Re: Newbie Question
From: Bill Vermillion (bv_at_wjv.com)
Date: 03/10/05
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Date: Thu, 10 Mar 2005 13:25:01 GMT
In article <d0n366$t2v$1@asmodee.lpthe.jussieu.fr>, Michel Talon
<talon@lpthe.jussieu.fr> wrote:
>MattD.. <mattd145@gmail.com> wrote:
>
>> On Wednesday 09 Mar 2005 12:53, Michel Talon came home, took
>> out the glass eye, put the false teeth in Steradent, took off
>> the false leg and wig and sat down. Then what was left typed:
>> > May you elaborate why this is true?
>> I always believed that it was because the default shell is the
>> only one that is guaranteed to be there and working after an
>> upgrade, thus not locking root out of the machine, which would
>> be a bit of a swine on a co-lo machine. OK, a local machine
>> would have sh and single user, but even so...
>I had not thought about colocated machines. Here you have a
>point. If you have access to the console, then you can always
>get a working shell, whatever shell you have given to root,
>by booting single user. Since FreeBSD-5, static executables
>guaranteed to run are under /rescue, and the shells under /bin
>are dynamically linked, rendering dubious the traditional
>argument about /usr/local/bin/zsh (or bash or whatever) not
>being static - moreover one can always compile them static. For
>colocated machines, you are right, problems may ensue after an
>upgrade, on the other hand problems may be generated by other
>causes, and it is not very safe to do upgrades on distant
>machines - this is an understatement (*). In general, for the
>standard desktop user, changing his root shell presents no
>problem whatsoever.
I make sure that everything I'm going to want/need is not in a
mountable /usr partition.
Maybe I've been luck but I've never had any problem [see exception
below] in upgrading any machine in the colo for the past 4 years
we've been in this location.
>(*) for example my laptop, which runs FreeBSD-4, hangs on reboot,
>it doesn't do that when rebooting from Windows. If i was to
>upgrade it remotely, i would be screwed big times, irrespective
>of shell details!
Not many people run laptops remotely :-)
The exception on the reboot, was on our spare machine when I
upgraded the OS and it did not reboot. It turns out that another
person who had access to the rack had set something down on the
keyboard and the KVM was connected to the machine - and it hung
because a key was continually pressed. You can never completely
eliminate human carelessness.
Bill
-- Bill Vermillion - bv @ wjv . com
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