ubuntu 安装docker-ce

• Install using the repository

1. Update the apt package index:

$ sudo apt-get update

2. Install packages to allow apt to use a repository over HTTPS:

$ sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common

3. Add Docker’s official GPG key:

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

$ sudo apt-key fingerprint 0EBFCD88

4. Use the following command to set up the stable repository.

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

• INSTALL DOCKER CE

1. Update the apt package index.

$ sudo apt-get update

2. Install the latest version of Docker CE, or go to the next step to install a specific version. Any existing installation of Docker is replaced.

$ sudo apt-get install docker-ce

3. On production systems, you should install a specific version of Docker CE instead of always using the latest. This output is truncated. List the available versions.

$ apt-cache madison docker-ce
docker-ce | 17.12.0~ce-0~ubuntu | https://download.docker.com/linux/ubuntu xenial/stable amd64 Packages

The contents of the list depend upon which repositories are enabled. Choose a specific version to install. The second column is the version string. The third column is the repository name, which indicates which repository the package is from and by extension its stability level. To install a specific version, append the version string to the package name and separate them by an equals sign (=):

$ sudo apt-get install docker-ce=<VERSION>

The Docker daemon starts automatically.

4. Verify that Docker CE is installed correctly by running the hello-world image.

$ sudo docker run hello-world

This command downloads a test image and runs it in a container. When the container runs, it prints an informational message and exits.