如何重起,停止,启动httpd服务?
/etc/init.d/xxx start | stop | restart
/etc/init.d/httpd reload
优点: 不必找出进程的 PID
/etc/init.d/httpd restart
关闭然后重新打开
在/etc下面有很多诸如rc?.d的目录,里面有很多符号链接。在这儿,?是指运行级对应的数字和 rcsysinit.d。在这些目录下都会有符号链接文件,它们的名字都是以K或S开头,后面跟有三个数字:000-999。K意味着停止(Kill)一个服务。S意味着开始(Start)一个服务,数字标志着启动过程中的运行顺序,越小的数字在启动过程中越早的执行。当initbiah转换到其他运行级别时,一些相应的服务会被停止,而另一些服务则会开始。
实际上所有的脚本都在 /etc/init.d 中。它们完成了全部的工作,所有的符号链接都指向它们。停止(killing)的连接和启动(starting)连接指向 /etc/init.d 下的同一个脚本。这是因为调用这些脚本时可以使用不同的参数(例如停止-Stop、开始-Start、重载-Reload、显示当前状态-Status),当一个K连接被使用时,相应地使用Stop参数;S连接被使用时,相应地使用Start参数。
有一个例外。在rc0.d和rc6.d目录中的S链接不会开始任何服务。它们会用stop参数调用,来停止某些服务。这背后的逻辑是,当你准备关机或重启的时候,你不会想开始什么服务,只会停止它们。
下面是脚本的参数:
start: 开始服务。
stop: 停止服务。
restart: 先停止,再开始服务。
reload: 服务的配置更新了。在改变了服务的配置文件后,如果服务不用被重新开始,要用这个参数。
status: 告诉用户,这个服务是否在运行,如果在运行,还会给出PID。

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