Kubernetes otherwise K8s is a powerful system for managing application in a clustered environment. The containerised environment provides container-centric infrastructure. The main thing that differentiates Kubernetes from other container application is, it can deploy your application quickly and predictably. It optimises the use of hardware, scale the application on the fly and seamlessly roll out new features.
Features of Kubernetes:
- Automated binpack: Containers are placed based on the resource requirements and after considering other constraints.
- Self-healing: Failed, replaced and rescheduled containers get restarted when nodes dies. Also kills container that is not responding to user-defined health checks.
- Scaling: Application can be scaled automatically according to the CPU usage, with a simple command.
- Load balancing and Service discovery: Kubernet uses a single DNS name for a set of containers and gives containers their own IP addresses and load balancing can easily draw across them. To use an unfamiliar service discovery process, there is no need to modify your application.
- Rollouts and Rollbacks: Kubernete has the ability to rollback changes if an aggrandize state occurs, also it will rollout changes to your application and its configuration.
- Storage: It has the ability to mount the storage system for choices like local system, Network storage system or public cloud provider.
In other words, Kubernetes runs and schedules application level containers on clusters of physical or virtual machines. For developers, Kubernetes allows to cut the cord to physical and virtual machines and helps in moving to container-centric infrastructure from a host-centric infrastructure with complete advantages and benefits to inherent containers. Kubernetes maintains an infrastructure to build truly container-centric development environment.
Kubernetes satisfies the following needs of application running in production environment, such as co-locating helper processes, names and discovery, load balancing, rolling updates, replicating application instances, horizontal auto-scaling, identity and authorization, support for introspection & debugging, application health checking, distributing secrets, mounting storage systems, resource monitoring and log access with ingestion. These ensure portability across infrastructure providers and simplicity of Platform as a Services (Paas) with the flexibility of Infrastructure as a service (Iaas). Kubernetes have built-in essential features like service discovery, automatic load-balancing, container replication and more, which are powered via HTTP API.
Kubernetes works basically on two components master and Node server. Here the Master or control panel component is the controlling service of Kubernetes and the Node server component performs the work. They communicate with the master and run the actual workloads assigned to them.
Kubernetes is an exciting project that implements many interesting functional improvements on top of existing clustered infrastructure. When all other technologies concentrate on clustering aspects, Kubernetes concentrates on developing better management systems.