touch /etc/yum.repos.d/docker.repo

[docker-ce-stable]
name=Docker CE Stable - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/stable
enabled=1
gpgcheck=0 #我把这里设置成了0、说明我信任了这个源，不对它的rpm进行检察
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-stable-debuginfo]
name=Docker CE Stable - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/stable
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-stable-source]
name=Docker CE Stable - Sources
baseurl=https://download.docker.com/linux/centos/7/source/stable
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-edge]
name=Docker CE Edge - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/edge
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-edge-debuginfo]
name=Docker CE Edge - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/edge
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-edge-source]
name=Docker CE Edge - Sources
baseurl=https://download.docker.com/linux/centos/7/source/edge
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-test]
name=Docker CE Test - $basearch
baseurl=https://download.docker.com/linux/centos/7/$basearch/test
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-test-debuginfo]
name=Docker CE Test - Debuginfo $basearch
baseurl=https://download.docker.com/linux/centos/7/debug-$basearch/test
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

[docker-ce-test-source]
name=Docker CE Test - Sources
baseurl=https://download.docker.com/linux/centos/7/source/test
enabled=0
gpgcheck=1
gpgkey=https://download.docker.com/linux/centos/gpg

sudo yum install docker-ce
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package docker-ce.x86_64 0:17.03.1.ce-1.el7.centos will be installed
--> Processing Dependency: docker-ce-selinux >= 17.03.1.ce-1.el7.centos for package: docker-ce-17.03.1.ce-1.el7.centos.x86_64
--> Running transaction check
---> Package docker-ce-selinux.noarch 0:17.03.1.ce-1.el7.centos will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=====================================================================================================================================
 Package             Arch         Version                Repository            Size
=====================================================================================================================================
Installing:
 docker-ce            x86_64        17.03.1.ce-1.el7.centos        docker-ce-stable         19 M
Installing for dependencies:
 docker-ce-selinux        noarch        17.03.1.ce-1.el7.centos        docker-ce-stable         28 k

Transaction Summary
=====================================================================================================================================
Install 1 Package (+1 Dependent package)

Total download size: 19 M
Installed size: 19 M
Is this ok [y/d/N]: y

ll
total 19096
-rwxrwxrwx 1 jianglexing jianglexing 19521288 May 30 20:05 docker-ce-17.03.0.ce-1.el7.centos.x86_64.rpm
-rw-r--r-- 1 jianglexing jianglexing  29108 May 30 20:15 docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch.rpm
[root@workstudio docker]# yum localinstall *
Loaded plugins: fastestmirror, langpacks
Examining docker-ce-17.03.0.ce-1.el7.centos.x86_64.rpm: docker-ce-17.03.0.ce-1.el7.centos.x86_64
Marking docker-ce-17.03.0.ce-1.el7.centos.x86_64.rpm to be installed
Examining docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch.rpm: docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch
Marking docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package docker-ce.x86_64 0:17.03.0.ce-1.el7.centos will be installed
---> Package docker-ce-selinux.noarch 0:17.03.0.ce-1.el7.centos will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=====================================================================================================================================
 Package         Arch     Version             Repository                        Size
=====================================================================================================================================
Installing:
 docker-ce        x86_64    17.03.0.ce-1.el7.centos     /docker-ce-17.03.0.ce-1.el7.centos.x86_64        65 M
 docker-ce-selinux    noarch    17.03.0.ce-1.el7.centos     /docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch    43 k

Transaction Summary
=====================================================================================================================================
Install 2 Packages

Total size: 65 M
Installed size: 65 M
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
 Installing : docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch                                 1/2 
setsebool: SELinux is disabled.
libsemanage.semanage_direct_install_info: Overriding docker module at lower priority 100 with module at priority 400.
 Installing : docker-ce-17.03.0.ce-1.el7.centos.x86_64                                     2/2 
 Verifying : docker-ce-17.03.0.ce-1.el7.centos.x86_64                                     1/2 
 Verifying : docker-ce-selinux-17.03.0.ce-1.el7.centos.noarch                                 2/2 

Installed:
 docker-ce.x86_64 0:17.03.0.ce-1.el7.centos          docker-ce-selinux.noarch 0:17.03.0.ce-1.el7.centos          

Complete!

[root@workstudio docker]# systemctl start docker
[root@workstudio docker]# ps -ef | grep docker
root    4458   1 1 20:22 ?    00:00:00 /usr/bin/dockerd
root    4465  4458 0 20:22 ?    00:00:00 docker-containerd -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/run/docker/libcontainerd/containerd --shim docker-containerd-shim --runtime docker-runc
root    4589  4333 0 20:22 pts/1  00:00:00 grep --color=auto docker

[root@workstudio docker]# docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
78445dd45222: Pull complete 
Digest: sha256:c5515758d4c5e1e838e9cd307f6c6a0d620b5e07e6f927b07d05f6d12a1ac8d7
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
  executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
  to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://cloud.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/