**IMPORTANT**: Docker 1.12 ships with an updated systemd unit file for rpm
based installs (which includes RHEL, Fedora, CentOS, and Oracle Linux 7). When
upgrading from an older version of docker, the upgrade process may not
automatically install the updated version of the unit file, or fail to start
the docker service if;
- the systemd unit file (`/usr/lib/systemd/system/docker.service`) contains local changes, or
- a systemd drop-in file is present, and contains `-H fd://` in the `ExecStart` directive
Starting the docker service will produce an error:
Failed to start docker.service: Unit docker.socket failed to load: No such file or directory.
or
no sockets found via socket activation: make sure the service was started by systemd.
To resolve this:
- Backup the current version of the unit file, and replace the file with the
[version that ships with docker 1.12](https://raw.githubusercontent.com/docker/docker/v1.12.0/contrib/init/systemd/docker.service.rpm)
- Remove the `Requires=docker.socket` directive from the `/usr/lib/systemd/system/docker.service` file if present
- Remove `-H fd://` from the `ExecStart` directive (both in the main unit file, and in any drop-in files present).
After making those changes, run `sudo systemctl daemon-reload`, and `sudo
systemctl restart docker` to reload changes and (re)start the docker daemon.
### Client
* Add `Joined at` information in `node inspect --pretty` [#25512](https://github.com/docker/docker/pull/25512)
- Fix a crash on `service inspect` [#25454](https://github.com/docker/docker/pull/25454)
- Fix issue preventing `service update --env-add` to work as intended [#25427](https://github.com/docker/docker/pull/25427)
- Fix issue preventing `service update --publish-add` to work as intended [#25428](https://github.com/docker/docker/pull/25428)
- Remove `service update --network-add` and `service update --network-rm` flags
because this feature is not yet implemented in 1.12, but was inadvertently added
to the client in 1.12.0 [#25646](https://github.com/docker/docker/pull/25646)
### Contrib
+ Official ARM installation for Debian Jessie, Ubuntu Trusty, and Raspbian Jessie [#24815](https://github.com/docker/docker/pull/24815) [#25591](https://github.com/docker/docker/pull/25637)
- Add selinux policy per distro/version, fixing issue preventing successful installation on Fedora 24, and Oracle Linux [#25334](https://github.com/docker/docker/pull/25334) [#25593](https://github.com/docker/docker/pull/25593)
### Networking
- Fix issue that prevented containers to be accessed by hostname with Docker overlay driver in Swarm Mode [#25603](https://github.com/docker/docker/pull/25603) [#25648](https://github.com/docker/docker/pull/25648)
- Fix random network issues on service with published port [#25603](https://github.com/docker/docker/pull/25603)
- Fix unreliable inter-service communication after scaling down and up [#25603](https://github.com/docker/docker/pull/25603)
- Fix issue where removing all tasks on a node and adding them back breaks connectivity with other services [#25603](https://github.com/docker/docker/pull/25603)
- Fix issue where a task that fails to start results in a race, causing a `network xxx not found` error that masks the actual error [#25550](https://github.com/docker/docker/pull/25550)
- Relax validation of SRV records for external services that use SRV records not formatted according to RFC 2782 [#25739](https://github.com/docker/docker/pull/25739)
### Plugins (experimental)
* Make daemon events listen for plugin lifecycle events [#24760](https://github.com/docker/docker/pull/24760)
* Check for plugin state before enabling plugin [#25033](https://github.com/docker/docker/pull/25033)
- Remove plugin root from filesystem on `plugin rm` [#25187](https://github.com/docker/docker/pull/25187)
- Prevent deadlock when more than one plugin is installed [#25384](https://github.com/docker/docker/pull/25384)
### Runtime
* Mask join tokens in daemon logs [#25346](https://github.com/docker/docker/pull/25346)
- Fix `docker ps --filter` causing the results to no longer be sorted by creation time [#25387](https://github.com/docker/docker/pull/25387)
- Fix various crashes [#25053](https://github.com/docker/docker/pull/25053)
### Security
* Add `/proc/timer_list` to the masked paths list to prevent information leak from the host [#25630](https://github.com/docker/docker/pull/25630)
* Allow systemd to run with only `--cap-add SYS_ADMIN` rather than having to also add `--cap-add DAC_READ_SEARCH` or disabling seccomp filtering [#25567](https://github.com/docker/docker/pull/25567)
### Swarm
- Fix an issue where the swarm can get stuck electing a new leader after quorum is lost [#25055](https://github.com/docker/docker/issues/25055)
- Fix unwanted rescheduling of containers after a leader failover [#25017](https://github.com/docker/docker/issues/25017)
- Change swarm root CA key to P256 curve [swarmkit#1376](https://github.com/docker/swarmkit/pull/1376)
- Allow forced removal of a node from a swarm [#25159](https://github.com/docker/docker/pull/25159)
- Fix connection leak when a node leaves a swarm [swarmkit/#1277](https://github.com/docker/swarmkit/pull/1277)
- Backdate swarm certificates by one hour to tolerate more clock skew [swarmkit/#1243](https://github.com/docker/swarmkit/pull/1243)
- Avoid high CPU use with many unschedulable tasks [swarmkit/#1287](https://github.com/docker/swarmkit/pull/1287)
- Fix issue with global tasks not starting up [swarmkit/#1295](https://github.com/docker/swarmkit/pull/1295)
- Persist local volume options after a daemon restart [#25316](https://github.com/docker/docker/pull/25316)
- Fix an issue where the mount ID was not returned on volume unmount [#25333](https://github.com/docker/docker/pull/25333)
- Fix an issue where a volume mount could inadvertently create a bind mount [#25309](https://github.com/docker/docker/pull/25309)
-`docker service create --mount type=bind,...` now correctly validates if the source path exists, instead of creating it [#25494](https://github.com/docker/docker/pull/25494)
+ New `HEALTHCHECK` Dockerfile instruction to support user-defined healthchecks [#23218](https://github.com/docker/docker/pull/23218)
+ New `SHELL` Dockerfile instruction to specify the default shell when using the shell form for commands in a Dockerfile [#22489](https://github.com/docker/docker/pull/22489)
+ Add `#escape=` Dockerfile directive to support platform-specific parsing of file paths in Dockerfile [#22268](https://github.com/docker/docker/pull/22268)
+ Add support for comments in `.dockerignore` [#23111](https://github.com/docker/docker/pull/23111)
* Support for UTF-8 in Dockerfiles [#23372](https://github.com/docker/docker/pull/23372)
* Skip UTF-8 BOM bytes from `Dockerfile` and `.dockerignore` if exist [#23234](https://github.com/docker/docker/pull/23234)
* Windows: support for `ARG` to match Linux [#22508](https://github.com/docker/docker/pull/22508)
- Fix error message when building using a daemon with the bridge network disabled [#22932](https://github.com/docker/docker/pull/22932)
### Contrib
* Enable seccomp for Centos 7 and Oracle Linux 7 [#22344](https://github.com/docker/docker/pull/22344)
