LXD : launch systemd based containers on non systemd based LXD host( Ubuntu 14.04)

Reference

https://github.com/lxc/lxcfs

LXD host

$ tail -1 /etc/lsb-release DISTRIB_DESCRIPTION="Ubuntu 14.04.4 LTS"

install lxcfs

$ cat /etc/apt/sources.list.d/lxcfs.list deb http://ppa.launchpad.net/ubuntu-lxc/lxcfs-stable/ubuntu trusty main deb-src http://ppa.launchpad.net/ubuntu-lxc/lxcfs-stable/ubuntu trusty main $ sudo apt-get update $ sudo apt-get install lxcfs $ ls /var/lib/lxcfs/ cgroup  proc $ ps aux | grep lxcfs | grep -v grep root      2662  0.0  0.0 382476  1952 ?        Ssl   8月29   3:43 /usr/bin/lxcfs /var/lib/lxcfs

Launch an instance ( Ubuntu 16.04 )

can’t use systemctl..

$ lxc launch ubuntu:16.04 test01 -e Creating test01 Retrieving image: 100% Starting test01 $ lxc exec test01 -- /bin/bash root@test01:~# cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=16.04 DISTRIB_CODENAME=xenial DISTRIB_DESCRIPTION="Ubuntu 16.04.1 LTS" root@test01:~# systemctl reboot Failed to connect to bus: No such file or directory Failed to connect to bus: No such file or directory Failed to connect to bus: No such file or directory

stop the container.

$ lxc stop test01 --force

edit /etc/lxc/default.conf

add the followings.

# add for systemd based containers lxc.mount.auto = cgroup:mixed lxc.autodev = 1 lxc.kmsg = 0 lxc.include = /usr/share/lxc/config/common.conf.d/00-lxcfs.conf

$ lxc launch 419af7170d66 -e test01 $ lxc exec test01 -- systemctl Failed to connect to bus: No such file or directory $ lxc stop test01 --force

restart lxd

$ sudo /etc/init.d/lxd restart

still can’t use systemclt.

$ sudo lxc launch 419af7170d66 test01 -e $ lxc exec test01 -- systemctl Failed to connect to bus: No such file or directory

$ lxc stop test01 --force

create a config file for this container.

# vi /var/lib/lxd/containers/test01/config

# cat /var/lib/lxd/containers/test01/config lxc.mount.auto = cgroup:mixed lxc.autodev = 1 lxc.kmsg = 0 lxc.include = /usr/share/lxc/config/common.conf.d/00-lxcfs.conf

start the container

$ lxc start test01

I was able to use systemctl ☺

$ lxc exec test01 -- systemctl  UNIT                                    LOAD   ACTIVE     SUB       DESCRIPTION  dev-sda1.device                         loaded activating tentative dev-sda1.device  -.mount                                 loaded active     mounted   /  dev-.lxd\x2dmounts.mount                loaded active     mounted   /dev/.lxd-mounts

$ lxc stop test01 $ lxc list test01 +--------+---------+------+------+------------+-----------+ |  NAME  |  STATE  | IPV4 | IPV6 |    TYPE    | SNAPSHOTS | +--------+---------+------+------+------------+-----------+ | test01 | STOPPED |      |      | PERSISTENT | 0         | +--------+---------+------+------+------------+-----------+

CentOS7 container.

$ lxc init images:centos/7/amd64 test02

$ cat /var/lib/lxd/containers/test02/config lxc.mount.auto = cgroup:mixed lxc.autodev = 1 lxc.kmsg = 0 lxc.include = /usr/share/lxc/config/common.conf.d/00-lxcfs.conf

$ lxc start test02 $ lxc exec test02 -- cat /etc/centos-release CentOS Linux release 7.2.1511 (Core) $ lxc exec test02 -- systemctl  UNIT                                   LOAD   ACTIVE SUB       DESCRIPTION  -.mount                                loaded active mounted   /  dev-.lxd\x2dmounts.mount               loaded active mounted   /dev/.lxd-mounts