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Docker Installation

We can install docker on any operating system whether it is Mac, Windows, Linux or any cloud. Docker Engine runs natively on Linux distributions. Here, we are providing step by step process to install docker engine for Linux Ubuntu Xenial-16.04 [LTS].

Prerequisites:

Docker need two important installation requirements:

• It only works on a 64-bit Linux installation.
• It requires Linux kernel version 3.10 or higher.

To check your current kernel version, open a terminal and type uname -r command to display your kernel version:

Command:

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Update apt sources

Follow following instructions to update apt sources.

1. Open a terminal window.
2. Login as a root user by using sudo command.
3. Update package information and install CA certificates.

Command:

$ apt-get update $ apt-get install apt-transport-https ca-certificates

See, the attached screen shot below.



4. Add the new GPG key. Following command downloads the key.

Command:

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

Screen shot is given below.



5. Run the following command, it will substitute the entry for your operating system for the file.
$ echo “<REPO>” | sudo tee /etc/apt/sources.list.d/docker.list

See, the attached screen shot below.



6. Open the file /etc/apt/sources.list.d/docker.listand paste the following line into the file.
deb https://apt.dockerproject.org/repo ubuntu-xenial main



7. Now again update your apt packages index.
$ sudo atp-get update



See, the attached screen shot below.

8. Verify that APT is pulling from the right repository.
$ apt-cache policy docker-engine

See, the attached screen shot below.



9. Install the recommended packages.
$ sudo apt-get install linux-image-extra-$(uname -r) linux-image-extra-virtual

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Install the latest Docker version.

1. update your apt packages index.
$ sudo apt-get update

See, the attached screen shot below.



2. Install docker-engine.
$ sudo apt-get install docker-engine

See, the attached screen shot below.



3. Start the docker daemon.
$ sudo service docker start

See, the attached screen shot below.



4. Verify that docker is installed correctly by running the hello-world image.
$ sudo docker run hello-world

See, the attached screen shot below.



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

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