- Remove MountFlags in systemd unit to allow shared mount propagation [#22806](https://github.com/docker/docker/pull/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](https://github.com/docker/docker/pull/22445)
* Registry operations now honor the `ALL_PROXY` environment variable [#22316](https://github.com/docker/docker/pull/22316)
* Provide more information to the user on `docker load` [#23377](https://github.com/docker/docker/pull/23377)
* Always save registry digest metadata about images pushed and pulled [#23996](https://github.com/docker/docker/pull/23996)
### Logging
+ Syslog logging driver now supports DGRAM sockets [#21613](https://github.com/docker/docker/pull/21613)
+ Add `--details` option to `docker logs` to also display log tags [#21889](https://github.com/docker/docker/pull/21889)
+ Enable syslog logger to have access to env and labels [#21724](https://github.com/docker/docker/pull/21724)
+ An additional syslog-format option `rfc5424micro` to allow microsecond resolution in syslog timestamp [#21844](https://github.com/docker/docker/pull/21844)
* Inherit the daemon log options when creating containers [#21153](https://github.com/docker/docker/pull/21153)
* Remove `docker/` prefix from log messages tag and replace it with `{{.DaemonName}}` so that users have the option of changing the prefix [#22384](https://github.com/docker/docker/pull/22384)
### Networking
+ Built-in Virtual-IP based internal and ingress load-balancing using IPVS [#23361](https://github.com/docker/docker/pull/23361)
+ Routing Mesh using ingress overlay network [#23361](https://github.com/docker/docker/pull/23361)
+ Secured multi-host overlay networking using encrypted control-plane and Data-plane [#23361](https://github.com/docker/docker/pull/23361)
+ MacVlan driver is out of experimental [#23524](https://github.com/docker/docker/pull/23524)
+ Add `driver` filter to `network ls` [#22319](https://github.com/docker/docker/pull/22319)
+ Adding `network` filter to `docker ps --filter` [#23300](https://github.com/docker/docker/pull/23300)
+ Add `--link-local-ip` flag to `create`, `run` and `network connect` to specify a container's link-local address [#23415](https://github.com/docker/docker/pull/23415)
+ Add network label filter support [#21495](https://github.com/docker/docker/pull/21495)
* Removed dependency on external KV-Store for Overlay networking in Swarm-Mode [#23361](https://github.com/docker/docker/pull/23361)
* Add container's short-id as default network alias [#21901](https://github.com/docker/docker/pull/21901)
*`run` options `--dns` and `--net=host` are no longer mutually exclusive [#22408](https://github.com/docker/docker/pull/22408)
- Fix DNS issue when renaming containers with generated names [#22716](https://github.com/docker/docker/pull/22716)
- Allow both `network inspect -f {{.Id}}` and `network inspect -f {{.ID}}` to address inconsistency with inspect output [#23226](https://github.com/docker/docker/pull/23226)
### Plugins (experimental)
+ New `plugin` command to manager plugins with `install`, `enable`, `disable`, `rm`, `inspect`, `set` subcommands [#23446](https://github.com/docker/docker/pull/23446)
### Remote API (v1.24) & Client
+ Split the binary into two: `docker` (client) and `dockerd` (daemon) [#20639](https://github.com/docker/docker/pull/20639)
+ Add `before` and `since` filters to `docker images --filter` [#22908](https://github.com/docker/docker/pull/22908)
+ Add `--limit` option to `docker search` [#23107](https://github.com/docker/docker/pull/23107)
+ Add `--filter` option to `docker search` [#22369](https://github.com/docker/docker/pull/22369)
+ Add security options to `docker info` output [#21172](https://github.com/docker/docker/pull/21172) [#23520](https://github.com/docker/docker/pull/23520)
+ Add insecure registries to `docker info` output [#20410](https://github.com/docker/docker/pull/20410)
+ Extend Docker authorization with TLS user information [#21556](https://github.com/docker/docker/pull/21556)
+ devicemapper: expose Mininum Thin Pool Free Space through `docker info` [#21945](https://github.com/docker/docker/pull/21945)
* API now returns a JSON object when an error occurs making it more consistent [#22880](https://github.com/docker/docker/pull/22880)
- Prevent `docker run -i --restart` from hanging on exit [#22777](https://github.com/docker/docker/pull/22777)
- Fix API/CLI discrepancy on hostname validation [#21641](https://github.com/docker/docker/pull/21641)
- Fix discrepancy in the format of sizes in `stats` from HumanSize to BytesSize [#21773](https://github.com/docker/docker/pull/21773)
- authz: when request is denied return forbbiden exit code (403) [#22448](https://github.com/docker/docker/pull/22448)
+ Add `--live-restore` daemon flag to keep containers running when daemon shuts down, and regain control on startup [#23213](https://github.com/docker/docker/pull/23213)
+ Ability to add OCI-compatible runtimes (via `--add-runtime` daemon flag) and select one with `--runtime` on `create` and `run` [#22983](https://github.com/docker/docker/pull/22983)
+ New `overlay2` graphdriver for Linux 4.0+ with multiple lower directory support [#22126](https://github.com/docker/docker/pull/22126)
+ New load/save image events [#22137](https://github.com/docker/docker/pull/22137)
+ Add support for reloading daemon configuration through systemd [#22446](https://github.com/docker/docker/pull/22446)
+ Add disk quota support for btrfs [#19651](https://github.com/docker/docker/pull/19651)
+ Add disk quota support for zfs [#21946](https://github.com/docker/docker/pull/21946)
+ Add support for `docker run --pid=container:<id>` [#22481](https://github.com/docker/docker/pull/22481)
+ Align default seccomp profile with selected capabilities [#22554](https://github.com/docker/docker/pull/22554)
+ Add a `daemon reload` event when the daemon reloads its configuration [#22590](https://github.com/docker/docker/pull/22590)
+ Add `trace` capability in the pprof profiler to show execution traces in binary form [#22715](https://github.com/docker/docker/pull/22715)
+ Add a `detach` event [#22898](https://github.com/docker/docker/pull/22898)
+ Add support for setting sysctls with `--sysctl` [#19265](https://github.com/docker/docker/pull/19265)
+ Add `--storage-opt` flag to `create` and `run` allowing to set `size` on devicemapper [#19367](https://github.com/docker/docker/pull/19367)
+ Add `--oom-score-adjust` daemon flag with a default value of `-500` making the daemon less likely to be killed before containers [#24516](https://github.com/docker/docker/pull/24516)
* Undeprecate the `-c` short alias of `--cpu-shares` on `run`, `build`, `create`, `update` [#22621](https://github.com/docker/docker/pull/22621)
* Prevent from using aufs and overlay graphdrivers on an eCryptfs mount [#23121](https://github.com/docker/docker/pull/23121)
- Fix issues with tmpfs mount ordering [#22329](https://github.com/docker/docker/pull/22329)
- Created containers are no longer listed on `docker ps -a -f exited=0` [#21947](https://github.com/docker/docker/pull/21947)
- Fix an issue where containers are stuck in a "Removal In Progress" state [#22423](https://github.com/docker/docker/pull/22423)
