I haven't tested this patch, but fanctl had the same issue, and I believe the fix is that the subnet math has to be "overlay_width + ( 32 - underlay_width )", not "overlay_width + underlay_width".
Patch attached. ** Patch removed: "fanatic patch" https://bugs.launchpad.net/ubuntu/+source/ubuntu-fan/+bug/1584092/+attachment/4667027/+files/fanatic.patch -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to ubuntu-fan in Ubuntu. https://bugs.launchpad.net/bugs/1584092 Title: Docker misconfigured when using non-default overlay/underlay netmask size Status in ubuntu-fan package in Ubuntu: New 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" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-fan/+bug/1584092/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
