[Bug 1640147] Re: [2.1] rsyslog is flooded with "no link-local IPv6 address for $IFACE" on commissioning

[LaMont Jones]

tl;dr: dhclient -6 should be less spam-chatty in the presence of no ipv6
support.

If dhclient logged that as one message, instead of 9 messages, then
syslog would compress the output.

The easiest way that I've seen to reproduce this is to boot with
ipv6.disable=true on the kernel command line.

Nobuto: do you have ipv6 disabled via the kernel command line?  (This is
known to cause various issues for a number of daemons.)

** Also affects: isc-dhcp (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  [2.1] rsyslog is flooded with "no link-local IPv6 address for $IFACE"
  on commissioning

Status in MAAS:
  Triaged
Status in isc-dhcp package in Ubuntu:
  New

Bug description:
  When commissioning, /var/log/maas/rsyslog/ is flooded with the
  repeated messages below with over 30,000 lines.

  ====
  Nov  8 11:57:54 bunyip dhclient[4734]: no link-local IPv6 address for enp4s0f0
  Nov  8 11:57:54 bunyip dhclient[4734]: 
  Nov  8 11:57:54 bunyip dhclient[4734]: If you think you have received this message due to a bug rather
  Nov  8 11:57:54 bunyip dhclient[4734]: than a configuration issue please read the section on submitting
  Nov  8 11:57:54 bunyip dhclient[4734]: bugs on either our web page at www.isc.org or in the README file
  Nov  8 11:57:54 bunyip dhclient[4734]: before submitting a bug.  These pages explain the proper
  Nov  8 11:57:54 bunyip dhclient[4734]: process and the information we find helpful for debugging..
  Nov  8 11:57:54 bunyip dhclient[4734]: 
  Nov  8 11:57:54 bunyip dhclient[4734]: exiting.
  ====

  $ wc -l /var/log/maas/rsyslog/bunyip/2016-11-08/messages
  39278 /var/log/maas/rsyslog/bunyip/2016-11-08/messages

  It would be nice to suppress those lines if those could be safely
  ignored. It would make troubleshooting easier when something wrong
  happened on commissioning.

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