- Fix bug that was returning an HTTP 500 instead of a 400 when not specifying a command on run/create [#22762](https://github.com/docker/docker/pull/22762)
- Fix bug with `--detach-keys` whereby input matching a prefix of the detach key was not preserved [#22943](https://github.com/docker/docker/pull/22943)
- SELinux labeling is now disabled when using `--privileged` mode [#22993](https://github.com/docker/docker/pull/22993)
- If volume-mounted into a container, `/etc/hosts`, `/etc/resolv.conf`, `/etc/hostname` are no longer SELinux-relabeled [#22993](https://github.com/docker/docker/pull/22993)
- Fix inconsistency in `--tmpfs` behavior regarding mount options [#22438](https://github.com/docker/docker/pull/22438)
- Fix an issue where daemon hangs at startup [#23148](https://github.com/docker/docker/pull/23148)
- Ignore SIGPIPE events to prevent journald restarts to crash docker in some cases [#22460](https://github.com/docker/docker/pull/22460)
- Containers are not removed from stats list on error [#20835](https://github.com/docker/docker/pull/20835)
- Fix `on-failure` restart policy when daemon restarts [#20853](https://github.com/docker/docker/pull/20853)
- Fix an issue with `stats` when a container is using another container's network [#21904](https://github.com/docker/docker/pull/21904)
### Swarm Mode
+ New `swarm` command to manage swarms with `init`, `join`, `join-token`, `leave`, `update` subcommands [#23361](https://github.com/docker/docker/pull/23361) [#24823](https://github.com/docker/docker/pull/24823)
+ New `service` command to manage swarm-wide services with `create`, `inspect`, `update`, `rm`, `ps` subcommands [#23361](https://github.com/docker/docker/pull/23361) [#25140](https://github.com/docker/docker/pull/25140)
+ New `node` command to manage nodes with `accept`, `promote`, `demote`, `inspect`, `update`, `ps`, `ls` and `rm` subcommands [#23361](https://github.com/docker/docker/pull/23361) [#25140](https://github.com/docker/docker/pull/25140)
+ (experimental) New `stack` and `deploy` commands to manage and deploy multi-service applications [#23522](https://github.com/docker/docker/pull/23522) [#25140](https://github.com/docker/docker/pull/25140)
### Volume
+ Add support for local and global volume scopes (analogous to network scopes) [#22077](https://github.com/docker/docker/pull/22077)
+ Allow volume drivers to provide a `Status` field [#21006](https://github.com/docker/docker/pull/21006)
+ Add name/driver filter support for volume [#21361](https://github.com/docker/docker/pull/21361)
* Mount/Unmount operations now receives an opaque ID to allow volume drivers to differentiate between two callers [#21015](https://github.com/docker/docker/pull/21015)
- Fix issue preventing to remove a volume in a corner case [#22103](https://github.com/docker/docker/pull/22103)
- Windows: Enable auto-creation of host-path to match Linux [#22094](https://github.com/docker/docker/pull/22094)
### DEPRECATION
* Environment variables `DOCKER_CONTENT_TRUST_OFFLINE_PASSPHRASE` and `DOCKER_CONTENT_TRUST_TAGGING_PASSPHRASE` have been renamed
to `DOCKER_CONTENT_TRUST_ROOT_PASSPHRASE` and `DOCKER_CONTENT_TRUST_REPOSITORY_PASSPHRASE` respectively [#22574](https://github.com/docker/docker/pull/22574)
* Remove deprecated `syslog-tag`, `gelf-tag`, `fluentd-tag` log option in favor of the more generic `tag` one [#22620](https://github.com/docker/docker/pull/22620)
* Remove deprecated feature of passing HostConfig at API container start [#22570](https://github.com/docker/docker/pull/22570)
* Remove deprecated `-f`/`--force` flag on docker tag [#23090](https://github.com/docker/docker/pull/23090)
- Fix a stale endpoint issue on overlay networks during ungraceful restart ([#23015](https://github.com/docker/docker/pull/23015))
- Fix an issue where the wrong port could be reported by `docker inspect/ps/port` ([#22997](https://github.com/docker/docker/pull/22997))
### Runtime
- Fix a potential panic when running `docker build` ([#23032](https://github.com/docker/docker/pull/23032))
- Fix interpretation of `--user` parameter ([#22998](https://github.com/docker/docker/pull/22998))
- Fix a bug preventing container statistics to be correctly reported ([#22955](https://github.com/docker/docker/pull/22955))
- Fix an issue preventing container to be restarted after daemon restart ([#22947](https://github.com/docker/docker/pull/22947))
- Fix issues when running 32 bit binaries on Ubuntu 16.04 ([#22922](https://github.com/docker/docker/pull/22922))
- Fix a possible deadlock on image deletion and container attach ([#22918](https://github.com/docker/docker/pull/22918))
- Fix an issue where containers fail to start after a daemon restart if they depend on a containerized cluster store ([#22561](https://github.com/docker/docker/pull/22561))
- Fix an issue causing `docker ps` to hang on CentOS when using devicemapper ([#22168](https://github.com/docker/docker/pull/22168), [#23067](https://github.com/docker/docker/pull/23067))
- Fix a bug preventing to `docker exec` into a container when using devicemapper ([#22168](https://github.com/docker/docker/pull/22168), [#23067](https://github.com/docker/docker/pull/23067))
- Fix schema2 manifest media type to be of type `application/vnd.docker.container.image.v1+json` ([#21949](https://github.com/docker/docker/pull/21949))
### Documentation
+ Add missing API documentation for changes introduced with 1.11.0 ([#22048](https://github.com/docker/docker/pull/22048))
### Builder
* Append label passed to `docker build` as arguments as an implicit `LABEL` command at the end of the processed `Dockerfile` ([#22184](https://github.com/docker/docker/pull/22184))
### Networking
- Fix a panic that would occur when forwarding DNS query ([#22261](https://github.com/docker/docker/pull/22261))
- Fix an issue where OS threads could end up within an incorrect network namespace when using user defined networks ([#22261](https://github.com/docker/docker/pull/22261))
### Runtime
- Fix a bug preventing labels configuration to be reloaded via the config file ([#22299](https://github.com/docker/docker/pull/22299))
- Fix a regression where container mounting `/var/run` would prevent other containers from being removed ([#22256](https://github.com/docker/docker/pull/22256))
- Fix an issue where it would be impossible to update both `memory-swap` and `memory` value together ([#22255](https://github.com/docker/docker/pull/22255))
- Fix a regression from 1.11.0 where the `/auth` endpoint would not initialize `serveraddress` if it is not provided ([#22254](https://github.com/docker/docker/pull/22254))
- Add missing cleanup of container temporary files when cancelling a schedule restart ([#22237](https://github.com/docker/docker/pull/22237))
**IMPORTANT**: With Docker 1.11, a Linux docker installation is now made of 4 binaries (`docker`, [`docker-containerd`](https://github.com/docker/containerd), [`docker-containerd-shim`](https://github.com/docker/containerd) and [`docker-runc`](https://github.com/opencontainers/runc)). If you have scripts relying on docker being a single static binaries, please make sure to update them. Interaction with the daemon stay the same otherwise, the usage of the other binaries should be transparent. A Windows docker installation remains a single binary, `docker.exe`.
