
Prevent from using aufs and overlay graphdrivers on an eCryptfs mount #23121
Fix issues with tmpfs mount ordering #22329
Created containers are no longer listed on docker ps -a -f exited=0 #21947
Fix an issue where containers are stuck in a "Removal In Progress" state #22423
Fix bug that was returning an HTTP 500 instead of a 400 when not specifying a command on run/create #22762
Fix bug with --detach-keys whereby input matching a prefix of the detach key was not preserved#22943
SELinux labeling is now disabled when using --privileged mode #22993
If volume-mounted into a container, /etc/hosts, /etc/resolv.conf, /etc/hostname are no longer SELinux-relabeled #22993
Fix inconsistency in --tmpfs behavior regarding mount options #22438
Fix an issue where daemon hangs at startup #23148
Ignore SIGPIPE events to prevent journald restarts to crash docker in some cases #22460
Volume
Add support for local and global volume scopes (analogous to network scopes) #22077
Mount/Unmount operations now receives an opaque ID to allow volume drivers to differentiate between two callers #21015
Fix issue preventing to remove a volume in a corner case #22103
DEPRECATION
Environment variables DOCKER_CONTENT_TRUST_OFFLINE_PASSPHRASE andDOCKER_CONTENT_TRUST_TAGGING_PASSPHRASE have been renamed toDOCKER_CONTENT_TRUST_ROOT_PASSPHRASE and DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASErespectively #22574
Remove deprecated syslog-tag, gelf-tag, fluentd-tag log option in favor of the more generic tag one #22620
Remove deprecated feature of passing HostConfig at API container start #22570
Remove deprecated -f/--force flag on docker tag #23090
Remove deprecated /containers/
Deprecate the old 3-args form of docker import #23273
下载：
deb/rpm install: curl -fsSL https://test.docker.com/ | sh
Linux 64bit tgz: https://test.docker.com/builds/Linux/x86_64/docker-1.12.0-rc1.tgz
Darwin/OSX 64bit client tgz: https://test.docker.com/builds/Darwin/x86_64/docker-1.12.0-rc1.tgz
Windows 64bit zip: https://test.docker.com/builds/Windows/x86_64/docker-1.12.0-rc1.zip
Windows 32bit client zip: https://test.docker.com/builds/Windows/i386/docker-1.12.0-rc1.zip
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