Installing Docker

Hands-On Lab

 

Photo of Ell Marquez

Ell Marquez

Community Architect in Community

Length

00:30:00

Difficulty

Beginner

In this hands-on lab, we will practice installing Docker.

What are Hands-On Labs?

Hands-On Labs are scenario-based learning environments where learners can practice without consequences. Don't compromise a system or waste money on expensive downloads. Practice real-world skills without the real-world risk, no assembly required.

Installing Docker

Introduction

Your development team has asked for a cloud server with Docker installed. To meet this requirement you need to configure the Docker repository in your environment and create a new container called "Hello World" using the Centos:6 images.

Reminder: cat /etc/issue will tell you the host operating system.

Solution

  1. Begin by logging in to the lab server using the credentials provided on the hands-on lab page:

    ssh cloud_user@PUBLIC_IP_ADDRESS

Confirm Packages are Installed

  1. Install the packages:

    sudo yum install -y yum-utils lvm2 device-mapper-persistent-data
  2. Alternatively, if the packages are likely installed, the following command can be used to verify the installation without installing the package if one is missing. Each of these commands must be run and verified individually:

    rpm -qa |grep yum-utils
    
    rpm -qa |grep lvm2
    
    rpm -qa |grep device-mapper-persistent-data

Add the Repository

  1. Add the repository:

    sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
  2. Confirm the repository has been added by checking the repo directory:

    ls /etc/yum.repos.d/

Install Docker

  1. Install Docker:

    sudo yum install docker-ce

Enable and Start Docker

  1. Enable Docker:

    sudo systemctl enable docker
  2. Start Docker:

    sudo systemctl start docker

Add Your User to the Docker Group

  1. Add your user to the Docker group:

    sudo usermod -a -G docker cloud-user
  2. Verify the addition:

    grep docker /etc/group
  3. Log out of the system and back in to confirm the changes.

Create Your First Container

  1. Create the hello-world container:

    sudo docker run hello-world

Conclusion

Congratulations — you've completed this hands-on lab!