- Fix a bug where Docker would not use the correct uid/gid when processing the `WORKDIR` command ([#21033](https://github.com/docker/docker/pull/21033))
- Fix a bug where copy operations with userns would not use the proper uid/gid ([#20782](https://github.com/docker/docker/pull/20782), [#21162](https://github.com/docker/docker/pull/21162))
### Client
* Usage of the `:` separator for security option has been deprecated. `=` should be used instead ([#21232](https://github.com/docker/docker/pull/21232))
+ The client user agent is now passed to the registry on `pull`, `build`, `push`, `login` and `search` operations ([#21306](https://github.com/docker/docker/pull/21306), [#21373](https://github.com/docker/docker/pull/21373))
* Allow setting the Domainname and Hostname separately through the API ([#20200](https://github.com/docker/docker/pull/20200))
* Docker info will now warn users if it can not detect the kernel version or the operating system ([#21128](https://github.com/docker/docker/pull/21128))
- Fix an issue where `docker stats --no-stream` output could be all 0s ([#20803](https://github.com/docker/docker/pull/20803))
- Fix a bug where some newly started container would not appear in a running `docker stats` command ([#20792](https://github.com/docker/docker/pull/20792))
* Post processing is no longer enabled for linux-cgo terminals ([#20587](https://github.com/docker/docker/pull/20587))
- Values to `--hostname` are now refused if they do not comply with [RFC1123](https://tools.ietf.org/html/rfc1123) ([#20566](https://github.com/docker/docker/pull/20566))
+ Docker learned how to use a SOCKS proxy ([#20366](https://github.com/docker/docker/pull/20366), [#18373](https://github.com/docker/docker/pull/18373))
+ Docker now supports external credential stores ([#20107](https://github.com/docker/docker/pull/20107))
*`docker ps` now supports displaying the list of volumes mounted inside a container ([#20017](https://github.com/docker/docker/pull/20017))
- Docker now cleans after itself if a save/export command fails ([#17849](https://github.com/docker/docker/pull/17849))
* Docker load learned how to display a progress bar ([#17329](https://github.com/docker/docker/pull/17329), [#120078](https://github.com/docker/docker/pull/20078))
- Fix a panic that could occur on error while pushing to a registry with a misconfigured token service ([#21212](https://github.com/docker/docker/pull/21212))
+ All first-level delegation roles are now signed when doing a trusted push ([#21046](https://github.com/docker/docker/pull/21046))
+ OAuth support for registries was added ([#20970](https://github.com/docker/docker/pull/20970))
*`docker login` now handles token using the implementation found in [docker/distribution](https://github.com/docker/distribution) ([#20832](https://github.com/docker/docker/pull/20832))
*`docker login` will no longer prompt for an email ([#20565](https://github.com/docker/docker/pull/20565))
* Docker will now fallback to registry V1 if no basic auth credentials are available ([#20241](https://github.com/docker/docker/pull/20241))
* Docker will now try to resume layer download where it left off after a network error/timeout ([#19840](https://github.com/docker/docker/pull/19840))
- Fix generated manifest mediaType when pushing cross-repository ([#19509](https://github.com/docker/docker/pull/19509))
- Fix docker requesting additional push credentials when pulling an image if Content Trust is enabled ([#20382](https://github.com/docker/docker/pull/20382))
- Fix a race in the journald log driver ([#21311](https://github.com/docker/docker/pull/21311))
* Docker syslog driver now uses the RFC-5424 format when emitting logs ([#20121](https://github.com/docker/docker/pull/20121))
* Docker GELF log driver now allows to specify the compression algorithm and level via the `gelf-compression-type` and `gelf-compression-level` options ([#19831](https://github.com/docker/docker/pull/19831))
* Docker daemon learned to output uncolorized logs via the `--raw-logs` options ([#19794](https://github.com/docker/docker/pull/19794))
+ Docker, on Windows platform, now includes an ETW (Event Tracing in Windows) logging driver named `etwlogs` ([#19689](https://github.com/docker/docker/pull/19689))
* Journald log driver learned how to handle tags ([#19564](https://github.com/docker/docker/pull/19564))
+ The fluentd log driver learned the following options: `fluentd-address`, `fluentd-buffer-limit`, `fluentd-retry-wait`, `fluentd-max-retries` and `fluentd-async-connect` ([#19439](https://github.com/docker/docker/pull/19439))
+ Docker learned to send log to Google Cloud via the new `gcplogs` logging driver. ([#18766](https://github.com/docker/docker/pull/18766))
+ When saving linked images together with `docker save` a subsequent `docker load` will correctly restore their parent/child relationship ([#21385](https://github.com/docker/docker/pull/21385))
*`docker info` now reports the value of cgroup KernelMemory or emits a warning if it is not supported ([#20863](https://github.com/docker/docker/pull/20863))
*`docker info` now also reports the cgroup driver in use ([#20388](https://github.com/docker/docker/pull/20388))
*`docker network inspect` will now report all endpoints whether they have an active container or not ([#21160](https://github.com/docker/docker/pull/21160))
+ Control IPv6 via explicit option when creating a network (`docker network create --ipv6`). This shows up as a new `EnableIPv6` field in `docker network inspect` ([#17513](https://github.com/docker/docker/pull/17513))
- Fix a file descriptor leak that would occur every time plugins were enumerated ([#20686](https://github.com/docker/docker/pull/20686))
- Fix an issue where Authz plugin would corrupt the payload body when faced with a large amount of data ([#20602](https://github.com/docker/docker/pull/20602))
