Re: [PATCH] auto setup network without netroot

[Dave Young <dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

On 01/30/2012 04:51 PM, Cong Wang wrote:

> 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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>  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?


current behavior of net-genrule.sh is below:

# Default: We don't know the interface to use, handle all

It will be ok and convenient at least when we have only one nic

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-- 
Thanks
Dave