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How to Run Custom Linux Images on Oracle Free Tier (roguesecurity.dev)

submitted 1 day ago by starkzarn to c/selfhosted@lemmy.world

14 comments fedilink hide all child comments

Decided to write up a quick post on a hacky workaround I came up with for custom distros Oracle free tier and thought I'd share. Don't rely on Oracle, but definitely do leverage as much of their free compute as you can for non-critical workloads!

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[–] InnerScientist@lemmy.world 2 points 22 hours ago (5 children)

Can't you just kexec and be on your way?

[–] starkzarn 3 points 21 hours ago (4 children)

I am not well versed with kexec but I always understood it to be a kernel reboot without power cycling the "metal." Please enlighten us with an example! I don't see how you'd replace the entire userspace (and possibly filesystem) with simply kexec.

[–] InnerScientist@lemmy.world 3 points 20 hours ago (3 children)

Kexec can be used to load a new kernel and "reboot" quickly, it can also be used to load a new kernel, an initrd and never touch the disk. Such a system lives completely in ram and allows you to modify the disk in any way you want without breaking you running Linux (which is in ram)

Any distro that has a network boot installer that can be passed to kexec can be installed this way, any that don't can still kexec any Linux distro and then install any other distro by passing the disk to a VM and installing linux through that.

You can also kexec the netboot.xyz image and get any distro supported there.

[–] starkzarn 2 points 18 hours ago (1 children)

The "gotcha" with Oracle free tier is that you can't install from arbitrary media, so the typical netboot.xyz or any iPXE workflow is out. No console access, no pre-bootloader access, nothing.

I've been fiddling with kexec, but it doesn't seem like a supported method of loading the lkrn file from netboot...

This is super interesting to me, so by all means, if you have the kung-fu to show how this works I would happily read through that!

[–] InnerScientist@lemmy.world 3 points 16 hours ago* (last edited 15 hours ago) (1 children)

Yeah I tried just now and it diesn't seem to be working (anymore?) could've sworn that worked.

You can still kexec the installiers directly, I followed the netboot.xyz scripts and got the links they use. Here's Debian as an example:

From the scripts: https://deb.debian.org/debian/dists/stable/main/installer-amd64/current/images/netboot/ looking at the boot config debian-installer/amd64/grub/grub.cfg

submenu '... KDE Plasma desktop boot menu ...' {
    set gfxpayload=keep
    menuentry '... Install' {
        set background_color=black
        linux    /debian-installer/amd64/linux desktop=kde vga=788
***
quiet
        initrd   /debian-installer/amd64/initrd.gz

so we need to download those two files and take the netboot.xyz cmdline arguments then

$ kexec --command-line="desktop=kde vga=788 mirror/suite=stable initrd=initrd.magic console=ttyS0,115200n8"  --initrd=initrd.gz -l linux´
$ systemctl kexec

and it boots.

also here's an example for the nixos netboot commands, more on that in the nixos manual:

$ kexec --load bzImage \
  --initrd=initrd.gz \
  --command-line "init=/nix/store/n37nmcvbrblk9ahfzj9nxy01axs7zsf6-nixos-system-nixos-kexec-25.11pre-git/init nohibernate loglevel=4 lsm=landlock,yama,bpf"
$ systemctl kexec

Edit:

No console access

If that means that you can only connect to SSH and have no VGA/video then this will be limited, you could setup an automated install but that requires a lot more knowledge than what your guide requires.

[–] starkzarn 2 points 12 hours ago

Okay this is excellent content, thank you!

I went through and fiddled with some more stuff to try and get this working to no avail. However, it inspired me to take apart netboot.xyz a bit more, and I was able to grab an efi and get next boot to load the efi file. It took me too long to realize you need the console tty arguments as part of the boot cmdline to get it working interactively, but after I got there I got it netbooted. Sadly though, it almost immediately runs into an OOM condition and thus isn't practical on a free tier x86 asset. It would probably work on an aarch64 node, but I already have my allotted arm node spun up and working so I don't have a free one to practice with.

Solid write-up though, thank you for putting that together!

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