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List:       user-mode-linux-user
Subject:    Re: [uml-user] start uml read-only but hangs while root file	system
From:       Antoine Martin <antoine () nagafix ! co ! uk>
Date:       2006-06-30 12:26:49
Message-ID: 1151670410.20025.7.camel () ant ! internal
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> On Thu, Jun 29, 2006 at 11:56:05PM +0800, paul john wrote:
> > i tried to make a system ,that users can't modify it. is that often
> be used
It can be done, but it is more difficult using a standard distribution
as a base: you're better off starting with something like busybox.
Early in the boot, mount /var/ and /tmp as tmpfs + other tweaks.

If you have no syslog (or remote syslog via tcp or udp) and just one or
two deamons to run, you can get away with just a /chroot mounted tmpfs
(and copy the required files in there).

If your daemons don't write anything (rare - but some network daemons
are like that) then you can have a fully read-only filesystem.

> > ubd0*r *,this r is always won't be use ?
> 
> What do you think would happen if you tried booting a machine with its
> root filesystem on a CD-ROM?
> 
>                                 Jeff


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