For example: I run sudo docker run -it alpine and it drops me straight into the Alpine container, ready to work: Inside an Alpine container via Docker If you want to run an image as a container and get instant ‘interactive terminal’ shell access add the -it flag. To run a downloaded image you need to add the run subcommand and the name of the image, e.g., sudo docker run alpine. When you find the image you want to use you can download it using the pull subcommand, For example, to install Alpine Linux I run sudo docker pull alpine. When you run this command you’ll see a lengthy message informing you that the ‘installation appears to be working correctly’. From the command line run: sudo docker run hello-world This can be done using the hello-world app. Now that Docker is installed and running you should verify that everything is working okay. Step 2: Make Docker start automatically on system boot: sudo systemctl enable -now docker Ubuntu will download the latest version of Docker from its archives, unpack it, and install it on your system. Do this using the apt command and the docker.io package name (note: the package name is not simply ‘docker’): sudo apt install docker.io Step 1: Install Docker on Ubuntu from the Ubuntu repository. If you’re managing or setting up an Ubuntu server then you (probably) meet both of these requirements already, but do check before you begin. You need to be connected to the internet.There are two hard requirements to install Docker on Ubuntu 20.04: This is so you spend less time reading and more time doing. This tutorial is intentionally short and to the point. In this post you will learn how to install Docker from the regular Ubuntu repository, how to enable Docker to start automatically at system boot, and how to install Docker images and run them locally.īut this isn’t a deep dive. In this guide I cover installing Docker on Ubuntu 20.04 LTS (Focal Fossa), but the same steps may also work on older versions of Ubuntu, including Ubuntu 18.04 LTS. Because Docker is open source software it’s not only free to use, but free to adapt, extend, hack, or build on.
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