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+# Release 14.12 ("Caterpillar", 2014/12/30) {#sec-release-14.12}
+
+In addition to numerous new and upgraded packages, this release has the following highlights:
+
+- Systemd has been updated to version 217, which has numerous [improvements.](http://lists.freedesktop.org/archives/systemd-devel/2014-October/024662.html)
+
+- [Nix has been updated to 1.8.](https://www.mail-archive.com/nix-dev@lists.science.uu.nl/msg13957.html)
+
+- NixOS is now based on Glibc 2.20.
+
+- KDE has been updated to 4.14.
+
+- The default Linux kernel has been updated to 3.14.
+
+- If `users.mutableUsers` is enabled (the default), changes made to the declaration of a user or group will be correctly realised when running `nixos-rebuild`. For instance, removing a user specification from `configuration.nix` will cause the actual user account to be deleted. If `users.mutableUsers` is disabled, it is no longer necessary to specify UIDs or GIDs; if omitted, they are allocated dynamically.
+
+Following new services were added since the last release:
+
+- `atftpd`
+
+- `bosun`
+
+- `bspwm`
+
+- `chronos`
+
+- `collectd`
+
+- `consul`
+
+- `cpuminer-cryptonight`
+
+- `crashplan`
+
+- `dnscrypt-proxy`
+
+- `docker-registry`
+
+- `docker`
+
+- `etcd`
+
+- `fail2ban`
+
+- `fcgiwrap`
+
+- `fleet`
+
+- `fluxbox`
+
+- `gdm`
+
+- `geoclue2`
+
+- `gitlab`
+
+- `gitolite`
+
+- `gnome3.gnome-documents`
+
+- `gnome3.gnome-online-miners`
+
+- `gnome3.gvfs`
+
+- `gnome3.seahorse`
+
+- `hbase`
+
+- `i2pd`
+
+- `influxdb`
+
+- `kubernetes`
+
+- `liquidsoap`
+
+- `lxc`
+
+- `mailpile`
+
+- `mesos`
+
+- `mlmmj`
+
+- `monetdb`
+
+- `mopidy`
+
+- `neo4j`
+
+- `nsd`
+
+- `openntpd`
+
+- `opentsdb`
+
+- `openvswitch`
+
+- `parallels-guest`
+
+- `peerflix`
+
+- `phd`
+
+- `polipo`
+
+- `prosody`
+
+- `radicale`
+
+- `redmine`
+
+- `riemann`
+
+- `scollector`
+
+- `seeks`
+
+- `siproxd`
+
+- `strongswan`
+
+- `tcsd`
+
+- `teamspeak3`
+
+- `thermald`
+
+- `torque/mrom`
+
+- `torque/server`
+
+- `uhub`
+
+- `unifi`
+
+- `znc`
+
+- `zookeeper`
+
+When upgrading from a previous release, please be aware of the following incompatible changes:
+
+- The default version of Apache httpd is now 2.4. If you use the `extraConfig` option to pass literal Apache configuration text, you may need to update it --- see [Apache's documentation](http://httpd.apache.org/docs/2.4/upgrading.html) for details. If you wish to continue to use httpd 2.2, add the following line to your NixOS configuration:
+
+  ```nix
+  {
+    services.httpd.package = pkgs.apacheHttpd_2_2;
+  }
+  ```
+
+- PHP 5.3 has been removed because it is no longer supported by the PHP project. A [migration guide](http://php.net/migration54) is available.
+
+- The host side of a container virtual Ethernet pair is now called `ve-container-name` rather than `c-container-name`.
+
+- GNOME 3.10 support has been dropped. The default GNOME version is now 3.12.
+
+- VirtualBox has been upgraded to 4.3.20 release. Users may be required to run `rm -rf /tmp/.vbox*`. The line `imports = [ <nixpkgs/nixos/modules/programs/virtualbox.nix> ]` is no longer necessary, use `services.virtualboxHost.enable = true` instead.
+
+  Also, hardening mode is now enabled by default, which means that unless you want to use USB support, you no longer need to be a member of the `vboxusers` group.
+
+- Chromium has been updated to 39.0.2171.65. `enablePepperPDF` is now enabled by default. `chromium*Wrapper` packages no longer exist, because upstream removed NSAPI support. `chromium-stable` has been renamed to `chromium`.
+
+- Python packaging documentation is now part of nixpkgs manual. To override the python packages available to a custom python you now use `pkgs.pythonFull.buildEnv.override` instead of `pkgs.pythonFull.override`.
+
+- `boot.resumeDevice = "8:6"` is no longer supported. Most users will want to leave it undefined, which takes the swap partitions automatically. There is an evaluation assertion to ensure that the string starts with a slash.
+
+- The system-wide default timezone for NixOS installations changed from `CET` to `UTC`. To choose a different timezone for your system, configure `time.timeZone` in `configuration.nix`. A fairly complete list of possible values for that setting is available at <https://en.wikipedia.org/wiki/List_of_tz_database_time_zones>.
+
+- GNU screen has been updated to 4.2.1, which breaks the ability to connect to sessions created by older versions of screen.
+
+- The Intel GPU driver was updated to the 3.x prerelease version (used by most distributions) and supports DRI3 now.