How To Install and Use Docker on Ubuntu 18.04

How To Install and Use Docker on Ubuntu 18.04

How To Install and Use Docker on Ubuntu 18.04

Introduction

Docker is an open-source containerization platform that allows you to create, deploy, and run applications in containers. Containers are lightweight, portable, and self-contained, which makes them an ideal choice for deploying applications in production environments.

Step 1: Update Your System

Before installing Docker on Ubuntu 18.04, you should update your system to ensure that all packages are up-to-date. To do this, open a terminal and run the following command:

sudo apt-get update

Enter your password when prompted.

Step 2: Install Docker

Next, you can install Docker on Ubuntu 18.04 by running the following command:

sudo apt-get install docker-ce

This command will install the latest version of Docker on your system.

Step 3: Verify the Installation

After installing Docker on Ubuntu 18.04, you can verify the installation by running the following command:

sudo docker run hello-world

If Docker is installed correctly, you should see a message that says "Hello from Docker!"

Step 4: Using Docker

Now that Docker is installed on your system, you can start using it to create and run containers. To create a container, you will need a Dockerfile. A Dockerfile is a text document that contains all the commands needed to build an image. Here is an example Dockerfile:

FROM ubuntu:18.04
RUN apt-get update && apt-get install -y apache2
CMD ["apache2ctl", "-D", "FOREGROUND"]

This Dockerfile will create a container that runs Apache web server.

To build an image from this Dockerfile, navigate to the directory that contains the Dockerfile and run the following command:

sudo docker build -t my-apache .

This command will build an image with the tag "my-apache".

To run a container from the image, run the following command:

sudo docker run -d -p 80:80 my-apache

This command will run a container in the background (-d) and map port 80 on the host to port 80 in the container (-p 80:80). You can now access the web server by opening a web browser and navigating to http://localhost.

Conclusion

Docker is a powerful tool for containerizing applications. By following these steps, you can install and use Docker on Ubuntu 18.04.

Keywords: Docker, Ubuntu, 18.04, install, tutorial, use, containerization, platform, open-source, lightweight

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