Docker CE install step in REH7

1.remove current docker Env:
[root@icp-master ~]# sudo yum remove docker \
docker-common \
docker-selinux \
docker-engine

2.Install required packages：

[root@icp-master ~]# yum install -y yum-utils device-mapper-persistent-data lvm2

3.set up the stable repository:

[root@icp-master ~]# yum-config-manager \    --add-repo \    https://download.docker.com/linux/centos/docker-ce.repo

4.Update the yum package index;

[root@icp-master ~]# yum makecache fast

5.Enable reh 7 ext rpms

[root@icp-master ~]#subscription-manager repos --enable=rhel-7-server-extras-rpms

6.install the latest version of Docker CE,

[root@icp-master ~]# yum install docker-ce

7.start docker

[root@icp-master ~]# systemctl start docker