On 01/11/2012 10:05 AM, Dave Young wrote: > Hi, I have some additional comments > > On 01/10/2012 11:41 PM, Cong Wang wrote: > >> On Fri, 30 Dec 2011 at 08:38 GMT, Dave Young <dyoung@xxxxxxxxxx> wrote: >>> For kdump we need scp vmcore to remote machine, the nic to be used is >>> not limited to netroot one. we need a feature for manually bringing up >>> network interface. Also it is useful for emergency shell with >>> ssh-client for recovery or test purpose >>> >>> I implement this by adding one argument to ifup script, user can use >>> `/sbin/ifup eth0 -m` to bring up eth0, note ifup will regard it a >>> manual operation for the nic specified in 1st argument if there's >>> the 2nd argument. >>> >>> If same nic is used for netroot the 2nd argument will be ignored, >>> in this case we will leave netroot bring up it automatically to >>> avoid side effect. And in this case hooks such as kdump will need to >>> execute after netroot mounted. >>> >>> `ifup eth0 -m` will create /tmp/net.eth0.manualup stamp file, >>> later dhclient-script can check this and pass $2 to netroot, >>> then netroot script will bring eth0 up >>> >> >> As we talked on IRC, we still need to discuss if this is really >> needed, from kdump perspective. > > > manually ifup nic also benefit to emergency shell use case. I want to > use dracut initramfs as a minimal system without real root for kernel > testing > >> If we need to invoke `ifup` by >> ourselves, then we also need to determine which NIC we should bring >> up, this will make kdump code larger. >> >> So, I hope, we can have some kernel cmdline (like ip=...) to tell >> dracut which NIC we want to bring up in the second kernel, provided by >> either ssh-client module or nfs module. > > > If we need to pass the nic name to cmdline then we still need to > determine which one should be use. > > If we just bring up all nics, then use the manual ifup is also easy. > > current dracut udev rules is: if there's no nic specified it will ifup > all possible nics, but all will be put in initqueue which finally be > brought up by netroot script. And if without netroot cmdline set netroot script will just fail and return, so in this case ifup will act as nop > >> >> Let's see what Harald thinks... > >> >> -- >> To unsubscribe from this list: send the line "unsubscribe initramfs" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > -- Thanks Dave -- To unsubscribe from this list: send the line "unsubscribe initramfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