- Fix a panic that could occur when cleanup after a container started with invalid parameters ([#21716](https://github.com/docker/docker/pull/21716))
- Fix a race with event timers stopping early ([#21692](https://github.com/docker/docker/pull/21692))
- Fix race conditions in the layer store, potentially corrupting the map and crashing the process ([#21677](https://github.com/docker/docker/pull/21677))
- Un-deprecate auto-creation of host directories for mounts. This feature was marked deprecated in ([#21666](https://github.com/docker/docker/pull/21666))
+ It is now possible for containers to share the NET and IPC namespaces when `userns` is enabled ([#21383](https://github.com/docker/docker/pull/21383))
+ `docker inspect <image-id>` will now expose the rootfs layers ([#21370](https://github.com/docker/docker/pull/21370))
+ Docker Windows gained a minimal `top` implementation ([#21354](https://github.com/docker/docker/pull/21354))
* Docker learned to report the faulty exe when a container cannot be started due to its condition ([#21345](https://github.com/docker/docker/pull/21345))
* Docker with device mapper will now refuse to run if `udev sync` is not available ([#21097](https://github.com/docker/docker/pull/21097))
- Fix a bug where Docker would not validate the config file upon configuration reload ([#21089](https://github.com/docker/docker/pull/21089))
- Fix a hang that would happen on attach if initial start was to fail ([#21048](https://github.com/docker/docker/pull/21048))
- Fix an issue where registry service options in the daemon configuration file were not properly taken into account ([#21045](https://github.com/docker/docker/pull/21045))
- Fix a race between the exec and resize operations ([#21022](https://github.com/docker/docker/pull/21022))
- Fix an issue where nanoseconds were not correctly taken in account when filtering Docker events ([#21013](https://github.com/docker/docker/pull/21013))
- Fix the handling of Docker command when passed a 64 bytes id ([#21002](https://github.com/docker/docker/pull/21002))
* Docker will now return a `204` (i.e http.StatusNoContent) code when it successfully deleted a network ([#20977](https://github.com/docker/docker/pull/20977))
- Fix a bug where the daemon would wait indefinitely in case the process it was about to killed had already exited on its own ([#20967](https://github.com/docker/docker/pull/20967)
* The devmapper driver learned the `dm.min_free_space` option. If the mapped device free space reaches the passed value, new device creation will be prohibited. ([#20786](https://github.com/docker/docker/pull/20786))
+ Docker can now prevent processes in container to gain new privileges via the `--security-opt=no-new-privileges` flag ([#20727](https://github.com/docker/docker/pull/20727))
- Starting a container with the `--device` option will now correctly resolves symlinks ([#20684](https://github.com/docker/docker/pull/20684))
+ Docker now relies on [`containerd`](https://github.com/docker/containerd) and [`runc`](https://github.com/opencontainers/runc) to spawn containers. ([#20662](https://github.com/docker/docker/pull/20662))
- Fix docker configuration reloading to only alter value present in the given config file ([#20604](https://github.com/docker/docker/pull/20604))
+ Docker now allows setting a container hostname via the `--hostname` flag when `--net=host` ([#20177](https://github.com/docker/docker/pull/20177))
+ Docker now allows executing privileged container while running with `--userns-remap` if both `--privileged` and the new `--userns=host` flag are specified ([#20111](https://github.com/docker/docker/pull/20111))
- Fix Docker not cleaning up correctly old containers upon restarting after a crash ([#19679](https://github.com/docker/docker/pull/19679))
* Docker will now error out if it doesn't recognize a configuration key within the config file ([#19517](https://github.com/docker/docker/pull/19517))
- Fix container loading, on daemon startup, when they depends on a plugin running within a container ([#19500](https://github.com/docker/docker/pull/19500))
*`docker update` learned how to change a container restart policy ([#19116](https://github.com/docker/docker/pull/19116))
*`docker inspect` now also returns a new `State` field containing the container state in a human readable way (i.e. one of `created`, `restarting`, `running`, `paused`, `exited` or `dead`)([#18966](https://github.com/docker/docker/pull/18966))
+ Docker learned to limit the number of active pids (i.e. processes) within the container via the `pids-limit` flags. NOTE: This requires `CGROUP_PIDS=y` to be in the kernel configuration. ([#18697](https://github.com/docker/docker/pull/18697))
* Object with the `pcp_pmcd_t` selinux type were given management access to `/var/lib/docker(/.*)?` ([#21370](https://github.com/docker/docker/pull/21370))
*`restart_syscall`, `copy_file_range`, `mlock2` joined the list of allowed calls in the default seccomp profile ([#21117](https://github.com/docker/docker/pull/21117), [#21262](https://github.com/docker/docker/pull/21262))
*`send`, `recv` and `x32` were added to the list of allowed syscalls and arch in the default seccomp profile ([#19432](https://github.com/docker/docker/pull/19432))
+ `docker run -v` now accepts a new flag `nocopy`. This tells the runtime not to copy the container path content into the volume (which is the default behavior) ([#21223](https://github.com/docker/docker/pull/21223))
- Fix a crash when pushing multiple images sharing the same layers to the same repository in parallel [#20831](https://github.com/docker/docker/pull/20831)
- Fix a panic when pushing images to a registry which uses a misconfigured token service [#21030](https://github.com/docker/docker/pull/21030)
It was due to the `ipc` syscall being blocked by the default seccomp profile.
