What is kubernetes

Kubernetes (commonly referred to as K8s) is an open source container orchestration platform for automated deployment, extension and management of container applications. It provides a set of powerful functions and tools, making it easier and more efficient to run container applications in large-scale distributed environments.

The core concept of Kubernetes is to package applications into one or more containers and deploy them to a cluster consisting of multiple physical or virtual machines. It is responsible for container lifecycle management, service discovery and load balancing, automatic capacity expansion, fault tolerance and self-healing.

Kubernetes provides rich functions, including:

1. Container orchestration: Kubernetes can automatically schedule and manage the deployment, scaling and update of containers according to the defined rules and policies.
2. Service discovery and load balancing: Kubernetes provides a built-in service discovery mechanism that enables containers to communicate by name and supports load balancing to distribute traffic.
3. Automatic scaling: Kubernetes can automatically scale or shrink horizontally according to resource utilization and application requirements to meet traffic and performance requirements.
4. Rolling update and rollback: Kubernetes supports application upgrade without downtime, and can gradually deploy the new version of the application to the cluster while maintaining the availability of the old version. If there is a problem, you can also quickly roll back to the previous stable version.
5. Failure recovery and self-healing: Kubernetes can monitor the health status of containers, and automatically recover and reschedule when containers or nodes fail.
6. Configuration and storage management: Kubernetes provides a flexible configuration management and storage management mechanism, which can easily manage the configuration files, keys, certificates and other information of applications, and supports multiple storage backend.

to make a long story short, Kubernetes is a powerful and flexible container orchestration platform, which makes it easier and more reliable to deploy, manage and extend container applications in a distributed environment. It has become one of the standard tools for cloud native application development and operation, and is widely used in enterprises and organizations of all sizes.