systemd 是Linux下一个与SysV和LSB init scripts兼容的系统和服务管理器。systemd 使用socket和D-Bus来开启服务，提供基于守护进程的按需启动策略，保留了Linux cgroups的进程追踪功能，支持快照和系统状态恢复，维护挂载和自挂载点，实现了各服务间基于从属关系的一个更为精细的逻辑控制，拥有前卫的并行性能。它也可以降级作为sysvinit的一个替代品。更多信息，请参考视频：http://linuxconfau.blip.tv/file/4696791/ 和 http://www.youtube.com/watch?v=TyMLi8QF6sw
为什么是systemd？
http://0pointer.de/blog/projects/why.html
介绍
systemd文档
systemd特性
工具
内核启动命令行
Fedora中systemd的开发状态
System V init与systemd的对接
systemd的服务管理程序
如何启动/关闭、开启/禁止服务？
如何改变运行级别？
如何改变默认运行级别？
如何查看当下运行级别？
如何关机？
service命令兼容systemd吗？
chkconfig命令兼容systemd吗？
system-config-services与systemd兼容吗？
如何改变默认gettys号？
虚拟终端如何设置自动登录？
如何自定义或增加一个自定义unit文件？
unit文件在/etc/systemd/system下的优先级要高于/lib/systemd/system下的。按照个人的需求从后者移动道前者并进行自定义修改。
If a line starts with .include followed by a file name, the specified file will be parsed at this point. Make sure that the file that is included has the appropiate section headers before any directives.
You should use .include statement instead of copying the whole unit file from /lib/systemd/system to /etc/systemd/system if possible. This will enable to update the unchanged directives correctly during future package updates.
Be careful when using .include together with directives that can be defined multiple times (like EnvironmentFile=), since we can only add new directives, but we can't remove already defined ones. We have to copy the whole file from /lib/systemd/system to /etc/systemd/system in this case.
Let's say we use a lighttpd server and we want to lower its niceness value. All we need to do is to add Nice=-5 to the lighttpd.service file. We can do this by either copying the whole file from /lib/systemd/system/lighttpd.service to /etc/systemd/system/lighttpd.service or creating the following file in /etc/systemd/system/lighttpd.service:
如何调试系统事件？
预读功能
关于/usr分区的警告
详细参考： http://freedesktop.org/wiki/Software/systemd/separate-usr-is-broken 和 http://cgit.freedesktop.org/systemd/tree/README for details.
man手册页
systemd 有多方面的文档，其中也包括一些man手册页。其网页版地址是： http://0pointer.de/public/systemd-man/
参考
- http://0pointer.de/blog/projects/ - Lennart's blog has lots of information about systemd. Lennart is the primary systemd developer
- http://www.freedesktop.org/wiki/Software/systemd/FrequentlyAskedQuestions
- http://www.freedesktop.org/wiki/Software/systemd/TipsAndTricks
- Features Fedora 15:systemd
- Project homepage
- Interview with the developer
- cgroups