[Server-devel] Notes on replacing bridging with bonding

[Jerry Vonau]

Jerry Vonau wrote:
> Jerry Vonau wrote:
>> Martin Langhoff wrote:
>>> On Mon, Sep 8, 2008 at 7:43 PM, Alexander Dupuy <alex.dupuy at mac.com> wrote:
>>>> I have placed TYPE=Bonding in the ifcfg-bond0 config files, but this is not
>>>> needed for Fedora 7 or later (it doesn't hurt to have it, though)
>>> well, I grepped network-functions and ifup-eth and none of the TYPE
>>> checks are for bonding anything. The check is done against the output
>>> of modprobe. So if it's going to be ignored, I'll save the
>>> corresponding bytes (and potential confusion later).
>>>
>> ifup does a check for type=Bridge
>>
> Bonding can be handled via VLAN=yes and PHYDEV=msh0 in the ifcfg files 
> for the bond device, ifup uses those values to setup the bonding in a 
> hotplug environment. The slave (msh0) should have SLAVE=yes MASTER=bond0 
> in its file. Hotplug works also, bond0 doesn't need to have its slave 
> present to become active, plug the slave in, becomes active and bonding 
> does the right thing. Bye, bye dummy interface.
> 
>>>>> # cat /etc/modprobe.d/xs-bonding
>>>>> alias bond0 bonding
>>>>>
>>>> A modprobe.d/ directory - that's a nice trick!  I wasn't aware of this, so
>>>> just added some lines to the /etc/modprobe.conf file:
>>> that's what the most modern doco could find suggested. And the
>>> ifup-eth src is clearly looking at the output of modprobe, so there's
>>> something to it...
>>>
>> well, udev loads the modules on boot, for configured devices. "network" 
>> checks to see if the required module for the nic is loaded, if missing 
>> loads it.
>>
> Think we can just dump a file in /etc/modprobe.d/ with the bonding 
> options needed. I've been using bonding mode=active-backup miimon=100" 
> to test with, any idea what we may be using here?
> 

Better yet just add BONDING_OPTS= it the ifcfg file.

Since the docs are hard to find without the kernel source rpm, here are 
all the docs from a kernel 2.6.25 source rpm for networking. See bonding.txt

http://members.shaw.ca/jvonau/pub/network

Jerry