- Fix user namespaces not working on Linux From Scratch [#20685](https://github.com/docker/docker/pull/20685)
- Fix issue preventing daemon to start if userns is enabled and the `subuid` or `subgid` files contain comments [#20725](https://github.com/docker/docker/pull/20725)
- Prevent systemd from deleting containers' cgroups when its configuration is reloaded [#20518](https://github.com/docker/docker/pull/20518)
- Fix SELinux issues by disregarding `--read-only` when mounting `/dev/mqueue` [#20333](https://github.com/docker/docker/pull/20333)
- Fix chown permissions used during `docker cp` when userns is used [#20446](https://github.com/docker/docker/pull/20446)
- Fix configuration loading issue with all booleans defaulting to `true` [#20471](https://github.com/docker/docker/pull/20471)
- Fix occasional panic with `docker logs -f` [#20522](https://github.com/docker/docker/pull/20522)
### Distribution
- Keep layer reference if deletion failed to avoid a badly inconsistent state [#20513](https://github.com/docker/docker/pull/20513)
- Handle gracefully a corner case when canceling migration [#20372](https://github.com/docker/docker/pull/20372)
- Fix docker import on compressed data [#20367](https://github.com/docker/docker/pull/20367)
- Fix tar-split files corruption during migration that later cause docker push and docker save to fail [#20458](https://github.com/docker/docker/pull/20458)
### Networking
- Fix daemon crash if embedded DNS is sent garbage [#20510](https://github.com/docker/docker/pull/20510)
### Volumes
- Fix issue with multiple volume references with same name [#20381](https://github.com/docker/docker/pull/20381)
### Security
- Fix potential cache corruption and delegation conflict issues [#20523](https://github.com/docker/docker/pull/20523)
* Do not stop daemon on migration hard failure [#20156](https://github.com/docker/docker/pull/20156)
- Fix various issues with migration to content-addressable images [#20058](https://github.com/docker/docker/pull/20058)
- Fix ZFS permission bug with user namespaces [#20045](https://github.com/docker/docker/pull/20045)
- Do not leak /dev/mqueue from the host to all containers, keep it container-specific [#19876](https://github.com/docker/docker/pull/19876) [#20133](https://github.com/docker/docker/pull/20133)
- Fix issue where removing a network during shutdown left Docker inoperable [#20181](https://github.com/docker/docker/issues/20181) [#20235](https://github.com/docker/docker/issues/20235)
This change is backward compatible in the API, but not on the CLI.
+ Add `--blkio-weight-device` flag to `docker run` [#13959](https://github.com/docker/docker/pull/13959)
+ Add `--device-read-bps` and `--device-write-bps` flags to `docker run` [#14466](https://github.com/docker/docker/pull/14466)
+ Add `--device-read-iops` and `--device-write-iops` flags to `docker run` [#15879](https://github.com/docker/docker/pull/15879)
+ Add `--oom-score-adj` flag to `docker run` [#16277](https://github.com/docker/docker/pull/16277)
+ Add `--detach-keys` flag to `attach`, `run`, `start` and `exec` commands to override the default key sequence that detaches from a container [#15666](https://github.com/docker/docker/pull/15666)
+ Add `--shm-size` flag to `run`, `create` and `build` to set the size of `/dev/shm` [#16168](https://github.com/docker/docker/pull/16168)
+ Show the number of running, stopped, and paused containers in `docker info` [#19249](https://github.com/docker/docker/pull/19249)
+ Show the `OSType` and `Architecture` in `docker info` [#17478](https://github.com/docker/docker/pull/17478)
+ Add `--cgroup-parent` flag on `daemon` to set cgroup parent for all containers [#19062](https://github.com/docker/docker/pull/19062)
+ Add `-L` flag to docker cp to follow symlinks [#16613](https://github.com/docker/docker/pull/16613)
+ New `status=dead` filter for `docker ps` [#17908](https://github.com/docker/docker/pull/17908)
* Change `docker run` exit codes to distinguish between runtime and application errors [#14012](https://github.com/docker/docker/pull/14012)
* Enhance `docker events --since` and `--until` to support nanoseconds and timezones [#17495](https://github.com/docker/docker/pull/17495)
* Add `--all`/`-a` flag to `stats` to include both running and stopped containers [#16742](https://github.com/docker/docker/pull/16742)
* Change the default cgroup-driver to `cgroupfs` [#17704](https://github.com/docker/docker/pull/17704)
* Emit a "tag" event when tagging an image with `build -t` [#17115](https://github.com/docker/docker/pull/17115)
* Best effort for linked containers' start order when starting the daemon [#18208](https://github.com/docker/docker/pull/18208)
* Add ability to add multiple tags on `build` [#15780](https://github.com/docker/docker/pull/15780)
* Permit `OPTIONS` request against any url, thus fixing issue with CORS [#19569](https://github.com/docker/docker/pull/19569)
- Fix the `--quiet` flag on `docker build` to actually be quiet [#17428](https://github.com/docker/docker/pull/17428)
- Fix `docker images --filter dangling=false` to now show all non-dangling images [#19326](https://github.com/docker/docker/pull/19326)
- Fix race condition causing autorestart turning off on restart [#17629](https://github.com/docker/docker/pull/17629)
- Fix obscure bug preventing to start containers [#19751](https://github.com/docker/docker/pull/19751)
- Forbid `exec` during container restart [#19722](https://github.com/docker/docker/pull/19722)
- devicemapper: Increasing `--storage-opt dm.basesize` will now increase the base device size on daemon restart [#19123](https://github.com/docker/docker/pull/19123)
### Security
+ Add `--userns-remap` flag to `daemon` to support user namespaces (previously in experimental) [#19187](https://github.com/docker/docker/pull/19187)
+ Add support for custom seccomp profiles in `--security-opt` [#17989](https://github.com/docker/docker/pull/17989)
Enabling delegation support in a specific repository will break the ability of Docker 1.9 and 1.8 to pull from that repository, if content trust is enabled.
* Allow SELinux to run in a container when using the BTRFS storage driver [#16452](https://github.com/docker/docker/pull/16452)
* Use content-addressable storage for images and layers [#17924](https://github.com/docker/docker/pull/17924)
Note that a migration is performed the first time docker is run; it can take a significant amount of time depending on the number of images and containers present.
Images no longer depend on the parent chain but contain a list of layer references.
