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@@ -5,6 +5,76 @@ information on the list of deprecated flags and APIs please have a look at
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https://docs.docker.com/engine/deprecated/ where target removal dates can also
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be found.
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+## 1.12.6 (2017-01-10)
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+
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+**IMPORTANT**: Docker 1.12 ships with an updated systemd unit file for rpm
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+based installs (which includes RHEL, Fedora, CentOS, and Oracle Linux 7). When
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+upgrading from an older version of docker, the upgrade process may not
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+automatically install the updated version of the unit file, or fail to start
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+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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+**NOTE**: Docker 1.12.5 will correctly validate that either an IPv6 subnet is provided or
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+that the IPAM driver can provide one when you specify the `--ipv6` option.
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+
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+If you are currently using the `--ipv6` option _without_ specifying the
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+`--fixed-cidr-v6` option, the Docker daemon will refuse to start with the
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+following message:
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+
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+```none
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+Error starting daemon: Error initializing network controller: Error creating
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+ default "bridge" network: failed to parse pool request
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+ for address space "LocalDefault" pool " subpool ":
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+ could not find an available, non-overlapping IPv6 address
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+ pool among the defaults to assign to the network
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+```
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+
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+To resolve this error, either remove the `--ipv6` flag (to preserve the same
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+behavior as in Docker 1.12.3 and earlier), or provide an IPv6 subnet as the
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+value of the `--fixed-cidr-v6` flag.
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+
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+In a similar way, if you specify the `--ipv6` flag when creating a network
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+with the default IPAM driver, without providing an IPv6 `--subnet`, network
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+creation will fail with the following message:
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+
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+```none
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+Error response from daemon: failed to parse pool request for address space
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+ "LocalDefault" pool "" subpool "": could not find an
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+ available, non-overlapping IPv6 address pool among
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+ the defaults to assign to the network
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+```
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+
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+To resolve this, either remove the `--ipv6` flag (to preserve the same behavior
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+as in Docker 1.12.3 and earlier), or provide an IPv6 subnet as the value of the
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+`--subnet` flag.
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+
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+The network network creation will instead succeed if you use an external IPAM driver
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+which supports automatic allocation of IPv6 subnets.
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+
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+### Runtime
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+
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+- Fix runC privilege escalation (CVE-2016-9962)
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+
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## 1.12.5 (2016-12-15)
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**IMPORTANT**: Docker 1.12 ships with an updated systemd unit file for rpm
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