1.挂载磁盘使用lvm格式的挂载，发现启动docker失败
2.查看日志 journalctl -xe
发现有个提示： failed to start daemon: Devices cgroup isn’t mounted

发现是cgroup没有挂载，于是参考一片文章挂载cgroup：https://blog.csdn.net/xinshuzhan/article/details/118293022

脚本如下：

cat mount_group.sh 
set -e   
# 这句是告诉bash如何有任何语句执行结果不为ture，就应该退出。 

if grep -v '^#' /etc/fstab | grep -q cgroup; then
	echo 'cgroups mounted from fstab, not mounting /sys/fs/cgroup'
	exit 0
fi

# kernel provides cgroups?
if [ ! -e /proc/cgroups ]; then
	exit 0
fi

# 确保目录存在
if [ ! -d /sys/fs/cgroup ]; then
	exit 0
fi

# mount /sys/fs/cgroup if not already done
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

# get/mount list of enabled cgroup controllers
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


exit 0

3.执行脚本如下：

sh mount_group.sh
mount: cgroup is already mounted or /sys/fs/cgroup/cpu,cpuacct busy
       cgroup is already mounted on /sys/fs/cgroup/systemd
       cgroup is already mounted on /sys/fs/cgroup/cpuset
rmdir: failed to remove ‘cpu’: Read-only file system
mount: cgroup is already mounted or /sys/fs/cgroup/cpu,cpuacct busy
       cgroup is already mounted on /sys/fs/cgroup/systemd
       cgroup is already mounted on /sys/fs/cgroup/cpuset
rmdir: failed to remove ‘cpuacct’: Read-only file system
mount: cgroup is already mounted or /sys/fs/cgroup/net_cls,net_prio busy
       cgroup is already mounted on /sys/fs/cgroup/systemd
       cgroup is already mounted on /sys/fs/cgroup/cpuset
       cgroup is already mounted on /sys/fs/cgroup/memory
       cgroup is already mounted on /sys/fs/cgroup/devices
       cgroup is already mounted on /sys/fs/cgroup/freezer
rmdir: failed to remove ‘net_cls’: Read-only file system
mount: cgroup is already mounted or /sys/fs/cgroup/net_cls,net_prio busy
       cgroup is already mounted on /sys/fs/cgroup/systemd
       cgroup is already mounted on /sys/fs/cgroup/cpuset
       cgroup is already mounted on /sys/fs/cgroup/memory
       cgroup is already mounted on /sys/fs/cgroup/devices
       cgroup is already mounted on /sys/fs/cgroup/freezer
       cgroup is already mounted on /sys/fs/cgroup/blkio
       cgroup is already mounted on /sys/fs/cgroup/perf_event
       cgroup is already mounted on /sys/fs/cgroup/hugetlb
       cgroup is already mounted on /sys/fs/cgroup/pids
rmdir: failed to remove ‘net_prio’: Read-only file system

4.尝试重启docker服务，成功