* Add support for the new [manifest format ("schema2")](https://github.com/docker/distribution/blob/master/docs/spec/manifest-v2-2.md) [#18785](https://github.com/docker/docker/pull/18785)
* Lots of improvements for push and pull: performance++, retries on failed downloads, cancelling on client disconnect [#18353](https://github.com/docker/docker/pull/18353), [#18418](https://github.com/docker/docker/pull/18418), [#19109](https://github.com/docker/docker/pull/19109), [#18353](https://github.com/docker/docker/pull/18353)
- Fix issue where docker could hang indefinitely waiting for a nonexistent process to pull an image [#19743](https://github.com/docker/docker/pull/19743)
### Networking
+ Use DNS-based discovery instead of `/etc/hosts` [#19198](https://github.com/docker/docker/pull/19198)
+ Support for network-scoped alias using `--net-alias` on `run` and `--alias` on `network connect` [#19242](https://github.com/docker/docker/pull/19242)
+ Add `--ip` and `--ip6` on `run` and `network connect` to support custom IP addresses for a container in a network [#19001](https://github.com/docker/docker/pull/19001)
+ Add `--ipam-opt` to `network create` for passing custom IPAM options [#17316](https://github.com/docker/docker/pull/17316)
+ Add `--internal` flag to `network create` to restrict external access to and from the network [#19276](https://github.com/docker/docker/pull/19276)
+ Add `kv.path` option to `--cluster-store-opt` [#19167](https://github.com/docker/docker/pull/19167)
+ Add `discovery.heartbeat` and `discovery.ttl` options to `--cluster-store-opt` to configure discovery TTL and heartbeat timer [#18204](https://github.com/docker/docker/pull/18204)
+ Add `--format` flag to `network inspect` [#17481](https://github.com/docker/docker/pull/17481)
+ Add `--link` to `network connect` to provide a container-local alias [#19229](https://github.com/docker/docker/pull/19229)
+ Support for Capability exchange with remote IPAM plugins [#18775](https://github.com/docker/docker/pull/18775)
+ Add `--force` to `network disconnect` to force container to be disconnected from network [#19317](https://github.com/docker/docker/pull/19317)
* Support for multi-host networking using built-in overlay driver for all engine supported kernels: 3.10+ [#18775](https://github.com/docker/docker/pull/18775)
*`--link` is now supported on `docker run` for containers in user-defined network [#19229](https://github.com/docker/docker/pull/19229)
For that, please use the new MIME type `application/vnd.docker.plugins.v1.2+json` [#19549](https://github.com/docker/docker/pull/19549)
- Fix data not being copied to named volumes [#19175](https://github.com/docker/docker/pull/19175)
- Fix issues preventing volume drivers from being containerized [#19500](https://github.com/docker/docker/pull/19500)
- Fix `docker volumes ls --dangling=false` to now show all non-dangling volumes [#19671](https://github.com/docker/docker/pull/19671)
- Do not remove named volumes on container removal [#19568](https://github.com/docker/docker/pull/19568)
- Allow external volume drivers to host anonymous volumes [#19190](https://github.com/docker/docker/pull/19190)
### Builder
+ Add support for `**` in `.dockerignore` to wildcard multiple levels of directories [#17090](https://github.com/docker/docker/pull/17090)
- Fix handling of UTF-8 characters in Dockerfiles [#17055](https://github.com/docker/docker/pull/17055)
- Fix permissions problem when reading from STDIN [#19283](https://github.com/docker/docker/pull/19283)
### Client
+ Add support for overriding the API version to use via an `DOCKER_API_VERSION` environment-variable [#15964](https://github.com/docker/docker/pull/15964)
- Fix a bug preventing Windows clients to log in to Docker Hub [#19891](https://github.com/docker/docker/pull/19891)
### Misc
* systemd: Set TasksMax in addition to LimitNPROC in systemd service file [#19391](https://github.com/docker/docker/pull/19391)
### Deprecations
* Remove LXC support. The LXC driver was deprecated in Docker 1.8, and has now been removed [#17700](https://github.com/docker/docker/pull/17700)
* Remove `--exec-driver` daemon flag, because it is no longer in use [#17700](https://github.com/docker/docker/pull/17700)
* Remove old deprecated single-dashed long CLI flags (such as `-rm`; use `--rm` instead) [#17724](https://github.com/docker/docker/pull/17724)
* Deprecate HostConfig at API container start [#17799](https://github.com/docker/docker/pull/17799)
* Deprecate docker packages for newly EOL'd Linux distributions: Fedora 21 and Ubuntu 15.04 (Vivid) [#18794](https://github.com/docker/docker/pull/18794), [#18809](https://github.com/docker/docker/pull/18809)
* Deprecate `-f` flag for docker tag [#18350](https://github.com/docker/docker/pull/18350)
+ Dockerfile to use for a given `docker build` can be specified with the `-f` flag
* Dockerfile and .dockerignore files can be themselves excluded as part of the .dockerignore file, thus preventing modifications to these files invalidating ADD or COPY instructions cache
* ADD and COPY instructions accept relative paths
* Dockerfile `FROM scratch` instruction is now interpreted as a no-base specifier
* Improve performance when exposing a large number of ports
#### Hack
+ Allow client-side only integration tests for Windows
* Include docker-py integration tests against Docker daemon as part of our test suites
#### Packaging
+ Support for the new version of the registry HTTP API
* Speed up `docker push` for images with a majority of already existing layers
- Fixed contacting a private registry through a proxy
#### Remote API
+ A new endpoint will stream live container resource metrics and can be accessed with the `docker stats` command
+ Containers can be renamed using the new `rename` endpoint and the associated `docker rename` command
* Container `inspect` endpoint show the ID of `exec` commands running in this container
* Container `inspect` endpoint show the number of times Docker auto-restarted the container
* New types of event can be streamed by the `events` endpoint: ‘OOM’ (container died with out of memory), ‘exec_create’, and ‘exec_start'
- Fixed returned string fields which hold numeric characters incorrectly omitting surrounding double quotes
#### Runtime
+ Docker daemon has full IPv6 support
+ The `docker run` command can take the `--pid=host` flag to use the host PID namespace, which makes it possible for example to debug host processes using containerized debugging tools
+ The `docker run` command can take the `--read-only` flag to make the container’s root filesystem mounted as readonly, which can be used in combination with volumes to force a container’s processes to only write to locations that will be persisted
* New `COPY` Dockerfile instruction to allow copying a local file from the context into the container without ever extracting if the file is a tar file
* Inherit file permissions from the host on `ADD`
* New `pause` and `unpause` commands to allow pausing and unpausing of containers using cgroup freezer
* The `images` command has a `-f`/`--filter` option to filter the list of images
* Add `--force-rm` to clean up after a failed build
* Standardize JSON keys in Remote API to CamelCase
* Pull from a docker run now assumes `latest` tag if not specified
* Enhance security on Linux capabilities and device nodes
- devicemapper: improve handling of devicemapper devices (add per device lock, increase sleep time and unlock while sleeping).
- devicemapper: increase timeout in waitClose to 10 seconds.
- devicemapper: ensure we shut down thin pool cleanly.
- devicemapper: pass info, rather than hash to activateDeviceIfNeeded, deactivateDevice, setInitialized, deleteDevice.
- devicemapper: avoid AB-BA deadlock.
- devicemapper: make shutdown better/faster.
- improve alpha sorting in mflag.
- Remove manual http cookie management because the cookiejar is being used.
- Use BSD raw mode on Darwin. Fixes nano, tmux and others.
- Add FreeBSD support for the client.
- Merge auth package into registry.
- Add deprecation warning for -t on `docker pull`.
- Remove goroutine leak on error.
