moby--moby/docs/sources/release-notes.md

page_title: Docker 1.x series release notes page_description: Release notes for Docker 1.x. page_keywords: docker, documentation, about, technology, understanding, release

Release notes version 1.6.0

(2015-04-16)

You can view release notes for earlier version of Docker by selecting the desired version from the drop-down list at the top right of this page. For the formal release announcement, see the Docker blog.

Docker Engine 1.6.0 features

For a complete list of engine patches, fixes, and other improvements, see the merge PR on GitHub. You'll also find a changelog in the project repository.

Feature	Description
Container and Image Labels	Labels allow you to attach user-defined metadata to containers and images that can be used by your tools. For additional information on using labels, see Apply custom metadata in the documentation.
Windows Client preview	The Windows Client can be used just like the Mac OS X client is today with a remote host. Our testing infrastructure was scaled out to accommodate Windows Client testing on every PR to the Engine. See the Azure blog for details on using this new client.
Logging drivers	The new logging driver follows the exec driver and storage driver concepts already available in Engine today. There is a new option --log-driver to docker run command. See the run reference for a description on how to use this option.
Image digests	When you pull, build, or run images, you specify them in the form namespace/repository:tag, or even just repository. In this release, you are now able to pull, run, build and refer to images by a new content addressable identifier called a “digest” with the syntax namespace/repo@digest. See the the command line reference for examples of using the digest.
Custom cgroups	Containers are made from a combination of namespaces, capabilities, and cgroups. Docker already supports custom namespaces and capabilities. Additionally, in this release we’ve added support for custom cgroups. Using the --cgroup-parent flag, you can pass a specific cgroup to run a container in. See the command line reference for more information.
Ulimits	You can now specify the default ulimit settings for all containers when configuring the daemon. For example:docker -d --default-ulimit nproc=1024:2048 See Default Ulimits in this documentation.
Commit and import Dockerfile	You can now make changes to images on the fly without having to re-build the entire image. The feature commit --change and import --change allows you to apply standard changes to a new image. These are expressed in the Dockerfile syntax and used to modify the image. For details on how to use these, see the commit and import.

Known issues in Engine

This section lists significant known issues present in Docker as of release date. For an exhaustive list of issues, see the issues list on the project repository.

• Unexpected File Permissions in Containers An idiosyncrasy in AUFS prevented permissions from propagating predictably between upper and lower layers. This caused issues with accessing private keys, database instances, etc. This issue was closed in this release: Github Issue 783.

• Docker Hub incompatible with Safari 8 Docker Hub had multiple issues displaying on Safari 8, the default browser for OS X 10.10 (Yosemite). Most notably, changes in the way Safari handled cookies means that the user was repeatedly logged out. Recently, Safari fixed the bug that was causing all the issues. If you upgrade to Safari 8.0.5 which was just released last week and see if that fixes your issues. You might have to flush your cookies if it doesn't work right away. For more information, see the Docker forum post.

Docker Registry 2.0 features

This release includes Registry 2.0. The Docker Registry is a central server for pushing and pulling images. In this release, it was completely rewritten in Go around a new set of distribution APIs

• Webhook notifications: You can now configure the Registry to send Webhooks when images are pushed. Spin off a CI build, send a notification to IRC – whatever you want! Included in the documentation is a detailed notification specification.

• Native TLS support: This release makes it easier to secure a registry with TLS. This documentation includes expanded examples of secure deployments.

• New Distribution APIs: This release includes an expanded set of new distribution APIs. You can read the detailed specification here.

Docker Compose 1.2

For a complete list of compose patches, fixes, and other improvements, see the changelog in the project repository. The project also makes a set of release notes on the project.

• extends: You can use extends to share configuration between services with the keyword “extends”. With extends, you can refer to a service defined elsewhere and include its configuration in a locally-defined service, while also adding or overriding configuration as necessary. The documentation describes [how to use extends in your configuration](http://docs.docker.com/compose/extends/#extending-services-in- compose).

• Relative directory handling may cause breaking change: Compose now treats directories passed to build, filenames passed to env_file and volume host paths passed to volumes as relative to the configuration file's directory. Previously, they were treated as relative to the directory where you were running docker-compose. In the majority of cases, the location of the configuration file and where you ran docker-compose were the same directory. Now, you can use the -f|--file argument to specify a configuration file in another directory.

Docker Swarm 0.2

You'll find the release for download on GitHub and the documentation here. This release includes the following features:

• Spread strategy: A new strategy for scheduling containers on your cluster which evenly spreads them over available nodes.
• More Docker commands supported: More progress has been made towards supporting the complete Docker API, such as pulling and inspecting images.
• Clustering drivers: There are not any third-party drivers yet, but the first steps have been made towards making a pluggable driver interface that will make it possible to use Swarm with clustering systems such as Mesos.

Docker Machine 0.2 Pre-release

You'll find the release for download on GitHub and the documentation here. For a complete list of machine changes see [the changelog in the project repository](https://github.com/docker/machine/blob/master/CHANGES.md#020-2015-03 -22).

• Cleaner driver interface: It is now much easier to write drivers for providers.
• More reliable and consistent provisioning: Provisioning servers is now handled centrally by Machine instead of letting each driver individually do it.
• Regenerate TLS certificates: A new command has been added to regenerate a host’s TLS certificates for good security practice and for if a host’s IP address changes.