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[Launchpad Bug Tracker <1584092@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-fan - 0.9.1

---------------
ubuntu-fan (0.9.1) xenial; urgency=medium

  [ Andy Whitcroft ]
  * fanatic: fix legacy command line form syntax error (LP: #1584150)
  * fanctl/fanatic: add help commands/options with initial pointers
    (LP: #1535054)

  [ Jay Vosburgh ]
  * fanatic: fix underlay with calculation (LP: #1584092)

  [ Andy Whitcroft ]
  * fanctl/fanatic: remove invalid web reference from manual pages.
    (LP: #1582956)
  * fanatic: detect user specified underlay address without overlay
    (LP: #1584692)
  * fanatic: switch from lxd-images to using cached lxc images. (LP: #1584775)
  * fanatic: test-host -- use the selected underlay width to calculate the remote addresses
    (LP: #1584878)
  * fanctl: fix net start/stop exit codes. (LP: #1551747)
  * fanatic: install ping and nc when needed (LP: #1586176)
  * fanatic: switch docker testing to lts images (LP: #1586169)

 -- Andy Whitcroft <apw@xxxxxxxxxx>  Mon, 04 Jul 2016 14:35:39 +0100

** Changed in: ubuntu-fan (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1584092

Title:
  Docker misconfigured when using non-default overlay/underlay netmask
  size

Status in ubuntu-fan package in Ubuntu:
  Fix Released
Status in ubuntu-fan source package in Xenial:
  Fix Released

Bug description:
  Fan allows for variable sized subnet map sizes.  For example, if I
  want to map a /24 to a /16 instead of the default /16 to /8, Fan
  supports this.  However, when configuring this via fanatic, I see that
  docker configuration fails.  In /etc/default/docker, the --fixed-cidr
  flag is defined incorrectly.

  $ sudo fanatic
  Welcome to the fanatic fan networking wizard.  This will help you set
  up an example fan network and optionally configure docker and/or LXD touse this network.  See fanatic(1) for more details.

  Configure fan underlay (hit return to accept, or specify alternative) [192.168.0.0/16]: 192.168.1.0/24
  Configure fan overlay (hit return to accept, or specify alternative) [250.0.0.0/8]: 250.99.0.0/16
  Create LXD networking for underlay:192.168.1.0/24 overlay:250.99.0.0/16 [Yn]: Y
  Profile fan-250-99 created
  Create docker networking for underlay:192.168.1.0/24 overlay:250.99.0.0/16 [Yn]: Y
  Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
  Test LXD networking for underlay:192.168.1.10/24 overlay:250.99.0.0/16
  (NOTE: potentially triggers large image downloads) [Yn]: n
  Test docker networking for underlay:192.168.1.10/24 overlay:250.99.0.0/16
  (NOTE: potentially triggers large image downloads) [Yn]: n
  This host IP address: 192.168.1.10
  Remote test host IP address (none to skip):
  /usr/sbin/fanatic: Testing skipped

  $ grep "DOCKER_OPTS" /etc/default/docker
  # Use DOCKER_OPTS to modify the daemon startup options.
  #DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4"
  DOCKER_OPTS=" -b fan-250-99 --mtu=1450 --iptables=false --fixed-cidr=250.99.10.0/40"

  May 20 05:15:30 macbook docker[27364]:
  time="2016-05-20T05:15:30.411933688-07:00" level=fatal msg="Error
  starting daemon: Error initializing network controller: invalid CIDR
  address: 250.99.10.0/40"

  ===
  [Impact]

  Non default network splits are not honoured correctly.

  [Test Case]

  Setup fan with non /8 /16 split, as per reporter.

  [Regression Potential]

  Low, as these currently do not work correctly.

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