(我是Docker初学者.然后我关注了CentOS-7的一些教程)

在我的CentOS 7.2中,我尝试按照以下步骤学习Docker.

# docker version

Client:
 Version:      1.10.3
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   20f81dd
 Built:        Thu Mar 10 15:39:25 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.10.3
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   20f81dd
 Built:        Thu Mar 10 15:39:25 2016
 OS/Arch:      linux/amd64

# docker pull centos:latest
# docker images
centos     latest    778a53015523    12 days ago    196.7 MB

# mkdir ~/docker/centos7-systemd
# cd ~/docker/centos7-systemd
# vi Dockerfile
FROM centos
MAINTAINER "XXXX XXXX" 3015523    12 days ago    196.7 MB
local/centos7-systemd   latest    1a9f1c4938b3    8 seconds ago  196.7 MB

所以到目前为止,一切(似乎)都可以.
现在我跑的时候问题出现了：

# docker run -ti -v /sys/fs/cgroup:/sys/fs/cgroup:ro -p 80:80 local/centos7-systemd
Failed to mount tmpfs at /run: Operation not permitted
Failed to mount cgroup at /sys/fs/cgroup/systemd: Operation not permitted
[!!!!!!] Failed to mount API filesystems,freezing.

这甚至意味着什么,更重要的是,发生了什么,我该如何解决这个问题呢？

谢谢你们 ：)