docker 的安装

docker 的安装记录说明 ，应用于OS 7.0以下安装与验证
查看系统版本
$ cat /proc/issue
CentOS release 6.9 (Final)

１　docker安装 并看到响应：

$ yum -y install docker-io
Installing : lxc-libs-1.0.10-2.el6.x86_64 1/7
Installing : lua-filesystem-1.4.2-1.el6.x86_64 2/7
Installing : lua-lxc-1.0.10-2.el6.x86_64 3/7
Installing : libcgroup-0.40.rc1-23.el6.x86_64 4/7
Installing : lua-alt-getopt-0.7.0-1.el6.noarch 5/7
Installing : lxc-1.0.10-2.el6.x86_64 6/7
Installing : docker-io-1.7.1-2.el6.x86_64 7/7
Verifying : lua-lxc-1.0.10-2.el6.x86_64 1/7
Verifying : lxc-libs-1.0.10-2.el6.x86_64 2/7
Verifying : lxc-1.0.10-2.el6.x86_64 3/7
Verifying : docker-io-1.7.1-2.el6.x86_64 4/7
Verifying : lua-alt-getopt-0.7.0-1.el6.noarch 5/7
Verifying : libcgroup-0.40.rc1-23.el6.x86_64 6/7
Verifying : lua-filesystem-1.4.2-1.el6.x86_64 7/7
Installed:
docker-io.x86_64 0:1.7.1-2.el6
Dependency Installed:
libcgroup.x86_64 0:0.40.rc1-23.el6 lua-alt-getopt.noarch 0:0.7.0-1.el6 lua-filesystem.x86_64 0:1.4.2-1.el6 lua-lxc.x86_64 0:1.0.10-2.el6 lxc.x86_64 0:1.0.10-2.el6 lxc-libs.x86_64 0:1.0.10-2.el6

2 docker 服务启动 并响应：

$ service docker start
Starting cgconfig service: [ OK ]
Starting docker: [ OK ]

3　docker 安装验证，运行 hello-world 响应：

$ docker run hello-world
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/

4　docker 版本查看：

$ docker version
Client version: 1.7.1
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 786b29d/1.7.1
OS/Arch (client): linux/amd64
Server version: 1.7.1
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 786b29d/1.7.1
OS/Arch (server): linux/amd64

5　docker 信息查看：

$ docker info
Containers: 4
Images: 3
Storage Driver: devicemapper
Pool Name: docker-252:1-919642-pool
Pool Blocksize: 65.54 kB
Backing Filesystem: extfs
Data file: /dev/loop0
Metadata file: /dev/loop1
Data Space Used: 468.1 MB
Data Space Total: 107.4 GB
Data Space Available: 106.9 GB
Metadata Space Used: 1.081 MB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.146 GB
Udev Sync Supported: true
Deferred Removal Enabled: false
Data loop file: /var/lib/docker/devicemapper/devicemapper/data
Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.117-RHEL6 (2016-12-13)
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 2.6.32-573.22.1.el6.x86_64
Operating System: <unknown>
CPUs: 4
Total Memory: 7.688 GiB
Name: xxxxxxx
ID: xxxxx

参考：
https://docs.docker.com/engine/installation/linux/docker-ce/centos/#prerequisites