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What foundation does the Docker container need? Generally speaking, people stay at the conceptual level of Docker containers, but they have relatively little in-depth understanding and learning about Docker containers. Today I'm going to talk to you about the basics of Docker containers.

Docker is like a container with the applications you need. Docker uses Linux container technology internally and provides a complete file system and independent network environment.

The main difference between docker and vm virtual machine is that the vm virtual machine needs to set up resources, such as CPU, memory, hard disk, etc., before starting, which will take up some useless resources, and the vm virtual machine starts slowly. Docker is a process-level application that runs on the host, starts quickly, allocates system resources according to needs, and does not occupy useless resources like virtual machines. Docker containers are isolated from each other, and Docker has good mobility, so it is convenient for operators to migrate applications to other hosts without reconfiguring the environment, and docker has its own ecology, which has applications written by others, which can be pulled down directly. It can be used at startup. In short, docker is easy to use, and Docker includes three basic concepts:

Image (image) is equivalent to the installation package of software.

Container (container) is equivalent to software runtime running the applications you need in a container (the container is also equivalent to a linux system)

Repository (warehouse) is equivalent to the installation package above the application mall.

Docker is an open source project based on Linux container technology that uses Luinux kernel features such as namespaces and control groups to create containers on the operating system. Docker containers have four major advantages:

1) easy to use: Docker's mantra is: "build once, run everywhere." It makes it easier for anyone (developers, operators, architects, and others) to take advantage of containers to quickly build and test portable applications.

2) Speed: Docker containers are very lightweight and fast, because containers are just sandboxie environment running on the kernel, so they take up less resources. You can create a Docker container in seconds compared to a virtual machine that may take more time to create.

3) Docker Hub:Docker Hub has tens of thousands of community-built public images, all of which are available at any time. Docker users can benefit from the increasingly rich Docker Hub ecology and think of Docker Hub as a "Docker mirrored app store".

4) Modularity and extensibility: Docker allows you to easily split your application into a single separate container by function. Using Docker, it will be easier to link this container together to create your application, and individual components can be easily extended and updated in the future.

To get started with Docker container technology, you need to know about Docker container installation and startup, image operation, application deployment, backup and migration, etc. At the same time, Docker container technology is mostly combined with cloud computing, so it is wise to participate in professional cloud computing training courses if you want to learn Docker well and find a good job.

These are the details of the basics needed to learn Docker containers. Have you gained anything after reading them? If you want to know more about it, you are welcome to follow the industry information!

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