CentOS7 安装docker

[root@promote ~]# yum install docker
Loaded plugins: fastestmirror
docker-main                                                                                                                                 | 2.9 kB  00:00:00     
Loading mirror speeds from cached hostfile
 * base: centos.ustc.edu.cn
 * extras: centos.ustc.edu.cn
 * updates: centos.ustc.edu.cn
Resolving Dependencies
--> Running transaction check
---> Package docker.x86_64 2:1.12.5-14.el7.centos will be installed
--> Finished Dependency Resolution

Dependencies Resolved

===================================================================================================================================================================
 Package                            Arch                               Version                                            Repository                          Size
===================================================================================================================================================================
Installing:
 docker                             x86_64                             2:1.12.5-14.el7.centos                             extras                              20 M

Transaction Summary
===================================================================================================================================================================
Install  1 Package

Total download size: 20 M
Installed size: 83 M
Is this ok [y/d/N]: y
Downloading packages:
docker-1.12.5-14.el7.centos.x86_64.rpm                                                                                                      |  20 MB  00:00:08     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : 2:docker-1.12.5-14.el7.centos.x86_64                                                                                                            1/1 
  Verifying  : 2:docker-1.12.5-14.el7.centos.x86_64                                                                                                            1/1 

Installed:
  docker.x86_64 2:1.12.5-14.el7.centos                                                                                                                             

Complete!

[root@promote ~]# systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[root@promote ~]# systemctl start docker
[root@promote ~]# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2017-02-02 08:30:05 CST; 4s ago
     Docs: http://docs.docker.com
 Main PID: 22641 (dockerd-current)
   CGroup: /system.slice/docker.service
           ├─22641 /usr/bin/dockerd-current --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current --default-runtime=docker-runc --exec-opt native.cg...
           └─22648 /usr/bin/docker-containerd-current -l unix:///var/run/docker/libcontainerd/docker-containerd.sock --shim docker-containerd-shim --metrics-int...

Feb 02 08:30:05 promote.cache-dns.local dockerd-current[22641]: time="2017-02-02T08:30:05.079964360+08:00" level=info msg="Graph migration to content-add...econds"
Feb 02 08:30:05 promote.cache-dns.local dockerd-current[22641]: time="2017-02-02T08:30:05.080718646+08:00" level=warning msg="mountpoint for pids not found"
Feb 02 08:30:05 promote.cache-dns.local dockerd-current[22641]: time="2017-02-02T08:30:05.081060264+08:00" level=info msg="Loading containers: start."
Feb 02 08:30:05 promote.cache-dns.local dockerd-current[22641]: time="2017-02-02T08:30:05.100128510+08:00" level=info msg="Firewalld running: true"
Feb 02 08:30:05 promote.cache-dns.local dockerd-current[22641]: time="2017-02-02T08:30:05.532830499+08:00" level=info msg="Default bridge (docker0) is as...ddress"
Feb 02 08:30:05 promote.cache-dns.local dockerd-current[22641]: time="2017-02-02T08:30:05.777223094+08:00" level=info msg="Loading containers: done."
Feb 02 08:30:05 promote.cache-dns.local dockerd-current[22641]: time="2017-02-02T08:30:05.777334646+08:00" level=info msg="Daemon has completed initialization"
Feb 02 08:30:05 promote.cache-dns.local dockerd-current[22641]: time="2017-02-02T08:30:05.777357242+08:00" level=info msg="Docker daemon" commit="047e51b...=1.12.5
Feb 02 08:30:05 promote.cache-dns.local dockerd-current[22641]: time="2017-02-02T08:30:05.795410780+08:00" level=info msg="API listen on /var/run/docker.sock"
Feb 02 08:30:05 promote.cache-dns.local systemd[1]: Started Docker Application Container Engine.
Hint: Some lines were ellipsized, use -l to show in full.

[root@promote ~]# docker run hello-world
Unable to find image ‘hello-world:latest‘ locally
Trying to pull repository docker.io/library/hello-world ... 
latest: Pulling from docker.io/library/hello-world

78445dd45222: Pull complete 
Digest: sha256:c5515758d4c5e1e838e9cd307f6c6a0d620b5e07e6f927b07d05f6d12a1ac8d7

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/