mount -u -o rw / not working on NFS?
jamesh at lanl.gov
Mon Nov 19 10:01:13 PST 2007
On Mon, 2007-11-19 at 18:33 +0100, Laszlo Nagy wrote:
> Hi All,
> I have a system where a diskless FreeBSD 6.3 i386 machine boots with pxeboot from a FreeBSD 6.3 amd64 machine. I have lines in /etc/fstab for the diskless machine like:
> # Device MountPoint FsType Options Dump Pass
> 172.16.0.1:/usr /usr nfs rw 0 0
> 172.16.0.1:/mnt/d2/rootfs/root /root nfs rw 0 0
> The machine boots from network nicely, then I can login as root and invoke these commands:
> mount -u -o rw /
> mount -u -o rw /usr
> mount -u -o rw /root
> There is no error message on the console, nor in the system log. However, this happens afterwards:
> diskless101#mkdir /aaa
> mkdir aaa: Read-only file system
> Question: if the remount did not succeed, why didn't it throw an error? If succeeded, why can't I write on the filesystem?
The answer to the second portion is that you're mounted as a read only
file system, so there's no write access.
There's an nfs permissions file you may need to edit, /etc/exports/,
which controls whether NFS shares the file system as read only, read
write, whether root can have root on the file system etc.
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