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Thread: PXE boot into RAM

  1. #1
    Join Date
    Sep 2021
    Beans
    2

    PXE boot into RAM

    I'm trying to setup a bunch of servers to pxe boot Ubuntu fully into RAM (No hard drives), and run software fully in memory. I'm following the instructions here: https://itectec.com/ubuntu/ubuntu-au...-server-image/. So far my ipxe boot process works fine, and loads onto a server without a hard disk, but it just boots to the Installer screen (where it asks to select language, network settings etc...).

    My current ipxe boot file looks like this:
    Code:
    #!ipxe
    
    set base http://192.168.1.142/tftp
    
    kernel ${base}/vmlinuz initrd=initrd.img url=http://192.168.1.142/tftp/ubuntu-20.04-live-server-amd64.iso autoinstall ds="nocloud-net;s=http://192.168.1.142/tftp/" root=/dev/ram0 cloud-config-url=/dev/null ip=dhcp
    initrd ${base}/initrd
    boot
    I just have a few basic questions that someone familiar with Ubuntu could probably answer:

    1. Is it possible to ipxe boot Ubuntu fully into RAM using the ubuntu-20.04-live-server-amd64.iso image, or do I need to create a custom iso somehow?
    2. I've come across cloud images at: https://cloud-images.ubuntu.com/focal/current/ , but just a bit confused on how I could boot these in a private cloud. Is there any documentation or example ipxe files?
    3. Is cloud-init compatible with booting a server fully into ram and configuring it in RAM?

  2. #2
    Join Date
    Jun 2010
    Location
    London, England
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: PXE boot into RAM

    My understanding (which is very limited) of Preboot Execution Environment (PXE) that it allows installation of an operating system over a network. I think it makes it possible for an IT administrator to install or re-install an OS without being physically present using the target machine. I may be wrong about this. So, I do not think that PXE is meant for installing an OS onto a machine without some kind of storage device.

    It is possible to run an OS in a RAM disc but I guess that some storage would be needed to hold and run the initial part of the OS that needs to load to create the RAM disc from which the OS runs from. If you get my meaning.

    https://askubuntu.com/questions/1212...-optionally-on

    Without any on machine storage it seems to me that the machine would become a dumb terminal running an OS on another machine over the network. Which is where computing was before IBM invented the Personal Computer.

    Regards
    Last edited by grahammechanical; September 4th, 2021 at 02:00 AM.
    It is a machine. It is more stupid than we are. It will not stop us from doing stupid things.
    Ubuntu user #33,200. Linux user #530,530


  3. #3
    Join Date
    Apr 2014
    Beans
    800

    Re: PXE boot into RAM

    Go to https://ltsp.org/

    This automates damn near the whole process. I gave up trying to piece it together myself long time ago and found this. It works quite well, even full desktops. Is just a bunch of shell scripts and some python so you can look at them if you wish to see how it works.
    Last edited by Tadaen_Sylvermane; September 3rd, 2021 at 11:58 PM.

  4. #4
    Join Date
    Sep 2021
    Beans
    2

    Re: PXE boot into RAM

    Thanks. Tadaen. Looks interesting. I'll check it out over the weekend.

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