CentOS7之前的版本是通过/etc/inittab文件来定义系统运行级别: [sywu@wusuyuan]$cat/etc/centos-releaseCentOSrelease6.4(Final)[sywu@wusuyuan]$cat/etc/inittabinittabisonlyusedbyupstartforthedefaultrunlevel.ADDINGOTHERCONFIGURATIONHEREWILLHAVENOEFFECTONYOURSYSTEM.Systeminitializationisstartedby/etc/init/rcS.confIndividualr...