Добрый вечер, Вопрос по buildroot 2018.2 + docker-engine. Успешно собрал прошивку с

buildroot системой на busybox , прикрутил при сборке docker-engine c dockerd. После загрузки системы в процессе проверки работы докера получил ошибку что не иницилазирован dockerd сервис (служба). T.к. systemd в системе нет, как можно/следует запустить dockerd из busybox или из busybox это очень сложно сделать?

[root@ok3568:/]# docker images
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
[root@ok3568:/]# dockerd
INFO[0000] libcontainerd: new containerd process, pid: 854
WARN[0000] containerd: low RLIMIT_NOFILE changing to max current=1024 max=4096
ERRO[0001] Failed to built-in GetDriver graph zfs /var/lib/docker
ERRO[0001] 'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded.
ERRO[0001] 'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded.
INFO[0001] Graph migration to content-addressability took 0.00 seconds
WARN[0001] Your kernel does not support cgroup memory limit
WARN[0001] Unable to find cpu cgroup in mounts
WARN[0001] Unable to find blkio cgroup in mounts
WARN[0001] Unable to find cpuset cgroup in mounts
WARN[0001] mountpoint for pids not found
Error starting daemon: Devices cgroup isn't mounted
[root@ok3568:/]# which cgroup
[root@ok3568:/]# groups
root
[root@ok3568:/]# uname -r
4.19.206
[root@ok3568:/]# start-stop-daemon -S -x dockerd
INFO[0000] libcontainerd: new containerd process, pid: 922
WARN[0000] containerd: low RLIMIT_NOFILE changing to max current=1024 max=4096
ERRO[0001] Failed to built-in GetDriver graph zfs /var/lib/docker
ERRO[0001] 'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded.
ERRO[0001] 'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded.
INFO[0001] Graph migration to content-addressability took 0.00 seconds
WARN[0001] Your kernel does not support cgroup memory limit
WARN[0001] Unable to find cpu cgroup in mounts
WARN[0001] Unable to find blkio cgroup in mounts
WARN[0001] Unable to find cpuset cgroup in mounts
WARN[0001] mountpoint for pids not found
Error starting daemon: Devices cgroup isn't mounted

Похоже, что ядро было собрано без поддержки cgroup, видимо, надо вручную включать в настройках ядра.

Спасибо, буду копать в эту сторону. А на сколько сложно заменить init с busybox на systemd?

О! ok3568 намекает...

busybox это набор традиционных утилит, он немного ортогонален systemd и, возможно, может использоваться вместе. Но для запуска докера это не должно быть принципиально