Re: Forcing root filesystem read-only during normal operation

[Florian Kulzer <florian.kulzer+debian@icfo.es>]

On Wed, Sep 09, 2009 at 19:05:27 +1000, Ross Peachey wrote:
> Hi All,
> 
> Can anyone tell me how to force a filesystem read-only from Debian
> during normal operation? I need to do this for testing of a failure
> mode.
> 
> The following doesn't work:
> 
> * hdparm -r1 <device>
> * mount -o ro,remount /

I suspect that the second command fails because you did not specify both
the device and the directory. AFAIK, only the complete form will make
mount ignore an rw option given in /etc/fstab:

mount -o ro,remount /dev/foo /

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          Florian   |