Installation on Linux

To install Docker, we need to follow the steps given below.

Step 1 − Before installing Docker, you first have to ensure that you have the right Linux kernel version running. Docker is only designed to run on Linux kernel version 3.8 and higher. We can do this by running the following command.

uname

This method returns the system information about the Linux system.

Syntax

uname -a 

Options

a − This is used to ensure that the system information is returned.

Return Value

This method returns the following information on the Linux system −

  • kernel name
  • node name
  • kernel release
  • kernel version
  • machine
  • processor
  • hardware platform
  • operating system

Example

uname -a 

Output

When we run above command, we will get the following result −

Output

From the output, we can see that the Linux kernel version is 4.2.0-27 which is higher than version 3.8, so we are good to go.


Step 2 − You need to update the OS with the latest packages, which can be done via the following command −

apt-get 

This method installs packages from the Internet on to the Linux system.

Syntax

sudo apt-get update

Options

  • sudo − The sudo command is used to ensure that the command runs with root access.
  • update − The update option is used ensure that all packages are updated on the Linux system.

Example

sudo apt-get update 

Output

When we run the above command, we will get the following result −

Example Output

This command will connect to the internet and download the latest system packages for Ubuntu.


Step 3 − The next step is to install the necessary certificates that will be required to work with the Docker site later on to download the necessary Docker packages. It can be done with the following command.

sudo apt-get install apt-transport-https ca-certificates 
Necessary Docker Packages

Step 4 − The next step is to add the new GPG key. This key is required to ensure that all data is encrypted when downloading the necessary packages for Docker.

The following command will download the key with the ID 58118E89F3A912897C070ADBF76221572C52609D from the keyserverhkp://p80.pool.sks-keyservers.net:80 and adds it to the adv keychain. Please note that this particular key is required to download the necessary Docker packages.

sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D

Step 5 − Next, depending on the version of Ubuntu you have, you will need to add the relevant site to the docker.list for the apt package manager, so that it will be able to detect the Docker packages from the Docker site and download them accordingly.

Since our OS is Ubuntu 16.04, we will use the Repository name as “deb https://apt.dockerproject.org/repoubuntu-xenial main”.

And then, we will need to add this repository to the docker.list as mentioned above.

echo "deb https://apt.dockerproject.org/repo ubuntu-xenial main”     | sudo tee /etc/apt/sources.list.d/docker.list 

Step 6 − Next, we issue the apt-get update command to update the packages on the Ubuntu system.

APT-GET Update Command

Step 7 − If you want to verify that the package manager is pointing to the right repository, you can do it by issuing the apt-cache command.

apt-cache policy docker-engine 

In the output, you will get the link to https://apt.dockerproject.org/repo/

APT-GET Update Command

Step 8 − Issue the apt-get update command to ensure all the packages on the local system are up to date.

APT-GET Packages Updation

Step 9 − For Ubuntu Trusty, Wily, and Xenial, we have to install the linux-image-extra-* kernel packages, which allows one to use the aufs storage driver. This driver is used by the newer versions of Docker.

It can be done by using the following command.

sudo apt-get install linux-image-extra-$(uname -r) linux-image-extra-virtual 
Aufs Storage Driver

Step 10 − The final step is to install Docker and we can do this with the following command −

sudo apt-get install –y docker-engine 

Here, apt-get uses the install option to download the Docker-engine image from the Docker website and get Docker installed.

The Docker-engine is the official package from the Docker Corporation for Ubuntu-based systems.

Docker-engine

In the next section, we will see how to check for the version of Docker that was installed.

Docker Version

To see the version of Docker running, you can issue the following command −

Syntax

docker version  

Options

  • version − It is used to ensure the Docker command returns the Docker version installed.

Example

sudo docker version  

Output

When we run the above program, we will get the following result −

Docker Version Output

Docker Info

To see more information on the Docker running on the system, you can issue the following command −

Syntax

docker info 

Options

  • info − It is used to ensure that the Docker command returns the detailed information on the Docker service installed.

Example

sudo docker info

Output

When we run the above command, we will get the following result −

Docker Info Example Output

Installation on Windows

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