Re: [PATCH] auto setup network without netroot

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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 code


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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