learn how to setup , use nagios
http://nagios.sourceforge.net/docs/3_0/quickstart.html
today, I setup my nagios
attention:
1.configure file
2.apache
httpd-ssh.conf
use httpd-ssh to reliaze ssh
sudo
http://wiki.ubuntu.org.cn/Quick_HOWTO_:_Ch09_:_Linux_Users_and_Sudo/zh
ssh
http://support.suso.com/supki/SSH_Tutorial_for_Linux