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This article mainly explains "what is a container". Friends who are interested might as well take a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn what a container is.

Containers are everywhere, and they have fundamentally changed the IT world. Containerization brings great value and a wide range of benefits to the enterprise, and almost all recent business innovations regard containerization as an important factor, even if it is not a core element.

In modern application architectures, the ability to quickly deliver changes to a production environment makes you stand out from your competitors. The container architecture, which increases speed through the use of a micro-service architecture, can help development teams create features, reduce failures, and speed up recovery.

Containerization also allows applications to start faster and automatically expand cloud resources as needed. In addition, DevOps maximizes the benefits of containerization by achieving the flexibility, portability, and efficiency required for early launch.

While speed, agility, and flexibility are the main promises of containerization with DevOps, security is a critical factor. This led to the rise of DevSecOps, which incorporated security into application development throughout the lifecycle of containerized applications from the very beginning. Containerization greatly improves security by default because it separates applications from hosts and other containerized applications.

What is a container?

Containers are the solution to problems inherited from monolithic architectures. Although monomers have their advantages, they prevent organizations from adopting agile approaches quickly. The container allows you to break down the whole into micro-services.

Essentially, a container is an application package of lightweight components, such as application dependencies, libraries, and configuration files, that run in a stand-alone or virtual environment on top of a traditional operating system to achieve simple portability and flexibility.

(Michael Calizo, CC BY-SA 4.0)

In summary, containers provide isolation by leveraging kernel technologies such as cgroup, kernel namespaces, and SELinux. Containers share kernels with hosts, which allows them to use fewer resources than virtual machines (VM).

The advantages of the second container

This architecture provides agility that virtual machines do not have. In addition, when it comes to computing and memory resources, containers support more flexible models that allow resource burst patterns so that applications can consume more resources within defined boundaries when needed. In other words, the container provides scalability and flexibility that cannot be achieved by running an application on VM.

Containers make it easy to share and deploy applications on public or private clouds. More importantly, they provide consistency and help operational and development teams reduce the complexity of multi-platform deployments.

The container also supports a common set of building blocks that can be reused at any stage of development, recreating the same environment for development, testing, delivery, and production, extending the concept of "write once, deploy anywhere." Compared to virtualization, containers are easier to achieve flexibility, consistency, and the ability to deploy applications faster-- this is the main principle of DevOps.

The factor of three Docker

Docker has become synonymous with containers. Docker revolutionized and popularized containers, even though the technology existed before Docker. Examples include AIX workload partitions, Solaris containers, and Linux containers (LXC), which are created to run multiple Linux environments in a single Linux host.

Four Kubernetes effect

Kubernetes is recognized as the leading choreography engine. Over the past few years, the popularity of Kubernetes and the growing maturity of containers have provided operators, developers, and security teams with ideal solutions to cope with changing situations.

Kubernetes provides an overall approach to managing containers. It can run containers across clusters, enabling functions such as automatic extension of cloud resources in an automatic and distributed manner, including event-driven application requirements. This ensures high availability "free" (that is, neither developers nor administrators put extra effort into implementing it). In addition, OpenShift and similar Kubernetes enterprise products make container adoption easier.

Will five containers replace virtual machines?

KubeVirt and similar open source projects demonstrate a great deal of commitment that containers will replace vm. KubeVirt introduces virtual machines into containerized workflows by converting virtual machines into containers, where virtual machines can run in containerized applications.

Currently, containers and vm are complementary solutions rather than competing technologies. Containers run on top of vm to improve availability, especially for applications that need persistence, and take advantage of virtualization technology to make it easier to manage the hardware infrastructure needed to support containers, such as storage and networking.

Six, what about the Windows container?

Microsoft and the open source community have strongly promoted the success of the Windows container. Kubernetes operators have quickly adopted Windows containers, and products like OpenShift now allow Windows worker nodes to run Windows containers.

Windows containerization creates many attractive possibilities, especially for enterprises with mixed environments. Being able to run the most critical applications on a Kubernetes cluster is a big advantage of implementing a hybrid or multi-cloud environment.

The future of the seven containers

Containers play an important role in the rapidly changing world of IT, as enterprises move towards delivering software and solutions quickly and quickly to surpass their competitors.

The container stays here. In the near future, there will be other use cases, such as edge serverless, that will further change our perception of the speed at which information is obtained from digital devices or from digital devices. The only way to deal with these changes is to adapt to them.

At this point, I believe that everyone has a deeper understanding of "what is a container", might as well come to the actual operation of it! Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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