Docker 1.9.0 RC4 发布，包含众多改进内容：

Runtime

• docker stats now returns block IO metrics (#15005)

• docker stats now details network stats per interface (#15786)

• Add ancestor=<image> filter to docker ps --filter flag to filter containers based on their ancestor images (#14570)

• Add label=<somelabel> filter to docker ps --filter to filter containers based on label (#16530)

• Add --kernel-memory flag to docker run (#14006)

• Add --message flag to docker import allowing to specify an optional message (#15711)

• Add --privileged flag to docker exec (#14113)

• Add --stop-signal flag to docker run allowing to replace the container process stopping signal (#15307)

• Add a new unless-stopped restart policy (#15348)

• Inspecting an image now returns tags (#13185)

• Add container size information to docker inspect (#15796)

• Add RepoTags and RepoDigests field to /images/{name:.*}/json (#17275)

• Remove the deprecated /container/ps endpoint from the API (#15972)

• Send and document correct HTTP codes for /exec/<name>/start (#16250)

• Share shm and mqueue between containers sharing IPC namespace (#15862)

• Event stream now shows OOM status when --oom-kill-disable is set (#16235)

• Ensure special network files (/etc/hosts etc.) are read-only if bind-mounted with ro option (#14965)

• Improve rmi performance (#16890)

• Do not update /etc/hosts for the default bridge network, except for links (#17325)

• Fix conflict with duplicate container names (#17389)

• Fix an issue with incorrect template execution in docker inspect (#17284)

• DEPRECATE -c short flag variant for --cpu-shares in docker run (#16271)

Client

• Allow docker import to import from local files (#11907)

Builder

• Add a STOPSIGNAL Dockerfile instruction allowing to set a different stop-signal for the container process (#15307)

• Add an ARG Dockerfile instruction and a --build-arg flag to docker build that allows to add build-time environment variables (#15182)

• Improve cache miss performance (#16890)

Storage

• devicemapper: Implement deferred deletion capability (#16381)

Networking

• docker network exits experimental and is part of standard release (#16645)

• New network top-level concept, with associated subcommands and API (#16645)

• Support for multiple isolated/micro-segmented networks (#16645)

• Built-in multihost networking using VXLAN based overlay driver (#14071)

• Support for third-party network plugins (#13424)

• Ability to dynamically connect containers to multiple networks (#16645)

• Support for user-defined IP address management via pluggable IPAM drivers (#16910)

• Add daemon flags --cluster-store and --cluster-advertise for built-in nodes discovery (#16229)

• Add --cluster-store-opt for setting up TLS settings (#16644)

• Add --dns-opt to the daemon (#16031)

• DEPRECATE following container NetworkSettings fields in API v1.21: EndpointID, Gateway,GlobalIPv6Address, GlobalIPv6PrefixLen, IPAddress, IPPrefixLen, IPv6Gateway and MacAddress. Those are now specific to the bridge network. Use NetworkSettings.Networks to inspect the networking settings of a container per network.

Volumes

• New top-level volume subcommand and API (#14242)

• Move API volume driver settings to host-specific config (#15798)

• Print an error message if volume name is not unique (#16009)

• Ensure volumes created from Dockerfiles always use the local volume driver (#15507)

• DEPRECATE auto-creating missing host paths for bind mounts (#16349)

Logging

• Add awslogs logging driver for Amazon CloudWatch (#15495)

• Add generic tag log option to allow customizing container/image information passed to driver (e.g. show container names) (#15384)

• Implement the docker logs endpoint for the journald driver (#13707)

• DEPRECATE driver-specific log tags (e.g. syslog-tag, etc.) (#15384)

Distribution

• docker search now works with partial names (#16509)

• Push optimization: avoid buffering to file (#15493)

• The daemon will display progress for images that were already being pulled by another client (#15489)

• Only permissions required for the current action being performed are requested (#)

• Renaming trust keys (and respective environment variables) from offline to root and tagging to repository (#16894)

• DEPRECATE trust key environment variables DOCKER_CONTENT_TRUST_OFFLINE_PASSPHRASE and DOCKER_CONTENT_TRUST_TAGGING_PASSPHRASE (#16894)

Security

• Add SELinux profiles to the rpm package (#15832)

• Fix various issues with AppArmor profiles provided in the deb package (#14609)

• Add AppArmor policy that prevents writing to /proc (#15571)

下载地址：

Ubuntu/Debian: curl -sSL https://test.docker.com/ | sh
Linux 64bit binary: https://test.docker.com/builds/Linux/x86_64/docker-1.9.0-rc4
Darwin/OSX 64bit client binary: https://test.docker.com/builds/Darwin/x86_64/docker-1.9.0-rc4
Darwin/OSX 32bit client binary: https://test.docker.com/builds/Darwin/i386/docker-1.9.0-rc4
Linux 64bit tgz: https://test.docker.com/builds/Linux/x86_64/docker-1.9.0-rc4.tgz
Windows 64bit client binary: https://test.docker.com/builds/Windows/x86_64/docker-1.9.0-rc4.exe
Windows 32bit client binary: https://test.docker.com/builds/Windows/i386/docker-1.9.0-rc4.exe