What does docker horizontal expansion mean?

With the development of cloud computing, container technology is becoming more and more important. And Docker is one of the most popular container technologies. Docker allows developers to easily create, deploy and run applications, so that those responsible for application development and maintenance can focus on business logic without paying attention to infrastructure issues. When our application needs to expand, Docker horizontal expansion will be used.

Horizontal expansion refers to expanding an application by adding multiple identical nodes. These nodes can run on the same host or be deployed on different hosts. When we need to expand, we can use container cluster management tools such as Docker Swarm or Kubernetes to manage multiple Docker containers and achieve horizontal expansion.

The implementation process of Docker horizontal expansion is different from that of Docker vertical expansion. Vertical expansion is to expand the application by increasing the resources of the host (such as CPU, RAM, etc.). However, this expansion has certain limitations, because once the limit of the physical host is reached, it cannot continue to expand. In contrast, horizontal scaling can solve this problem because the load can be evenly distributed among different nodes.

Docker Swarm is a container cluster management tool officially provided by Docker. It can manage multiple Docker nodes and achieve horizontal expansion of containers. Docker Swarm achieves Docker's high availability and load balancing by forming multiple Docker nodes into a cluster. When a node fails, Docker Swarm will automatically migrate the corresponding container to other nodes to ensure the availability of the application.

In addition to Docker Swarm, Kubernetes is also a popular container orchestration tool that can achieve horizontal expansion of multiple Docker containers. Kubernetes provides a large number of functions, such as automatic expansion, load balancing, fault recovery, etc., making container deployment and management easier.

In actual application scenarios, Docker horizontal expansion is a common solution, especially for large-scale applications. By using container cluster management tools such as Docker Swarm or Kubernetes, containers can be easily scaled out to improve application performance and availability.

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