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[Adam Ryczkowski <adam.ryczkowski@xxxxxxxxxxxxxx>]

There is also a little more advanced solution, that claims to be
compatible with systemd as well: https://github.com/CameronNemo/lxc-net

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https://bugs.launchpad.net/bugs/1389849

Title:
  sudo service lxc-net restart does not reload dnsmasq when there is a
  container running

Status in “lxc” package in Ubuntu:
  New

Bug description:
  I know, that I can assign static IP manually, using
  /etc/network/interfaces.

  I also know, that I can read the MAC address of the LXC container
  (e.g. by looking for lxc.network.hwaddr entry in /var/lib/lxc
  /<container-name>/config and assign the IP based using entries dhcp-
  host=<mac-addr>,10.0.3.3 in /etc/dnsmasq.d/<some file>.

  In the file /etc/default/lxc-net I read

  # Uncomment the next line if you'd like to use a conf-file for the lxcbr0
  # dnsmasq.  For instance, you can use 'dhcp-host=mail1,10.0.3.100' to have
  # container 'mail1' always get ip address 10.0.3.100.
  #LXC_DHCP_CONFILE=/etc/lxc/dnsmasq.conf

  That would suit my needs; unfortunately doing so has no effect - at
  least not until the next computer reboot.

  I would expect that `sudo service lxc-net restart` forces the dnsmasq
  to reload - unfortunately it never works.

  To reproduce:
  On Ubuntu Trusty 14.04 64bit,
  1. install package lxc,
  2. create a container (e.g. sudo lxc-create -n mycontainer -t ubuntu -- -r trusty)
  3. start it (sudo lxc-start -d -n mycontainer)
  4. create another container (e.g. sudo lxc-create -n my2ndcontainer -t ubuntu -- -r trusty)
  5. edit /etc/default/lxc-net to uncomment the LXC_DHCP_CONFILE
  6. edit /etc/lxc/dnsmasq.conf to contain a line like `dhcp-host=my2ndcontainer,10.0.3.142`
  7. sudo service lxc-net restart
  8. start the 2nd container (sudo lxc-start -d -n my2ndcontainer)

  The steps 2 and 3 are optional.

  The 2nd container never gets the ip 10.0.3.142, but it keeps the
  assigned dynamic IP

  Walkaround 1:
  Turn off the computer and test again tomorrow.

  Walkaround 2 (more serious, but works only if steps 2 and 3 are
  skipped):

  name=my2ndcontainer
  sudo lxc-stop -n $name >/dev/null
  sudo service lxc-net stop >/dev/null
  if [ -d /sys/class/net/$internalif ]; then
     sudo brctl delbr $internalif >/dev/null #Why? See below.
  fi
  sudo rm /var/lib/misc/dnsmasq.$internalif.leases
  sudo service lxc-net start >/dev/null
  sudo lxc-start -d -n $name >/dev/null
  sleep 5

  Unfortunately, there is a bug (feature?) in the /etc/init/lxc-net.conf
  in Ubuntu 14.04 that prevents reloading the dnsmasq unless the bridge
  device is down for the host.

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