Re: [Xen-users] usage of the extra parameter in vm configs

["Henning Sprang" <henning_sprang@xxxxxx>]

On 30 Dec 2006 15:53:35 +0000, M.A. Williamson <maw48@xxxxxxxxx> wrote:
> [...]
> You could. Or you could stick them all in the "extra" argument. The only
> real reason that the variables are done this way is that it decouples the
> user from the realities of Linux a little... Additional variables used to
> be used to pass IP / NFS root information on the command line but I'm not
> sure if this is still done...
yeah, nfs_root and dhcp also are transferred to the kernel command
line. Don't know about the others.

> The config file parser isn't *very* aware of how Linux command line syntax
> works. At some stage it may be useful to make it more aware, for purposes
> of providing more helpful configuration warnings - however, this still
> doesn't really require the separate variables.
Yes, it might look simpler for unexperienced users if they have all
the dhcp, root, ... variables, and enter exactly one value in each,
and experienced users with special needs can use "extra" for
everything special they need.

> Out of interest, would anybody on the users list object to a general shift
> towards supplying the whole command line in one variable, rather than
> piecemeal in specially named fields?
I wouldn't mind.  As said, singeling them out looks easier maybe. (for
example new users don't have to search a long "extra" line, but can be
pointed to the single root variable for adjusting a boot partition if
needed.

I think most important and sufficient would be to document it clear in
xm create --help_config and man xmdomain.cfg what is now only
documented in this thread.

Henning

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