Re: [RFC] dropping network hotplug support from network service

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On 06/20/2011 05:09 PM, Bill Nottingham wrote:
> I'm considering drop the network hotplug support from the 'network'
> service. This is the code that would automatically run ifup when a new
> network device appeared, if there was a configuration for it.
>
> The supported solution would be to use NetworkManager for these usage
> cases (or wicd, or netplugd, or conman...) Alternatively, just run
> ifup yourself.
>
> Currently, this would happen in the following cases:
> 1. USB and/or expresscard hotplugged ethernet/wireless
> 2. PCI hotswap of a network card
> 3. Runtime addition of network interfaces in virtual system
> 4. Admin manually removes and reloads a driver module
>
> For #1, those systems are generally better served by NM.
> For #2, this is something with such heavy admin interaction that I
> would suspect that it would be preferred to handle it manually. (Also,
> swapping hardware likely invalidates the configuration in any case.)
> For #3, you're unlikely to have a configuration written for a freshly
> available device.
sorry, I don't understand this statement....
but has me worried for virt hot add/remove of assigned devices

> For #4, bringing up the device automatically can cause more issues
> than it solves. (We've seen this happen for vlans, for example.)
This is done all the time (on KVM hosts) to take down PF driver & load 
PF+VF drivers for SRIOV-capable devices.

>
> I'm curious - are there people that still rely on this behavior? If so,
> for what cases?
>
> Thanks,
> Bill

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