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

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.

## Version 1.5.0
(2015-02-03)

For a complete list of patches, fixes, and other improvements, see the
[merge PR on GitHub](https://github.com/docker/docker/pull/10286).

*New Features*

* [1.6] The Docker daemon will no longer ignore unknown commands
  while processing a `Dockerfile`. Instead it will generate an error and halt
  processing.
* The Docker daemon has now supports for IPv6 networking between containers
  and on the `docker0` bridge. For more information see the
  [IPv6 networking reference](/articles/networking/#ipv6).
* Docker container filesystems can now be set to`--read-only`, restricting your
  container to writing to volumes [PR# 10093](https://github.com/docker/docker/pull/10093).
* A new `docker stats CONTAINERID` command has been added to allow users to view a
  continuously updating stream of container resource usage statistics. See the
  [`stats` command line reference](/reference/commandline/cli/#stats) and the
  [container `stats` API reference](/reference/api/docker_remote_api_v1.17/#get-container-stats-based-on-resource-usage).
  **Note**: this feature is only enabled for the `libcontainer` exec-driver at this point.
* Users can now specify the file to use as the `Dockerfile` by running
  `docker build -f alternate.dockerfile .`. This will allow the definition of multiple
  `Dockerfile`s for a single project. See the [`docker build` command reference](
/reference/commandline/cli/#build) for more information.
* The v1 Open Image specification has been created to document the current Docker image
  format and metadata. Please see [the Open Image specification document](
https://github.com/docker/docker/blob/master/image/spec/v1.md) for more details.
* This release also includes a number of significant performance improvements in
  build and image management ([PR #9720](https://github.com/docker/docker/pull/9720),
  [PR #8827](https://github.com/docker/docker/pull/8827))
* The `docker inspect` command now lists ExecIDs generated for each `docker exec` process.
  See [PR #9800](https://github.com/docker/docker/pull/9800)) for more details.
* The `docker inspect` command now shows the number of container restarts when there
  is a restart policy ([PR #9621](https://github.com/docker/docker/pull/9621))
* This version of Docker is built using Go 1.4

> **Note:**
> Development history prior to version 1.0 can be found by
> searching in the [Docker GitHub repo](https://github.com/docker/docker).

## Known Issues

This section lists significant known issues present in Docker as of release
date. It is not exhaustive; it lists only issues with potentially significant
impact on users. This list will be updated as issues are resolved.

* **Unexpected File Permissions in Containers**
An idiosyncrasy in AUFS prevents permissions from propagating predictably
between upper and lower layers. This can cause issues with accessing private
keys, database instances, etc.

For systems that have recent aufs version (i.e., `dirperm1` mount option can
be set), docker will attempt to fix the issue automatically by mounting
the layers with `dirperm1` option. More details on `dirperm1` option can be
found at [`aufs` man page](http://aufs.sourceforge.net/aufs3/man.html)

For complete information and workarounds see
[Github Issue 783](https://github.com/docker/docker/issues/783).

* **Docker Hub incompatible with Safari 8**
Docker Hub has multiple issues displaying on Safari 8, the default browser
for OS X 10.10 (Yosemite). Users should access the hub using a different
browser. Most notably, changes in the way Safari handles cookies means that the
user is repeatedly logged out. For more information, see the [Docker
forum post](https://forums.docker.com/t/new-safari-in-yosemite-issue/300).