Dockerd: failed to start daemon: Devices cgroup isn't mounted

Installing and Using OpenWrt
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I installed lxc today and docker stop working, the dockerman only have one 'configuration' submenu, EDIT: I try to try dockerd in cmdline, and got "failed to start daemon: Devices cgroup isn't mounted", seems like when I installed lxc cgroup got messed up
, anyone have seen problem like this?

cgroup on /sys/fs/cgroup type tmpfs (rw,relatime,mode=755)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,relatime,cpuset)
cgroup on /sys/fs/cgroup/cpu type cgroup (rw,relatime,cpu)
cgroup on /sys/fs/cgroup/cpuacct type cgroup (rw,relatime,cpuacct)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,relatime,blkio)
cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,relatime,net_cls)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,relatime,pids)
cgroup on /sys/fs/cgroup/rdma type cgroup (rw,relatime,rdma)
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solved:
I compiled my own openwrt, must got cgroups build in, when install lxc, cgroup related tools is installed, I remove cgroup-tools and cgroupfs-mount and docker is back.

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