centos系统,执行docker build .命令报错,大家谁遇到过?

我是centos6.6的系统，镜像是centos6的系统，执行docker build .命令报错:[root@agent1 /]# docker build .
FATA[0000] Error checking context is accessible: 'no permission to read from 'proc/sys/net/ipv4/route/flush''. Please check permissions and try again.

报错的那个文件数组有w权限，属主和属组是root，我用root给他加权限却被拒绝了
root@agent1 route]# chmod a+r flush
chmod: changing permissions of `flush': Operation not permitted

lsattr flush -R 查看隐藏文件
[root@agent1 route]# lsattr flush -R
lsattr: Permission denied While reading flags on flush

也被拒绝了,大家谁遇到过?收起