How to do remote System Administration with Linux

• bash aliases Bash Aliases
  
  
• Controlling who logs in
  • look at /etc/hosts - defines hosts known to computer
  • look at /etc/hosts.deny - lock out someone
  • look at /etc/hosts.allow - enable someone
  
  
  
• looking at the system log (for clues)
  
  dmesg
  sudo tail -150 /var/log/messages | more
  
  
• ltr = ls -l -t -r # what it does
  latr = ls -l -a -t -r # what it does
  
  
• nano # simple editor
  
  
• x windows over an ssh connecton X windows over an ssh connection (Demo if time permits)
  
  
• su vs su- su vs su-
  
  
• certificate based authentication ssh certifcate based authenication (Explain but don't demo)
  
  
• Updating a system:
  
  sudo apt-get update # get update list
  sudo apt-get upgrade # apply the update list
  
  
• Can you reboot a system remotely? (yes? no? how?)

Created on ... March 27, 2011