The container's root filesystem is mounted by the host system, not the guest — and therefore root fs will not appear in <code>/etc/mtab</code>. It will lead to a non-working <code>df</code> command. To fix, link /etc/mtab to /proc/mounts.

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After replacing <code>/etc/mtab</code> with a symlink to <code>/proc/mounts</code>, you will always have up-to-date information of what is mounted in <code>/etc/mtab</code>.