facter fails to detect network interfaces with long names
Alex L. Demidov
truncated to 9 chars (there is closed bug report [1]).
Unfortunately, `facter` uses `ifconfig -a` output to get list of
interface names and because of truncation it generates `interfaces`
fact with incorrect interface names. Also it fails to retrieve
individual interface information with following message for
each interface with name "myinterface":
Device "myinterfa" does not exist.
myinterfa: error fetching interface information: Device not found
[1]: https://bugs.gentoo.org/show_bug.cgi?id=179920
--
Alex L. Demidov (ALD9-RIPE).
http://alexeydemidov.com/
Freelance Consulting.
Ken Barber
What happens when you run 'ip addr list' instead?
ken.
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Alex L. Demidov
> Hi Alex,
>
> What happens when you run 'ip addr list' instead?
It shows interface names properly and not truncated.
Ken Barber
http://projects.puppetlabs.com/issues/1346
Although - I don't see a 9 char limitation on Debian Wheezy. Not sure
where that patch came from though. I wonder how many other distros
suffer from this.
Of slightly related interest - I do see a 15 character limit when
using 'brctl addbr somelongnamefoo' to create a named interface - and
that seems to exist for both ifconfig and ip addr when reading the
interfaces. So I'm guessing 15 chars is the kernel limit or perhaps
brctl limit :-).
ken.
On Tue, Sep 20, 2011 at 6:31 PM, Alex L. Demidov
<alexey...@gmail.com> wrote:
> On Tue, Sep 20, 2011 at 06:24:40PM +0100, Ken Barber wrote:
>> Hi Alex,
>>
>> What happens when you run 'ip addr list' instead?
>
> It shows interface names properly and not truncated.
>
>>
>> ken.
>>
>> On Tue, Sep 20, 2011 at 6:20 PM, Alex L. Demidov
>> <alexey...@gmail.com> wrote:
>> > I have Gentoo host where `ifconfig -a` prints long interface names
>> > truncated to 9 chars (there is closed bug report [1]).
>> >
>> > Unfortunately, `facter` uses `ifconfig -a` output to get list of
>> > interface names and because of truncation it generates `interfaces`
>> > fact with incorrect interface names. Also it fails to retrieve
>> > individual interface information with following message for
>> > each interface with name "myinterface":
>> >
>> > Device "myinterfa" does not exist.
>> > myinterfa: error fetching interface information: Device not found
>> >
>> > [1]: https://bugs.gentoo.org/show_bug.cgi?id=179920
>
> --
> Alex L. Demidov (ALD9-RIPE).
> http://alexeydemidov.com/
> Freelance Consulting.
>
Alex L. Demidov
> I think this gives a little weight to this ticket for Facter then:
>
> http://projects.puppetlabs.com/issues/1346
>
> Although - I don't see a 9 char limitation on Debian Wheezy. Not sure
> where that patch came from though. I wonder how many other distros
> suffer from this.
It seems that they (and RHEL/Fedora) patched this long ago.
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=405521
>
> Of slightly related interest - I do see a 15 character limit when
> using 'brctl addbr somelongnamefoo' to create a named interface - and
> that seems to exist for both ifconfig and ip addr when reading the
> interfaces. So I'm guessing 15 chars is the kernel limit or perhaps
> brctl limit :-).
Luckily all my interface names under 15 chars length.
Matthew Marlowe
I put in a request to have the gentoo bug reopened and see if we can
apply the same patch that the other distributions used.
Thanks,
Matt
On Tue, Sep 20, 2011 at 11:16 AM, Alex L. Demidov