Re: how to execute a script from NFS mount (which disconnected)?

[Jeff Layton <jlayton@redhat.com>]

On Tue, 22 May 2007 08:25:54 -0400
Jeff Layton <jlayton@redhat.com> wrote:

> On Tue, 22 May 2007 14:17:49 +0200
> Tomasz Chmielewski <mangoo@wpkg.org> wrote:
> 
> > Trond Myklebust schrieb:
> > > On Tue, 2007-05-22 at 12:37 +0200, Tomasz Chmielewski wrote:
> > >> How can I execute a script from NSF mount - a script which reconfigures 
> > >> a network interface, and there is a period of network disconnection?
> > > 
> > > Copy it to a RAMFS partition and execute it there.
> > 
> > No, that's not a good solution. Or a solution I would want to use.
> > 
> > I use the same script on systems having rootfs on iSCSI. And they also 
> > disconnect for a brief period of time.
> > There, everything works properly if I just "preload"/cache the 
> > script/programs with something like:
> > 
> > 	cat script &>/dev/null
> > 	program --help &>/dev/null
> > 
> > Then, I can disconnect the station for several minutes, but the system 
> > will have the programs/scripts cached, and will be able to use them.
> > 
> > 
> > I would like to do something similar with NFS. Isn't there a 
> > "disconnected" mode for NSF (or "cached", etc.)?
> > 
> 
> Nope. NFS will (likely) want to check the attributes on the file to make sure
> it's not changed before executing it. Copying it to a secondary location is
> what you'll want to do.
> 
> <idle speculation>
> I wonder if you could do something like this on NFSv4 with delegations?
> </idle speculation>
> 

If it's falling down in the middle of execution, however, the problem may be
that the path or something is crossing onto an NFS mount, or it could be
hanging on something like NIS. You may want to try stracing it to see what
system call it's trying to execute when the hang occurs...

> > 
> > -- 
> > Tomasz Chmielewski
> > http://wpkg.org
> > 
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> 
> 
> -- 
> Jeff Layton <jlayton@redhat.com>
> 
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-- 
Jeff Layton <jlayton@redhat.com>

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