Re: [PATCH] auto setup network without netroot

[Cong Wang <xiyou.wangcong@xxxxxxxxx>]

On 01/30/2012 04:51 PM, Dave Young wrote:
> On 01/30/2012 04:33 PM, Cong Wang wrote:
>
> > On Mon, 30 Jan 2012 at 06:43 GMT, Dave Young<dyoung@xxxxxxxxxx>  wrote:
> > > Current dracut network only will be setup when netroot is used. But there are
> > > some cases we need network even without netroot. For example kdump will need
> > > copy vmcore to remote machine via scp or nfs mount. OTOH, if we use dracut as
> > > a recovery system the network is helpful even root is not a network device.
> > >
> > > This implementation is based on the manually bring up method. Here add a kernel
> > > cmdline argument rd.neednet. If rd.neednet is set dracut will bring up network
> > > with ifup $INTERFACE -m. If netroot is used we still keep original behavior.
> >
> > I don't think we really need to introduce a new cmdline, I think we
> > can re-use ip= cmdline. Currently, if ip= is specified but netroot is
> > not, ip= will be ignored. We can change this, let dracut bring up
> > network as long as we have ip=, even we don't have netroot.
>
>
> For netroot case it is supported as well for no ip= or other network
> cmdline, please see the net-genrules.sh code


Irrelevant.

> We will also setup network when rd.neednet=1 in case no special ip=
> provided for convenience.

With rd.neednet=1 but without ip=, how can you know which nic we need to 
bring up?
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