查看“Fedora 16: 服务”的源代码

'''服务的启动，停止都通过systemctl来完成'''

*查看包含Network的服务
 systemctl | grep Network
得到
 sys-devi...et-eth0.device loaded active plugged       82577LC Gigabit Network Connection
 NetworkManager.service    loaded active running       Network Manager
 network.target            loaded active active        Network

*停止
 systemctl stop NetworkManager.service
*还有status，reload，start等，具体可-h

*开机启动
 systemctl enable NetworkManager.service

==service启动时间==
*systemd-analyze blame

returns a list of various services launched at boot and the time it took to launch them and do their thing in milliseconds.
 
*systemd-analyze plot > plot.svg
creates a graphic plot of the latest boot in SVG format.

*systemctl stop SERVICENAME.service and systemctl disable SERVICENAME.service
stop a running service and disable it at boot respectively.


==fedora 15的服务自动启动==
以mysqld为例
#确保/etc/rc.d/init.d/mysqld 存在，用service mysqld start能够正常启动
#运行命令：chkconfig --add mysqld
#运行命令: chkconfig --level 345 mysqld on

*启动的level含义
 0:停机
 1：单用户形式，只root进行维护
 2：多用户，不能使用net file system
 3：完全多用户
 5：图形化
 4：安全模式
 6：重启
*chkconfig的用法
  chkconfig –list [name]
  chkconfig –add name
  chkconfig –del name
  chkconfig [--level levels] name <on|off|reset>
  chkconfig [--level levels] name