- Update parseLxcInfo to comply with new lxc1.0 format.
- Fix attach exit on darwin.
- Improve deprecation message.
- Retry to retrieve the layer metadata up to 5 times for `docker pull`.
- Only unshare the mount namespace for execin.
- Merge existing config when committing.
- 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.
- Always symlink /dev/ptmx for libcontainer. This fixes console related problems.
- Fix issue caused by the absence of /etc/apparmor.d.
- Don't leave empty cidFile behind when failing to create the container.
- Mount cgroups automatically if they're not mounted already.
- 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`.
- Fix the use of custom settings for bridges and custom bridges
- Refactor the devicemapper code to avoid many mount/unmount race conditions and failures
- Remove two panics which could make Docker crash in some situations
- Don't ping registry from the CLI client
- Enable skip_block_zeroing for devicemapper. This stops devicemapper from always zeroing entire blocks
- Fix --run in `docker commit`. This makes docker commit store `--run` in the image configuration
- Remove directory when removing devicemapper device. This cleans up leftover mount directories
- Drop NET_ADMIN capability for non-privileged containers. Unprivileged containers can't change their network configuration
- Ensure `docker cp` stream is closed properly
- Avoid extra mount/unmount during container registration. This removes an unneeded mount/unmount operation which was causing problems with devicemapper
- Stop allowing tcp:// as a default tcp bin address which binds to 127.0.0.1:4243 and remove the default port
+ Mount-bind the PTY as container console. This allows tmux and screen to run in a container
- Clean up archive closing. This fixes and improves archive handling
- Fix engine tests on systems where temp directories are symlinked
- Add test methods for save and load
- Avoid temporarily unmounting the container when restarting it. This fixes a race for devicemapper during restart
- Support submodules when building from a GitHub repository
- Quote volume path to allow spaces
- Fix remote tar ADD behavior. This fixes a regression which was causing Docker to extract tarballs
* Images and containers can be removed much faster
* Building an image from source with docker build is now much faster
* The Docker daemon starts and stops much faster
* The memory footprint of many common operations has been reduced, by streaming files instead of buffering them in memory, fixing memory leaks, and fixing various suboptimal memory allocations
* Several race conditions were fixed, making Docker more stable under very high concurrency load. This makes Docker more stable and less likely to crash and reduces the memory footprint of many common operations
* All packaging operations are now built on the Go language’s standard tar implementation, which is bundled with Docker itself. This makes packaging more portable across host distributions, and solves several issues caused by quirks and incompatibilities between different distributions of tar
* Docker can now create, remove and modify larger numbers of containers and images graciously thanks to more aggressive releasing of system resources. For example the storage driver API now allows Docker to do reference counting on mounts created by the drivers
With the ongoing changes to the networking and execution subsystems of docker testing these areas have been a focus of the refactoring. By moving these subsystems into separate packages we can test, analyze, and monitor coverage and quality of these packages
* Many components have been separated into smaller sub-packages, each with a dedicated test suite. As a result the code is better-tested, more readable and easier to change
* The ADD instruction now supports caching, which avoids unnecessarily re-uploading the same source content again and again when it hasn’t changed
* The new ONBUILD instruction adds to your image a “trigger” instruction to be executed at a later time, when the image is used as the base for another build
* Docker now ships with an experimental storage driver which uses the BTRFS filesystem for copy-on-write
+ Update ADD to use the image cache, based on a hash of the added content
* Add error message for empty Dockerfile
#### Documentation
- Fix outdated link to the "Introduction" on www.docker.io
+ Update the docs to get wider when the screen does
- Add information about needing to install LXC when using raw binaries
* Update Fedora documentation to disentangle the docker and docker.io conflict
* Add a note about using the new `-mtu` flag in several GCE zones
+ Add FrugalWare installation instructions
+ Add a more complete example of `docker run`
- Fix API documentation for creating and starting Privileged containers
- Add missing "name" parameter documentation on "/containers/create"
* Add a mention of `lxc-checkconfig` as a way to check for some of the necessary kernel configuration
- Update the 1.8 API documentation with some additions that were added to the docs for 1.7
#### Hack
- Add missing libdevmapper dependency to the packagers documentation
* Update minimum Go requirement to a hard line at Go 1.2+
* Many minor improvements to the Vagrantfile
+ Add ability to customize dockerinit search locations when compiling (to be used very sparingly only by packagers of platforms who require a nonstandard location)
+ Add coverprofile generation reporting
- Add `-a` to our Go build flags, removing the need for recompiling the stdlib manually
* Update Dockerfile to be more canonical and have less spurious warnings during build
- Fix some miscellaneous `docker pull` progress bar display issues
* Migrate more miscellaneous packages under the "pkg" folder
* Update TextMate highlighting to automatically be enabled for files named "Dockerfile"
* Reorganize syntax highlighting files under a common "contrib/syntax" directory
* Update install.sh script (https://get.docker.io/) to not fail if busybox fails to download or run at the end of the Ubuntu/Debian installation
* Add support for container names in bash completion
#### Packaging
+ Add an official Docker client binary for Darwin (Mac OS X)
* Remove empty "Vendor" string and added "License" on deb package
+ Add a stubbed version of "/etc/default/docker" in the deb package
#### Runtime
* Update layer application to extract tars in place, avoiding file churn while handling whiteouts
- Fix permissiveness of mtime comparisons in tar handling (since GNU tar and Go tar do not yet support sub-second mtime precision)
* Reimplement `docker top` in pure Go to work more consistently, and even inside Docker-in-Docker (thus removing the shell injection vulnerability present in some versions of `lxc-ps`)
+ Update `-H unix://` to work similarly to `-H tcp://` by inserting the default values for missing portions
- Fix more edge cases regarding dockerinit and deleted or replaced docker or dockerinit files
* Update container name validation to include '.'
- Fix use of a symlink or non-absolute path as the argument to `-g` to work as expected
* Update to handle external mounts outside of LXC, fixing many small mounting quirks and making future execution backends and other features simpler
* Update to use proper box-drawing characters everywhere in `docker images -tree`
* Move MTU setting from LXC configuration to directly use netlink
* Add `-S` option to external tar invocation for more efficient spare file handling
+ Add arch/os info to User-Agent string, especially for registry requests
+ Add `-mtu` option to Docker daemon for configuring MTU
- Fix `docker build` to exit with a non-zero exit code on error
+ Add `DOCKER_HOST` environment variable to configure the client `-H` flag without specifying it manually for every invocation
+ Builder: New build operation ENTRYPOINT adds an executable entry point to the container. - Runtime: Fix a bug which caused 'docker run -d' to no longer print the container ID.
