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46th chunk of `content/manuals/engine/release-notes/prior-releases.md`
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- Use mock for search tests.
- Update to double-dash everywhere.
- Move .dockerenv parsing to lxc driver.
- Move all bind-mounts in the container inside the namespace.
- Don't use separate bind mount for container.
- Always symlink /dev/ptmx for libcontainer.
- Don't kill by pid for other drivers.
- Add initial logging to libcontainer.
* Sort by port in `docker ps`.
- Move networking drivers into runtime top level package.
+ Add --no-prune to `docker rmi`.
+ Add time since exit in `docker ps`.
- graphdriver: add build tags.
- Prevent allocation of previously allocated ports & prevent improve port allocation.
* Add support for --since/--before in `docker ps`.
- Clean up container stop.
+ Add support for configurable dns search domains.
- Add support for relative WORKDIR instructions.
- Add --output flag for docker save.
- Remove duplication of DNS entries in config merging.
- Add cpuset.cpus to cgroups and native driver options.
- Remove docker-ci.
- Promote btrfs. btrfs is no longer considered experimental.
- Add --input flag to `docker load`.
- Return error when existing bridge doesn't match IP address.
- Strip comments before parsing line continuations to avoid interpreting instructions as comments.
- Fix TestOnlyLoopbackExistsWhenUsingDisableNetworkOption to ignore "DOWN" interfaces.
- Add systemd implementation of cgroups and make containers show up as systemd units.
- Fix commit and import when no repository is specified.
- Remount /var/lib/docker as --private to fix scaling issue.
- Use the environment's proxy when pinging the remote registry.
- Reduce error level from harmless errors.
* Allow --volumes-from to be individual files.
- Fix expanding buffer in StdCopy.
- Set error regardless of attach or stdin. This fixes #3364.
- Add support for --env-file to load environment variables from files.
- Symlink /etc/mtab and /proc/mounts.
- Allow pushing a single tag.
- Shut down containers cleanly at shutdown and wait forever for the containers to shut down. This makes container shutdown on daemon shutdown work properly via SIGTERM.
- Don't throw error when starting an already running container.
- Fix dynamic port allocation limit.
- remove setupDev from libcontainer.
- Add API version to `docker version`.
- Return correct exit code when receiving signal and make SIGQUIT quit without cleanup.
- Fix --volumes-from mount failure.
- Allow non-privileged containers to create device nodes.
- Skip login tests because of external dependency on a hosted service.
- Deprecate `docker images --tree` and `docker images --viz`.
- Deprecate `docker insert`.
- Include base abstraction for apparmor. This fixes some apparmor related problems on Ubuntu 14.04.
- Add specific error message when hitting 401 over HTTP on push.
- Fix absolute volume check.
- Remove volumes-from from the config.
- Move DNS options to hostconfig.
- Update the apparmor profile for libcontainer.
- Add deprecation notice for `docker commit -run`.

## 0.9.1 (2014-03-24)

### Builder
- Fix printing multiple messages on a single line. Fixes broken output during builds.

### Documentation
- Fix external link on security of containers.

### Contrib
- Fix init script cgroup mounting workarounds to be more similar to cgroupfs-mount and thus work properly.
- Add variable for DOCKER_LOGFILE to sysvinit and use append instead of overwrite in opening the logfile.

### Hack
- Generate md5 and sha256 hashes when building, and upload them via hack/release.sh.

### Remote API
- Fix content-type detection in `docker cp`.

### Runtime
- Use BSD raw mode on Darwin. Fixes nano, tmux and others.
- Only unshare the mount namespace for execin.
- Retry to retrieve the layer metadata up to 5 times for `docker pull`.
- Merge existing config when committing.
- Fix panic in monitor.
- Disable daemon startup timeout.
- Fix issue #4681: add loopback interface when networking is disabled.
- Add failing test case for issue #4681.
- Send SIGTERM to child, instead of SIGKILL.
- Show the driver and the kernel version in `docker info` even when not in debug mode.

Title: Docker Updates and Bug Fixes in Version 0.9.1
Summary
This section summarizes updates and bug fixes in Docker, including the addition of `--input` flag to `docker load`, fixes for bridge IP address matching, comment parsing, and loopback interface handling. It also includes systemd integration for cgroups, fixes for commit and import, and proxy usage for remote registries. The update allows `--volumes-from` to use individual files, adds support for `--env-file`, and introduces symlinking for `/etc/mtab` and `/proc/mounts`. Clean shutdown of containers is implemented, along with fixes for dynamic port allocation and volume mounting. Furthermore, it deprecates certain commands and includes updates to apparmor profiles and DNS options. Version 0.9.1 addresses issues related to printing messages, security documentation, cgroup mounting, content-type detection, BSD raw mode, mount namespaces, layer metadata retrieval, daemon timeout, and signal handling.