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@@ -7,6 +7,36 @@ be found.
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## 1.12.0 (2016-07-14)
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+
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+**IMPORTANT**:
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+
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+Docker 1.12.0 ships with an updated systemd unit file for rpm based installs
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+(which includes RHEL, Fedora, CentOS, and Oracle Linux 7). When upgrading from
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+an older version of docker, the upgrade process may not automatically install
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+the updated version of the unit file, or fail to start the docker service if;
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+
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+- the systemd unit file (`/usr/lib/systemd/system/docker.service`) contains local changes, or
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+- a systemd drop-in file is present, and contains `-H fd://` in the `ExecStart` directive
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+
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+Starting the docker service will produce an error:
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+
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+ Failed to start docker.service: Unit docker.socket failed to load: No such file or directory.
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+
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+or
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+
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+ no sockets found via socket activation: make sure the service was started by systemd.
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+
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+To resolve this:
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+
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+- Backup the current version of the unit file, and replace the file with the
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+ version that ships with docker 1.12 (https://raw.githubusercontent.com/docker/docker/v1.12.0/contrib/init/systemd/docker.service.rpm)
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+- Remove the `Requires=docker.socket` directive from the `/usr/lib/systemd/system/docker.service` file if present
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+- Remove `-H fd://` from the `ExecStart` directive (both in the main unit file, and in any drop-in files present).
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+
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+After making those changes, run `sudo systemctl daemon-reload`, and `sudo
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+systemctl restart docker` to reload changes and (re)start the docker daemon.
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+
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+
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### Builder
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+ New `HEALTHCHECK` Dockerfile instruction to support user-defined healthchecks [#23218](https://github.com/docker/docker/pull/23218)
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Brian Goff