What dependencies does docker need?

Docker is a popular containerization technology that allows developers to easily create, deploy and run a variety of applications. However, to package an application as a Docker image and run it in a Docker container, some dependencies are required to ensure the proper functioning of Docker. In this article, we will explore what dependencies Docker requires and how to install them for your Docker environment.

1. Containerization technology

Before discussing the dependencies of Docker, let’s first understand what containerization technology is. Containerization is a technology that packages applications into independent, portable containers. In a container, the application and its dependencies are contained in the container's file system and have all the libraries and binaries needed to access those dependencies. This allows containers to run in almost any environment without worrying about environment settings or version conflicts for applications. Docker leverages containerization technology to make packaging, deploying, and running applications simpler and more efficient.

2. Docker dependencies

Although Docker is an independent application and does not require too many dependencies, you still need to pay attention to the following when installing and using Docker Dependencies:

2.1 Linux Kernel

Docker is built on the Linux kernel. Therefore, you first need to install a Linux kernel that supports Docker, such as Ubuntu, Debian, CentOS, Fedora, etc. If you are using a non-Linux operating system such as Windows or MacOS, consider using Docker for Windows or Docker for Mac, which have a virtual machine on which you can run a Linux Docker environment.

2.2 Docker engine

The Docker engine is the most important part of the Docker architecture. It provides the core functions of managing images and containers for the Docker environment. Before installing Docker, you need to ensure that the Docker engine is installed on your computer. The Docker engine supports various installation methods in various operating systems, including apt, yum, Homebrew, custom binaries, etc.

2.3 Containers and Images

Before running a Docker container, you need a Docker image. A Docker image is a packaging of an application and its dependencies, and is the basis for creating containers. Docker images can be obtained from Docker Hub or other Docker image hosting services.

2.4 Docker Compose

Docker Compose is a tool for managing multiple containers in the Docker environment. Use Docker Compose to simplify the deployment and management of multi-container applications. Docker Compose can define collections of containers through YAML files and start, stop, and delete these containers through a single command. Docker Compose can be installed through pip or the official Docker Compose website.

3. Installing Docker dependencies

If you have decided to use Docker to manage your applications, here are the steps to install Docker:

On Linux Installing Docker on

First, you need to confirm that the appropriate system and version of the Linux kernel have been installed. Then, you need to uninstall earlier forms of Docker (such as Docker.io) and complete the following steps:

1. Update using apt-get:

sudo apt-get update

2. Install Docker engine:

sudo apt-get install docker-ce

Install Docker on MacOS

When installing Docker on MacOS, you need to install Homebrew first , a package manager that can be used to install Unix tools. Then, you need to run the following command to install Docker:

1. Update using Homebrew:

brew update

2. Install Docker:

brew install docker

Installing Docker on Windows

Installing Docker on Windows requires Docker for Windows. Docker for Windows is an application that can run a Linux Docker environment on a Windows operating system. Before using Docker for Windows, you need to ensure that the Windows Containers feature is enabled on Windows 10 Pro or Enterprise. You can then download and install Docker for Windows from Docker’s official website.

Under normal circumstances, Docker has few dependencies, but before installing Docker, you need to ensure that the appropriate Linux kernel and Docker engine are installed, and that the images and Docker Compose to be used are prepared. The use of Docker allows developers to easily create, deploy and run various applications. Although installation may be cumbersome for beginners depending on the size of the software, use after installation can not only improve work efficiency but also improve Quality of software development.

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