Commands and relevant output

$ lxc launch ubuntu-daily:16.04 number-one -p default -p docker                                              Creating number-one
Starting number-one



$ lxc exec number-one -- apt install docker.io -y
[...]



$ lxc launch ubuntu-daily:16.04 number-two -p default -p docker                                              Creating number-two
Starting number-two



$ lxc exec number-two -- apt install docker.io -y
[...]



$ lxc list
+------------+---------+--------------------------------+------+------------+-----------+
|    NAME    |  STATE  |              IPV4              | IPV6 |    TYPE    | SNAPSHOTS |
+------------+---------+--------------------------------+------+------------+-----------+
| number-one | RUNNING | 172.17.0.1 (docker0)           |      | PERSISTENT | 0         |
|            |         | 10.1.189.47 (eth0)             |      |            |           |
+------------+---------+--------------------------------+------+------------+-----------+
| number-two | RUNNING | 172.17.0.1 (docker0)           |      | PERSISTENT | 0         |
|            |         | 10.1.189.19 (eth0)             |      |            |           |
+------------+---------+--------------------------------+------+------------+-----------+



$ lxc exec number-one -- journalctl -u docker.service
[...]
Nov 26 11:03:41 number-one dockerd[1688]: time="2016-11-26T11:03:41.144943863Z" level=warning msg="Running modprobe bridge br_netfilter failed with message: modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.
Nov 26 11:03:41 number-one dockerd[1688]: time="2016-11-26T11:03:41.146418122Z" level=warning msg="Running modprobe nf_nat failed with message: `modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.4.0-47-gener
Nov 26 11:03:41 number-one dockerd[1688]: time="2016-11-26T11:03:41.147532075Z" level=warning msg="Running modprobe xt_conntrack failed with message: `modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.4.0-47
[...]
Nov 26 11:03:41 number-one dockerd[1688]: time="2016-11-26T11:03:41.266765487Z" level=warning msg="Could not load necessary modules for IPSEC rules: Running modprobe xfrm_user failed with message: `modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() co
Nov 26 11:03:41 number-one dockerd[1688]: time="2016-11-26T11:03:41.267103707Z" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be used to set a preferred IP address"
[...]



$ lxc exec number-two -- journalctl -u docker.service
[...]
Nov 26 11:04:12 number-two dockerd[1665]: time="2016-11-26T11:04:12.316648711Z" level=warning msg="Running modprobe bridge br_netfilter failed with message: modprobe: ERROR: ../libkmod/libkmod.c:58
Nov 26 11:04:12 number-two dockerd[1665]: time="2016-11-26T11:04:12.317805692Z" level=warning msg="Running modprobe nf_nat failed with message: `modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_searc
Nov 26 11:04:12 number-two dockerd[1665]: time="2016-11-26T11:04:12.319602888Z" level=warning msg="Running modprobe xt_conntrack failed with message: `modprobe: ERROR: ../libkmod/libkmod.c:586 kmod
[...]
Nov 26 11:04:12 number-two dockerd[1665]: time="2016-11-26T11:04:12.385903872Z" level=warning msg="Could not load necessary modules for IPSEC rules: Running modprobe xfrm_user failed with message:
Nov 26 11:04:12 number-two dockerd[1665]: time="2016-11-26T11:04:12.386251843Z" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be use
[...]