Is docker a software?

Docker is a software that runs on Linux and Windows and is used to create, manage and arrange containers; the Docker platform is a software containerization platform and an open source application container engine that allows developers to Developers can package their applications and dependencies into a portable image or virtualize them without any interface between containers.

The operating environment of this tutorial: linux7.3 system, docker version 19.03, Dell G3 computer.

Is docker a software?

Docker is a software

Docker is a software that runs on Linux and Windows. For creating, managing, and orchestrating containers.

Docker is an open source application container engine that allows developers to package their applications and dependencies into a portable image and then publish it to any popular Linux or Windows operating system machine , virtualization can also be achieved. Containers completely use the sandbox mechanism and will not have any interfaces with each other.

Docker containers are similar to virtual machines, but they are different in principle. Containers virtualize the operating system layer, and virtual machines are virtualized hardware. Therefore, containers are more portable and use servers efficiently. Containers are used more to represent a standardized unit of software. Due to the standardization of containers, it can be deployed anywhere regardless of infrastructure differences. In addition, Docker also provides containers with stronger industry isolation compatibility.

The Docker platform is a software containerization platform, which means that we can build the application ourselves, package its dependencies together into a container, and then the container can be easily shipped to other machines for processing. Run, and very easy to load, copy, and remove, very suitable for software elastic architecture.

Why use Docker?

As an emerging virtualization method, Docker has many advantages compared with traditional virtualization methods.

First of all, Docker containers can be started in seconds, which is much faster than traditional virtual machine methods.

Secondly, Docker has a high utilization rate of system resources. Thousands of Docker containers can be run simultaneously on one host.

In addition to running the application in it, the container basically consumes no additional system resources, making the application performance very high and the system overhead as small as possible.

Traditional virtual machine method requires 10 virtual machines to run 10 different applications, while Docker only needs to start 10 isolated applications.

Specifically, Docker has great advantages in the following aspects.

1. Faster delivery and deployment

For development and operation and maintenance (devop) personnel, what they hope most is to create or configure once, which can be done at any time The place operates normally. Developers can use a standard image to build a set of development containers. After development is completed, operation and maintenance personnel can directly use this container to deploy code. Docker can quickly create containers, quickly iterate applications, and make the entire process visible, making it easier for other members of the team to understand how the application is created and works. Docker containers are light and fast!

The startup time of the container is seconds, which saves a lot of time in development, testing, and deployment.

2. More efficient virtualization

The running of Docker containers does not require additional hypervisor support. It is kernel-level virtualization, so it can achieve higher Performance and efficiency.

3. Easier migration and expansion

Docker containers can run on almost any platform, including physical machines, virtual machines, public clouds, private clouds, PCs, servers, etc. This compatibility allows users to directly migrate an application from one platform to another.

4. Simpler management

Using Docker, only small modifications are needed to replace a large amount of update work in the past. All modifications are distributed and updated incrementally, enabling automated and efficient management.

Comparing traditional virtual machines

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