Ubuntu 14.04 安装 docker

在终端中运行以下命令即可：

sudo apt-get -y install 
  apt-transport-https 
  ca-certificates 
  curl

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository 
       "deb [arch=amd64] https://download.docker.com/linux/ubuntu  $(lsb_release -cs)  stable"

sudo apt-get update

sudo apt-get -y install docker-ce

sudo docker run hello-world

最后输出以下信息即安装成功：

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/

还可使用which docker来验证，得到结果示例：/usr/bin/docker

参考：https://store.docker.com/editions/community/docker-ce-server-ubuntu

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