What can I say, I didn't want to wait on my provider lol
What can I say, I didn't want to wait on my provider lol
It was also actually pretty fun!
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46 comments
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Impressive, sounds like magic, tbh! You know any tutorials?
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Not really, I pulled it together from a bunch of random posts lol
Maybe I should write one, but in essence you:
- Stop all non-OS essential services
- Create a filesystem in a chunk of RAM
- Pull essential OS files from the installed OS into it recreating needed directories (Though you could probably just use a tiny pre-built distro but meh)
- Pivot root into it
- Reload services (when they restart they'll be restarted in the context of where you pivot rooted, prior they're still running under the context of the installed OS)
- Unmount the boot drive
- Then do what ever you need to do
- ???
- Profit
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How exactly so you pivot root? Simply chroot or something more involved?
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chroot isn't enough, you need "real" pivot_root
chroot just changes the shells root point, pivot_root actually changes the root mount point and enables this trick to work
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This is god-tier technique, kudos
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Holy fuck
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The man page has a good example.
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I work in this field and I think this is 🔥 af
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FYI you can use kexec and a prepared initrd to do something similar with only one command.
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Imagining this process, despite having never done 50% of the steps on the list, makes my brain imagine this:
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Yeah, I'd love to see a write up on this to follow.Sounds like useful practice in the lab if nothing else.
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i experimented with this some time ago, see my post here: https://lemmy.ml/post/18706002/12772832
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46 comments