NETWORKER ALERT: network worker causing problems in 1.21

[Dimiter Naydenov]

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Hey Tim,

I'm sorry the networker is causing trouble for you guys. It was
causing issues for us in MaaS and EC2 as well, there were several
fixes to reduce the networker's impact and in fact it is now totally
disabled on trunk. It will stay that way until we have time to fix it
properly.

However, the networker even in 1.21 is only causing issues when
modifying /etc/network/interfaces inappropriately it *does not* decide
what addresses a machine should use or modifies them in any way.
That's done by the machiner. The networker just discovers the NICs on
the machine and watches in-state NIC documents for changes.

We can backport the fix that totally disables the networker to 1.22
and 1.21 as well, which will require a point release for 1.21.

How does that sound?

Cheers,
Dimiter
On  4.02.2015 22:17, Tim Penhey wrote:
> Hi folks,
> 
> There is something I'd like you to talk about while you are
> together in Cape Town.
> 
> The new networker worker was added in 1.21, and is causing many
> problems in the wild.
> 
> The lxcbr0 IP address is erroneously being chosen as the best
> address for a machine.
> 
> The worker enumerates all the NICs and gets the addresses.  We need
> to work out how to avoid selecting internal only addresses, like
> 'lxcbr0' and 'virbr0' default addresses.  There are likely to be
> issues with other things like additional other bridges or VLAN
> sub-interfaces.
> 
> I'd like you folk who understand networking more to work out some 
> heuristics that will at least get us unblocked.
> 
> Cheers, Tim
> 


- -- 
Dimiter Naydenov <dimiter.naydenov at canonical.com>
Juju Core Sapphire team <http://juju.ubuntu.com>
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