如何检测docker版本信息呢?

实现思路:
    使用docker --version命令即可查看docker的版本信息
	 或使用
	   docker info命令--也可输出版本信息

[root@node0 ~]# docker --version
Docker version 1.13.1, build 7d71120/1.13.1
[root@node0 ~]# docker info
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
[root@node0 ~]# systemctl start docker
[root@node0 ~]# docker info
Containers: 1
 Running: 0
 Paused: 0
 Stopped: 1
Images: 70
Server Version: 1.13.1
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: journald
Cgroup Driver: systemd
Plugins: 
 Volume: local
 Network: bridge host macvlan null overlay
Swarm: inactive
Runtimes: docker-runc runc
Default Runtime: docker-runc
Init Binary: /usr/libexec/docker/docker-init-current
containerd version:  (expected: aa8187dbd3b7ad67d8e5e3a15115d3eef43a7ed1)
runc version: 8891bca22c049cd2dcf13ba2438c0bac8d7f3343 (expected: 9df8b306d01f59d3a8029be411de015b7304dd8f)
init version: fec3683b971d9c3ef73f284f176672c44b448662 (expected: 949e6facb77383876aeff8a6944dde66b3089574)
Security Options:
 seccomp
  WARNING: You're not using the default seccomp profile
  Profile: /etc/docker/seccomp.json
 selinux
Kernel Version: 3.10.0-1160.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
Number of Docker Hooks: 3
CPUs: 1
Total Memory: 3.682 GiB
Name: node0
ID: JFOA:O2RU:OERL:BPXE:3F2M:Y2DI:5SH5:ZVVQ:NT6X:GCO5:TEOZ:KN7Z
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled
Experimental: false
Insecure Registries:
 127.0.0.0/8
Registry Mirrors:
 https://*******.mirror.aliyuncs.com
Live Restore Enabled: false
Registries: docker.io (secure)
[root@node0 ~]# ^C
[root@node0 ~]#