????????????
????1??????root??????????????????????sudo????????
????2?????????????????SSH??????????root?????????????????????????????IP??
????3???????????·?????????????????????????
????4??????yum??????????????????????????
????5?????seLinux??iptables????????????У????????IP??????
????6????????????????????????????????????????????????????
????7?????????????????????????????inodes??????
?????????Centos6??Centos5???????????
????8??????????????????????????crond??sshd??network??rsyslog??sysstat??
????9??Linux?????????/etc/sysctl.conf??  ???sysctl -p??Ч??
????10???????????????????????????黹?????????????????????????
????11?????????????磨/etc/passwd /tec/shadow /etc/group  /etc/????  /etc/inittab)??????????????chattr??lsattr?????oldboy?????Щ??
????12?????/etc/issue  ??/etc/issue.net??   ??????????汾?????????
????13???????????????
????14???grub?????????
????15???????PING??
????16??????????????