Installing Docker CE on Ubuntu

Before you install Docker CE (first time) on a new host machine, you need to set up the Docker repository. Afterward, you can install and update Docker from 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 -

4. Verify that you now have the key with the fingerprint 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88, by searching for the last 8 characters of the fingerprint.

$ sudo apt-key fingerprint 0EBFCD88

pub   4096R/0EBFCD88 2017-02-22

      Key fingerprint = 9DC8 5822 9FC7 DD38 854A  E2D8 8D81 803C 0EBF CD88

uid                  Docker Release (CE deb) <docker@docker.com>

sub   4096R/F273FCD8 2017-02-22

5. Use the following command to set up the stable repository. You always need the stable repository, even if you want to install builds from the edge or testing repositories as well. To add the edge or testing repository, add the word edge or testing (or both) after the word stable in the commands below.

Note: The lsb_release -cs sub-command below returns the name of your Ubuntu distribution, such as xenial. Sometimes, in a distribution like Linux Mint, you might have to change $(lsb_release -cs) to your parent Ubuntu distribution. For example, if you are using Linux Mint Rafaela, you could use trusty.sudo

amd64:

$ sudo add-apt-repository \

   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \

   $(lsb_release -cs) \

   stable"

NOTE: It will sources url to "sources.list" under /etc/apt repository.

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

or to install specific version use below command

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

The Docker daemon starts automatically.

3. 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.

Ref:

https://docs.docker.com/engine/installation/linux/docker-ce/ubuntu/#install-from-a-package