systemd 221 发布，此版本更新内容如下：
* The sd-bus.h and sd-event.h APIs have now been declared
stable and have been added to the official interface of
libsystemd.so.
* kdbus support is no longer compile-time optional.
* The minimal required util-linux version has been bumped to
2.26.
* Support for chkconfig (--enable-chkconfig) was removed in
favor of calling an abstraction tool
/lib/systemd/systemd-sysv-install.
* If there's a systemd unit and a SysV init script for the
same service name, and the user executes "systemctl enable"
for it (or a related call), then this will now enable both
(or execute the related operation on both), not just the
unit.
* The libudev API documentation has been converted from gtkdoc
into man pages.
* gudev has been removed from the systemd tree, it is now an
external project.
* The systemd-cgtop tool learnt a new --raw switch to generate
"raw" (machine parsable) output.
* networkd's IPForwarding= .network file setting learnt the
new setting "kernel"
* The systemd-logind bus API now exposes a new boolean
property "Docked"
systemd是一个init程序。根据之前 Upstart的一些介绍大家应该简要了解了传统Sysvinit系统的不足之处。不过，这次的systemd的设计思想更为超前，也可以说是借鉴了OSX上launchd的思路。
软件详情：https://github.com/systemd/systemd/blob/master/NEWS
下载地址：http://www.freedesktop.org/software/systemd/systemd-221.tar.xz
来自:开源中国社区
