chroot into an off-line Linux version using a LiveCD/USB

It's not just as simple as running the chroot command, you need to ensure the /proc and /dev entries are passed through and populated to the chroot environment.

Step 1 - Mount Your Off-line OS

mount /dev/sda1 /mnt

Step 2 - Mount Proc

mount -t proc none /mnt/proc

Step 3 - Mount Dev

Most guides will tell you to use this: mount -o bind /dev /mnt//dev but that doesn't work for some reason in many cases:

mount: wrong fs type, bad option, bad superblock on /dev,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

So the work around is to use the following (unless the above works for you, I believe maybe newer versions of mount will be fine):

cp -a /dev /mnt/dev-temp

mount --bind /mnt/dev-temp/ /mnt/dev

Chroot in!

Everything should be fine, I can see my disks and everything functions as normal.  The bad part/side effect is the fact that for some reason I can't see my mdadm entries.


Tags:

chroot, linux, livecd, usbit, ensure, proc, dev, entries, populated, mount, os, sda, mnt, guides, bind, doesn, fs, superblock, codepage, info, syslog, dmesg, newer, versions, cp, temp, disks, functions, mdadm,

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