[Swift-devel] Re: InternalHostname in sites file

[Mihael Hategan]

Right. If the head node has multiple network interfaces, only one of
which is visible from the worker nodes.

The choice of which interface is the one that worker nodes can connect
to is a matter of the particular cluster. It's not particularly easy to
have an automated mechanism that figures it out. We tried some scheme to
pass all the interface addresses to the worker and let it try to connect
to all of them in order, but that didn't work very well. Of course,
there might be a scheme that works, but I didn't want to spend too much
time on that.

So that's why it's needed. To clarify to the workers which exact
interface on the head node they are to try to connect to.

Mihael

On Thu, 2011-06-02 at 14:10 -0500, Jonathan S Monette wrote:
> Mihael,
>    I believe we have talked about this before but why is it necessary
> for an InternalHostname to be specified for PADS?  I know that the
> address that coasters connects to is wrong but I do not remember why
> that was.  Could you give an explanation on why internalHostname needs
> to be set?
> 
> -- 
> 
> 
> Any intelligent fool can make things bigger and more complex... It
> takes a touch of genius - and a lot of courage to move in the opposite
> direction.
> 
> - Albert Einstein
> 
> 
>