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Sometimes when I chroot into some folder , I could use reboot to reset my box, but sometimes I can't.

So I want to know why I could do that sometimes and why.

UPDATE

The chroot environment is another Linux system installed on a different partition and I prepare the chroot as follows:

mount --bind /dev chroot/dev
mount --bind /sys chroot/sys
mount -t proc proc chroot/proc
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Are we really expected to know what your chroot environment looks like? – Ignacio Vazquez-Abrams May 14 '12 at 6:07
I second the request for more information. How exactly do you enter the chroot? What sequence of commands do you use? – rozcietrzewiacz May 14 '12 at 6:37
updated , please check – warl0ck May 14 '12 at 6:39
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So in which cases were you NOT able to reboot? What was different? – Nils May 14 '12 at 21:18

1 Answer

up vote 6 down vote accepted

It's /dev/initctl, which is (often? always?) used to interact with init (pid 0), e.g. Upstart.

From your updated chroot entrance sequence, you bound /dev/, so there is a /dev/initctl in your chroot. Triggering a reboot can this way reboot your system.

This probably won't be this way much longer, as many distributions (e.g. Debian) introduce /run/, where initctl then resides.

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