Re: How can I make root filesystem read-only?

[Oliver Elphick <olly@lfix.co.uk>]

On Thu, 2002-11-21 at 10:36, Hiroki Horiuchi wrote:
> Hello.
> 
> My /etc/fstab is like below.
> 
> /dev/sda1 /     ext2 errors=remount-ro 0 1
> /dev/sdb1 none  swap sw                0 0
> /dev/sdc1 /tmp  ext2 defaults          0 2
> /dev/sdd1 /var  ext2 defaults          0 3
> /dev/sde1 /home ext2 defaults          0 4
> 
> I am trying to make the root filesystem including /usr subdirectory
> read-only. But, if I set the mount option of / to ro, system cannot boot.
> Making only /usr read-only is not enought for me.
> Cannot root filesystem be read-only?

In effect, no.

For example, /etc must be in the root filesystem and mount writes to
/etc/mtab

Perhaps you could arrange to have a RAM disk for root?  (See initrd.)

-- 
Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight, UK                            
http://www.lfix.co.uk/oliver
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