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Re: [Ovirt-devel] [PATCH node] The node now passes in the mac address and iface names during identify.



On Tue, Sep 23, 2008 at 12:34:32PM -0400, Perry N. Myers wrote:
> Daniel P. Berrange wrote:
> >On Tue, Sep 23, 2008 at 12:10:22PM -0400, Perry N. Myers wrote:
> >>Daniel P. Berrange wrote:
> >>>On Tue, Sep 23, 2008 at 01:18:30PM +0100, Daniel P. Berrange wrote:
> >Messaging isn't going to help us in standalone mode. We need to have any
> >augtool scripts or bash scripts in the node image, not fetched over
> >messaging or wget. So we have to fix this to only fetch config settings
> >regardless of whether we currently use messaging or not.
> 
> Agreed.  As I said above, lets just get this patch in now since we're no 
> worse off than before and since we're trying to get a release out.  But we 
> do need to fix this so that only config parameters are retrieved and not 
> augtool scripts themselves.

Yep, I'm fine with that - I didn't realize this was already merged.

> That fix can come separately from the messaging integration depending on 
> how timing works out for that.

After discussing this on IRC one thing became clear - we would be helped
by writing down some of the architectural / design requirements & guidelines
we have for the node to help people choose effective implementation strategy.
At first review it wasn't clear that Darryl's initial impl was a problem.

As a starting point, I'd suggest a HACKING file containing guidelines
for development. One such pertinent entry is

 - All functional logic has to be contained in the node image itself.
   This includes shell scripts, program, augeus scripts. Only configuration
   data can be fetched from a remote source.

   This ensures there is only a 1-way dependanancy from the WUI server
   to the node server, and not have the node depend on the WUI. This
   is important for upgradability. It also enables the node image to run
   in standalone mode storing config data locally.

   NB, we're assuming there's also secure bootstrap mechansim for getting
   the kerberos credential onto the machine.

Daniel
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