Lesson 2

Date: 5/31/2017
Linux installation and upgrade
Linux System Administration


Automatic Ubuntu Installation Overview


  • Preconfiguration file method (preseeding).

  • - Installation answers are stored in preseed.cfg file.
    - File preseed.cfg can be stored on URL, CD, HD, floppy.
    - Limitations by preseed.cfg config options.
    - Only one HD can be partitioned.


  • PXE boot; restores from archived image on an NFS server.

  • - Install OS then archive it (tar-gzip) onto NFS server.
    - PXE boot: gets IP from a DHCP, kernel and initrd from a TFTP server.
    - Partitions disks, mounts NFS, then restores the file system from the archive.
    - No need for Ubuntu mirror.
    - Needs custom initrd.
    - The OS may not be up-to-date after the installation.


  • Fully Automatic Installation (FAI)

  • - Configure the installer root on the NFS server.
    - PXE boot: gets IP from a DHCP, kernel and initrd from a TFTP server.
    - Mounts the installer root from the NFS server.
    - Very customizable installation classes.
    - The installed OS is up-to date.
    - Takes time to learn FAI.




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