From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Young Subject: Re: [PATCH] auto setup network without netroot Date: Mon, 30 Jan 2012 17:16:52 +0800 Message-ID: <4F266004.5080501@redhat.com> References: <20120130064305.GA7108@darkstar.nay.redhat.com> <4F265A0B.1000402@redhat.com> <4F265A22.2090407@gmail.com> <4F265C01.4010701@redhat.com> <4F265CDB.7070204@gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4F265CDB.7070204-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Sender: initramfs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Content-Type: text/plain; charset="us-ascii" To: Cong Wang Cc: initramfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org On 01/30/2012 05:03 PM, Cong Wang wrote: > On 01/30/2012 04:59 PM, Dave Young wrote: >> On 01/30/2012 04:51 PM, Cong Wang wrote: >> >>> On 01/30/2012 04:51 PM, Dave Young wrote: >>>> >>>> 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 > > So, rd.neednet=1 will bring up all when there is no ip=, what kdump > needs is a cmdline that tells dracut to bring up only the ones we need. > > You still don't tell why re-using ip= doesn't work. So far, I think ip= > can be re-used for kdump case, and is better than your rd.neeednet=1. How to say... There's many different configs for network like: 1. ip={dhcp|on|any|dhcp6|auto6|ibft} 2. ip=:{dhcp|on|any|dhcp6|auto6} 3. ip=:[ ]:::::{none|off} 4. ifname= 5. bootdev= 6. root=nfs:[snip] They are all possibly be used, IHMO they are not good options for this patch using. For example there's no NIC specified in 1 and 3, we will still have to bring up the default Also this is a general feature, maybe it will be used by users other than kdump. For kdump I think we can use proper ip= plus rd.neednet=1 -- Thanks Dave