@Po-Hsu, please check this again with linux-kvm 4.4.0-1020.25 (or later). That version enables additional cgroups, which may resolve the "dockerd[2991]: Error starting daemon: Devices cgroup ..." problem.
@Po-Hsu, please check this again with linux-kvm 4.4.0-1020.25 (or later). That version enables additional cgroups, which may resolve the "dockerd[2991]: Error starting daemon: Devices cgroup ..." problem.