Is there a way to run LXD inside Docker?
Is there a way to run LXD inside Docker? eg.
On a host with ubuntu 16.04:
docker run --rm -it --net host --privileged ubuntu bash
In the container:
apt update && apt install -y lxd iproute2 btrfs-tools screen bash-completion curl wget apt-transport-https lxcfs lxd-tools lxd-client vim overlayroot libkmod2 libkmod-dev cgroup-tools cgroupfs-mount cgroup-bin
screen -S lxd
# in screen
lxd --debug --group lxd
lxd init
lxc list
lxc launch ubuntu:16.04 test
The LXD daemon is running, but I am unable to start the LXD container due to errors with groups.
error: Error calling 'lxd forkstart test /var/lib/lxd/containers /var/log/lxd/test/lxc.conf': err='exit status 1'
lxc 20170502151757.409 ERROR lxc_apparmor - lsm/apparmor.c:apparmor_process_label_set:220 - If you really want to start this container, set
lxc 20170502151757.409 ERROR lxc_apparmor - lsm/apparmor.c:apparmor_process_label_set:221 - lxc.aa_allow_incomplete = 1
lxc 20170502151757.409 ERROR lxc_apparmor - lsm/apparmor.c:apparmor_process_label_set:222 - in your container configuration file
lxc 20170502151757.409 ERROR lxc_sync - sync.c:__sync_wait:57 - An error occurred in another process (expected sequence number 5)
lxc 20170502151757.409 ERROR lxc_start - start.c:__lxc_start:1346 - Failed to spawn container "test".
lxc 20170502151757.954 ERROR lxc_conf - conf.c:run_buffer:405 - Script exited with status 1.
lxc 20170502151757.954 ERROR lxc_start - start.c:lxc_fini:546 - Failed to run lxc.hook.post-stop for container "test".
I've also tried:
--cap-add=ALL
--volume /dev:/dev
--pid=host
--volume /sys/fs/cgroup:/sys/fs/cgroup
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1 answer
Not.
LXD / LXC provides a full screen Linux environment. Docker is a mechanism that allows you to wrap your application and dependencies.
Docker provides a limited environment that deliberately disables some of the OS's features related to maintaining networking and storage.
You can run Docker inside LXD / LXC containers (actually, Docker used to use LXC as the underlying technology can still do), but you won't run LXC containers inside a Docker container.
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