ubuntu tips

Ubuntu Server Settings

• pppoe: sudo pppoeconf
  
• Network Time Protocol: sudo apt-get install ntp
• How-To: Manage services with "update-rc.d"
  sudo update-rc.d _service_name_ defaults 99
  
• Internet Connection Sharing: dnsmasq(dns+dhcpd) + Firewall(ufw)
  sudo ufw allow 22
  sudo ufw allow 80
  sudo ufw allow from 10.1.1.0/24
  # to enable DHCPD on eth0:
  sudo ufw allow in on eth0 from any port 68 to any port 67 proto udp
  check also "ufw Masquerading"
  
• Firewall (ufw) setting for vsftpd:
  sudo ufw allow ftp
  sudo ufw allow 20/tcp
  
• DynDNS
• gitosis: step to restore git repositories
  
  • restore ssh keys to /etc/ssh
  • restore git directory to /home/git
  • chown -Rf git:git git
    

• grub2 configuration file: /etc/default/grub
• sudo update-grub # to update modified grub2 configuration file
• sudo grub-install /dev/sda # re-install grub to MBA of /dev/sda
• grub2: hold SHIFT to select kernel to boot (GRUB_HIDDEN_TIMEOUT=0)
• Clean Up the New Ubuntu Grub2 Boot Menu
• Change timezone of ubuntu machine from command line: dpkg-reconfigure tzdata
• HP LaserJet setup: hp-setup (hp-setup, hplip-cups)
• Find which Debian or ubuntu Linux Version you are running
cat /etc/issue
• Show the List of Installed Packages on Ubuntu or Debian
  dpkg --get-selections
  dpkg -L
• search for a filename  from  installed  packages.
  dpkg-query -S /etc/bash_completion
  bash-completion: /etc/bash_completion