com /linux /ubuntu focal /stable amd64 Packagesĥ: 19.03. Make sure to install from the Docker repo instead of the the default Ubuntu repo:Ĭandidate: 5: 19.03. Update the package database with the Docker packages from the newly added repo: $ sudo add -apt -repository "deb focal stable" com /linux /ubuntu /gpg | sudo apt -key add. $ sudo apt install apt -transport -https ca -certificates curl software -properties -commonĪdd the GPS key for the official Docker repository to your system: Install a few prerequisite packages which let apt use packages over HTTPS: add the GPG key from Docker to ensure the downloads are valid.To ensure we get the latest version, we’ll install Docker from the official Docker repository. The Docker installation package available in the official Ubuntu repository may not be the latest version. I will show you how to install the Docker CE. There are two editions of Docker, a free community edition (CE) and a subscription based enterprise edition (EE). This is in contrast to virtual machines, which have to emulate a complete system, including CPU, disk, other hardware, kernel, etc. In other words, containers are built on a lightweight virtualization technology that allows an application, along with its dependencies and configuration to run in complete isolation, but without the need to use a full blown virtualization solution such as virtual machines, which need a lot more resources and can sometimes have a significant performance degradation in comparison to the host.Ī system configured as a container host can execute many containers, all of them sharing the host's kernel and direct access to the host's hardware. They’re similar to virtual machines, but containers are more portable, more resource-friendly, and more dependent on the host operating system. Containers let you run your applications in resource-isolated processes. Docker is an application that simplifies the process of managing application processes in containers.
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