[systemd-devel] systemd initrd

Zbigniew Jędrzejewski-Szmek zbyszek at in.waw.pl
Wed Jun 28 14:43:52 UTC 2017

On Wed, Jun 28, 2017 at 10:00:53AM -0400, Michael Di Domenico wrote:
> can anyone point me towards some howto's or documentation that shows
> how one might replace an existing busybox based initrd with a systemd
> one?

See dracut(8).


> obviously this is a bit of a loaded question as you have no idea what
> i'm doing in the initrd, but i'm not sure where to get started.  to
> break it down simply;
> with busybox, i can compile a kernel, compile busybox, add my junk to
> the init script and then make an initrd image that the kernel loads.
> at the end of the initrd if all "my junk" worked, I then switchroot to
> boot up a linux o/s
> i want to basically do the same thing with systemd, take a kernel,
> hand off to an initrd where systemd would start a shell if needed
> (like busybox does) or switchroot to boot up the o/s
> i know systemd doesn't provide all the little utils that busybox does,
> but that's okay, i can just pull them into the initrd
> i've spun myself in google circles at this point and need some
> straightening out and the system switch-root/initrd pages are a little
> to terse

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