Re: [MirageOS-devel] auto configuring ip/netmask info

[Julian Chesterfield <julian.chesterfield@xxxxxxxxx>]

Thanks Anil, I'll give it a try this evening...

- J

On 4 Mar 2014, at 20:10, Anil Madhavapeddy wrote:

> I pushed a sample unikernel that reads the kernel command line, as a quick 
> test to see if this will work for you Julian.  Note that you must pass it the 
> right "extra" kernel args or it will just exit (I didn't bother with error 
> handling as it's just during startup).
> 
> We don't expose a very flexible configuration interface through STACKV4 yet, 
> so this unikernel is written explicitly from Ethif upwards.  It's quite nice 
> that we can do this if the library abstractions aren't sufficient, if I do 
> say so myself :-)
> 
> https://github.com/mirage/mirage-skeleton/tree/master/xen/static_website%2Bip
> 
> (note that this will only compile under Xen at the moment, not Unix)
> 
> -anil
> 
> On 26 Feb 2014, at 17:10, Julian Chesterfield <julian.chesterfield@xxxxxxxxx> 
> wrote:
> 
>> I've opened a ticket for this discussion:
>> 
>> https://github.com/mirage/mirage/issues/228
>> 
>> - J
>> 
>> On 25 Feb 2014, at 20:40, Richard Mortier wrote:
>> 
>>> 
>>> On 25 Feb 2014, at 17:09, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:
>>> 
>>>> Julian and I were looking into the various Xen config options for 
>>>> networking this morning, and it turns out that the XL/XM toolstacks can 
>>>> both specify a per-VIF ip/netmask/gateway directly in the VIF 
>>>> configuration. e.g.
>>>> 
>>>> ```
>>>> vif = ['bridge=xenbr0,ip=10.0.0.2,netmask=255.255.255.0,gateway=10.0.0.1']
>>>> 
>>>> These are written into the VIF backend tree in xenstore.
>>> 
>>> aha. i wondered about that. where's the best docs on xenstore -- it's 
>>> probably something i should know a bit more about.
>>> 
>>>> I'd like to take advantage of this by having the network stack 
>>>> automatically probe for it and use it if available (i.e. a 'default' mode 
>>>> in the stack configuration, which can be overridden by the manual IP or 
>>>> DHCP options).
>>>> 
>>>> Any thoughts on the best place to put it, though?  The obvious place is in 
>>>> mirage-net-{unix/xen}, but we would need a Xenstore-equivalent for Unix 
>>>> (which has come up several times. Dave, how viable is it to have a simple 
>>>> Unix Xenstore that maps to a filesystem tree?  We can project 
>>>> configuration variables into there for tuntap, and perhaps take care of 
>>>> bridge configuration at the same time as well.
>>> 
>>> i can't comment on the viability of a unix equivalent, but that seems to 
>>> make a lot of sense to me.
>>> 
>>>> Another backend that will need an equivalent registry-style interface are 
>>>> the kFreeBSD backend (which could call back into userspace via an ioctl 
>>>> interface).
>>> 
>>> what would the js backend do?  (or would the issue simply never arise?)
>>> 
>>> -- 
>>> Cheers,
>>> 
>>> R.
>>> 
>>> 
>>> 
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