chkconfig --list 查看Linux启动项，启动 3:on 或 5:on 为默认启动项，例如：
[root@localhost ~]# chkconfig --list abrt-ccpp 0:off 1:off 2:off 3:off 4:off 5:off 6:off abrtd 0:off 1:off 2:off 3:off 4:off 5:off 6:off acpid 0:off 1:off 2:off 3:off 4:off 5:off 6:off aegis 0:off 1:off 2:on 3:on 4:on 5:on 6:off atd 0:off 1:off 2:off 3:off 4:off 5:off 6:off auditd 0:off 1:off 2:off 3:off 4:off 5:off 6:off blk-availability 0:off 1:on 2:off 3:off 4:off 5:off 6:off cpuspeed 0:off 1:on 2:off 3:off 4:off 5:off 6:off crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off gshelld 0:off 1:off 2:on 3:on 4:on 5:on 6:off haldaemon 0:off 1:off 2:off 3:off 4:off 5:off 6:off htcacheclean 0:off 1:off 2:off 3:off 4:off 5:off 6:off httpd 0:off 1:off 2:off 3:off 4:off 5:off 6:off ip6tables 0:off 1:off 2:off 3:off 4:off 5:off 6:off iptables 0:off 1:off 2:off 3:off 4:off 5:off 6:off irqbalance 0:off 1:off 2:off 3:off 4:off 5:off 6:off jexec 0:off 1:on 2:on 3:on 4:on 5:on 6:off kdump 0:off 1:off 2:off 3:off 4:off 5:off 6:off lvm2-monitor 0:off 1:on 2:off 3:off 4:off 5:off 6:off mdmonitor 0:off 1:off 2:off 3:off 4:off 5:off 6:off messagebus 0:off 1:off 2:off 3:off 4:off 5:off 6:off mysqld 0:off 1:off 2:on 3:on 4:on 5:on 6:off netconsole 0:off 1:off 2:off 3:off 4:off 5:off 6:off netfs 0:off 1:off 2:off 3:off 4:off 5:off 6:off network 0:off 1:off 2:on 3:on 4:on 5:on 6:off nginx 0:off 1:off 2:on 3:on 4:on 5:on 6:off nscd 0:off 1:off 2:on 3:on 4:on 5:on 6:off ntpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off ntpdate 0:off 1:off 2:off 3:off 4:off 5:off 6:off postfix 0:off 1:off 2:off 3:off 4:off 5:off 6:off psacct 0:off 1:off 2:off 3:off 4:off 5:off 6:off quota_nld 0:off 1:off 2:off 3:off 4:off 5:off 6:off rdisc 0:off 1:off 2:off 3:off 4:off 5:off 6:off restorecond 0:off 1:off 2:off 3:off 4:off 5:off 6:off rngd 0:off 1:off 2:off 3:off 4:off 5:off 6:off rsyslog 0:off 1:off 2:on 3:on 4:on 5:on 6:off saslauthd 0:off 1:off 2:off 3:off 4:off 5:off 6:off smartd 0:off 1:off 2:off 3:off 4:off 5:off 6:off sshd 0:off 1:off 2:on 3:on 4:on 5:on 6:off svnserve 0:off 1:off 2:off 3:off 4:off 5:off 6:off sysstat 0:off 1:on 2:on 3:on 4:on 5:on 6:off udev-post 0:off 1:on 2:on 3:on 4:on 5:on 6:off vsftpd 0:off 1:off 2:on 3:on 4:on 5:on 6:off
关闭默认启动项命令： chkconfig servicename off
打开默认启动项命令： chkconfig servicename on
重启命令如下：
1、reboot 2、shutdown -r now 立刻重启(root用户使用) 3、shutdown -r 10 过10分钟自动重启(root用户使用) 4、shutdown -r 20:35 在时间为20:35时候重启(root用户使用)
关机命令如下：
1、halt 立刻关机 2、poweroff 立刻关机 3、shutdown -h now 立刻关机(root用户使用) 4、shutdown -h 10 10分钟后自动关机
