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:
- The Docker client contacted the Docker daemon.
- The Docker daemon pulled the "hello-world" image from the Docker Hub.
- The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.- 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
