@vieux vieux released this Oct 27, 2016 · 124 commits to 1.12.x since this release

Assets 2

1.12.3 (2016-10-26)

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.


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
  • 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.


  • Fix ambient capability usage in containers (CVE-2016-8867) #27610
  • Prevent a deadlock in libcontainerd for Windows #27136
  • Fix error reporting in CopyFileWithTar #27075
  • Reset health status to starting when a container is restarted #27387
  • Properly handle shared mount propagation in storage directory #27609
  • Fix docker exec #27610
  • Fix backward compatibility with containerd’s events log #27693

Swarm Mode



  • Update fluent-logger-golang to v1.2.1 #27474


  • Update buildtags for armhf ubuntu-trusty #27327
  • Add AppArmor to runc buildtags for armhf #27421



deb/rpm install: curl -fsSL https://get.docker.com/ | sh
Linux 64bits tgz: https://get.docker.com/builds/Linux/x86_64/docker-1.12.3.tgz
Darwin/OSX 64bits client tgz: https://get.docker.com/builds/Darwin/x86_64/docker-1.12.3.tgz
Linux 32bits arm tgz: https://get.docker.com/builds/Linux/armel/docker-1.12.3.tgz
Windows 64bits zip: https://get.docker.com/builds/Windows/x86_64/docker-1.12.3.zip
Windows 32bits client zip: https://get.docker.com/builds/Windows/i386/docker-1.12.3.zip

With experimental features

deb/rpm install: curl -fsSL https://experimental.docker.com/ | sh
Linux 64bits tgz: https://experimental.docker.com/builds/Linux/x86_64/docker-1.12.3.tgz
Darwin/OSX 64bits client tgz: https://experimental.docker.com/builds/Darwin/x86_64/docker-1.12.3.tgz
Linux 32bits arm tgz: https://experimental.docker.com/builds/Linux/armel/docker-1.12.3.tgz
Windows 64bits zip: https://experimental.docker.com/builds/Windows/x86_64/docker-1.12.3.zip
Windows 32bits client zip: https://experimental.docker.com/builds/Windows/i386/docker-1.12.3.zip