[root@localhost ~]# sudo tee /etc/yum.repos.d/docker.repo <<-'EOF'
> ;
> [dockerrepo]
> name=Docker Repository
> baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/
> enable=
> gpgcheck=
> gpgkey=https://yum.dockerproject.org/gpg
> EOF
;
[dockerrepo]
name=Docker Repository
baseurl=https://yum.dockerproject.org/repo/main/centos/$releasever/
enable=
gpgcheck=
gpgkey=https://yum.dockerproject.org/gpg
[root@localhost ~]# sudo yum install -y docker-engine
Loaded plugins: fastestmirror, refresh-packagekit, security
Setting up Install Process
Loading mirror speeds from cached hostfile
 * base: mirrors.tuna.tsinghua.edu.cn
 * extras: mirrors.njupt.edu.cn
 * updates: mirrors.tuna.tsinghua.edu.cn
dockerrepo                                               | :
dockerrepo/primary_db                                    | :
Resolving Dependencies
--> Running transaction check
---> Package docker-engine.x86_64 :-.el6 will be installed
--> Processing Dependency: libcgroup -.el6.x86_64
--> Running transaction check
---> Package libcgroup.x86_64 :.el6_10 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package            Arch        Version                   Repository       Size
================================================================================
Installing:
 docker-engine      x86_64      -.el6               dockerrepo      4.5 M
Installing for dependencies:
 libcgroup          x86_64      .el6_10        updates          k

Transaction Summary
================================================================================
Install        Package(s)

Total download size: 4.7 M
Installed size:  M
Downloading Packages:
(/): docker-engine--.el6.x86_64.rpm              | :
(/): libcgroup-.el6_10.x86_64.rpm           |  kB     :
--------------------------------------------------------------------------------
Total                                            kB/s | :
warning: rpmts_HdrFromFdno: Header V4 RSA/SHA1 Signature, key ID 2c52609d: NOKEY
Retrieving key from https://yum.dockerproject.org/gpg
Importing GPG key 0x2C52609D:
 Userid: "Docker Release Tool (releasedocker) <docker@docker.com>"
 From  : https://yum.dockerproject.org/gpg
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : libcgroup-.el6_10.x86_64                          /
  Installing : docker-engine--.el6.x86_64                             /
  Verifying  : docker-engine--.el6.x86_64                             /
  Verifying  : libcgroup-.el6_10.x86_64                          / 

Installed:
  docker-engine.x86_64 :-.el6                                            

Dependency Installed:
  libcgroup.x86_64 :.el6_10                                         

Complete!
[root@localhost ~]# 

[root@localhost ~]# docker -v
Docker version , build 786b29d