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I have used an aufs root before on gentoo years ago, but cannot seem to get it going now. I am using genkernel-next, I would imagine I used genkernel before as well.

I am using funtoo with aufs-sources and have aufs built-into the kernel (not a module). I believe I need to make some initramfs changes + command-line and /etc/fstab changes as well, but can't seem to figure out exactly what.

Any ideas?

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  • Read this Gentoo Wiki, and substitute the aufs-sources for the hardened sources entry
    – eyoung100
    Commented Jul 1, 2015 at 18:42
  • Thanks, I came across the article, but it does nothing to tackle an aufs root, just being able to support aufs.
    – Walter
    Commented Jul 1, 2015 at 23:07
  • After installing the tools as per the article, I would replace or modify my root entry in fstab
    – eyoung100
    Commented Jul 1, 2015 at 23:15
  • I believe there was a parameter you needed to pass on the kernel command-line to active an init script to setup an aufs root. I'll have to look at the initramfs to see if that is the case.
    – Walter
    Commented Jul 2, 2015 at 1:39
  • Ah, I expanded out my initramfs and see hooks for aufs. I will post back what I find. What I'm saying is is that the documentation is not very thorough or up-to-date for an aufs root. Of course being that it is gentoo, there are probably 1000 different ways to do it.
    – Walter
    Commented Jul 2, 2015 at 1:46

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I figured it out, actually, the easiest way was to simply modify the linuxrc script with exactly I wanted to do. In that case, I added support for both aufs and overlayfs, but have opted for overlayfs since it doesn't require a special kernel patchset which would be convenient if I want to use this method / approach on other distributions. I modified my linuxrc to support loading the squashfs image into tmpfs, using a tmpfs rw volume, and using a volume you specify for rw. The later is really nice because you can isolate any changes you've made and either clear them out and reboot or simply reboot to a tmpfs volume to "refresh" the slate.

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