线上服务器建议开启的服务
crond / network / syslog / sshd / iptables / udev-post / sysstat
快捷开启方式，先关闭所有服务
for serv in `chkconfig --list|grep 3:on|awk '{print $1}'`;do chkconfig --level 3 $serv off;done
for serv in `crond network syslog sshd iptables udev-post sysstat`;do chkconfig --level 3 $serv on;done
可删除的系统用户和组
查看用户组
vipw
删除不必要的用户
userdel adm
userdel lp
userdel sync
userdel shutdown
userdel halt
userdel news
userdel uucp
userdel video
userdel games
userdel gopher
userdel ftp
删除不必要的群组
groupdel adm
groupdel lp
groupdel news
groupdel uucp
groupdel games
groupdel dip
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