PRACTICE WITH DOCKER

*Introduction*
This article will help you through docker configuration, downloading and building a container image.

*Prerequisites*

• You must have installed the VM ware Work Station Pro

• Downloaded and configured your Ubuntu Desktop.

*STEP ONE: Pasting URL*

• Open your broswer and paste the URL:https://docs.docker.com/engine/install/ubuntu/
  

• If copied correctly, you should be presented with the page as shown below.
  

*STEP TWO: Setting up Repository*

The next step is to set up the docker repository to enable you install and update docker from the repository.

• Copy and paste the following command on your terminal:
  *sudo su*
  The above command will require the password used in setting up the Ubuntu desktop. Once inputted, copy and paste the following commands accordingly:
  
  Your screen should appear like this
  

• Next, copy and paste the paste the command to add Docker official GPG Key

• Then, set up the repository with the code below

*STEP THREE:Install Docker Engine*

• First you will have to update the apt package index with the command below

• After sucessfully updating, we will go with installing the latest version of your docker engine.
  
  

• Next step is to verify the successful installation of your emgine by running the command below:
  
  

*STEP FOUR: Download a Container Image*

• Go to *https://hub.docker.com/*

• Click on Explore and search for Nginx

• On the left hand side of your screen, copy *docker pull nginx*
  

• Paste the copied command in your terminal and hit enter to download the container image in your local environment.
  

*STEP FIVE: Start a Container Image*

• On your terminal, run the command *docker run nginx --detach --publish-all nginx:latest*
  

• Run *docker ps* to display the port number
  

• Run *ip addr show* to get the ip address of your machine
  

• Copy your IP address and port number.

• Go to your browser and type: *ip address:port* You show see something like the picture below

*STEP SIX: Build a Container Image*

Follow the following steps to build the specified image.

• Create a directory and change to the directory created by running the following command. In this tutorial, our directory will be named *cloud*
  *mk dir cloud*
  *cd cloud*
  

• Create a linux text document called *Dockerfile* using the command *vim Dockerfile*
  If done correctly, your screen should appear like the one below

• Paste the following into the text editor. N/B You can only input anything into the text editor by pressing your "I" button
  *FROM* ubuntu****
  *MAINTAINER (your email address)*
  *CMD ['echo', 'hello world']*
  

• Press *esc, *shift + :, then type **wq**** to save your text
  

• Exit the text editor by pressing enter

• Build the container image using the following code
  *docker build -t (name of your choice) .*