On Jul 12, 2005, at 9:48 AM, Joerg Schilling wrote:
It's been some time since I was last familiar with this stuff.
Am I correct in saying that /lib (as distinct to /usr/lib)
contains libraries that may be needed during recovery operations
(eg, when /usr is unavailable)? I think that is correct,
and explains the demise of the old static binaries
in /usr/sbin/static.
Anyway, an ldd on /usr/bin/bash shows that it requires nothing
outside of /lib (ie nothing in /usr). So my guess would be
that simply copying /usr/bin/bash to /sbin would make it
available to you in times of emergency (ie when only /
is mounted, perhaps ro).
This does not help ud /usr is not mounted in single user emergency
mode.
/bin is a symlink to /usr/bin and when /usr is not mounted, then
there is no /bin/ksh -> the bourne shell dies from the exec above.
In high end server environments, particularly those that run Veritas
Volume Manager, /usr should be part of /.
<http://www.sun.com/blueprints/0500/vxvmstorge.pdf>
Read the section of this Blueprint as to the whys. In my experience,
making /usr part of / also has the effect of not caring about using a
command in /usr/bin (like a shell) in single user mode.
-john
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