记一次安装kolla遇到DockerException: Error while fetching server API version: Timeout value connect was Time...

1)环境信息：

docker版本：17.09，当docker的版本是12.06时，也会报这个错误

[root@localhost ~]# docker --version
Docker version 17.09.1-ce, build 19e2cf6
[root@localhost ~]#

kolla版本：ocata版本

[root@localhost kolla]# git branch -a
* stable/ocata
remotes/origin/HEAD -> origin/master
remotes/origin/master
remotes/origin/stable/ocata
remotes/origin/stable/pike
remotes/origin/stable/queens
remotes/origin/stable/rocky
[root@localhost kolla]#

2)问题现象

在执行kolla-build -b centos keystone命令时，提示如下错误

[root@localhost kolla]# kolla-build -b centos keystone
INFO:kolla.image.build:Found the docker image folder at /usr/sha