Devices cgroup isn't mounted

docker-cgroups.sh

# From: https://github.com/docker/docker/issues/8791
cgroupfs_mount() {
        # see also https://github.com/tianon/cgroupfs-mount/blob/master/cgroupfs-mount
        if grep -v '^#' /etc/fstab | grep -q cgroup \
                || [ ! -e /proc/cgroups ] \
                || [ ! -d /sys/fs/cgroup ]; then
                return
        fi
        if ! mountpoint -q /sys/fs/cgroup; then
                mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
        fi
        (
                cd /sys/fs/cgroup
                for sys in $(awk '!/^#/ { if ($4 == 1) print $1 }' /proc/cgroups); do
                        mkdir -p $sys
                        if ! mountpoint -q $sys; then
                                if ! mount -n -t cgroup -o $sys cgroup $sys; then
                                        rmdir $sys || true
                                fi
                        fi
                done
        )
}

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