What is Kubernetes?
Kubernetes is an open source project that has become one of the most popular container orchestration tools; It allows you to deploy and manage applications from multiple containers to scale. While in practice the Kiscetes is most commonly used with Docker, the most popular containment platform, it can also work with any container system that meets the standards of the open content application (OPI) for formats and image execution times of container. And since Kubernetes is open source, with relatively few restrictions on how it can be used, it can be freely used by anyone who wants to run containers, anywhere they want to run them – on the spot, in the public cloud or both.
Components of Kubernetes
- Master Node : A control panel for the entire Kubernetes cluster. The master components can be run on any node in the cluster. The main components are:
- API server: The entry point for all REST commands, the only component of the master node that is accessible by the user.
- Scheduler: Look at the newly created pods and assign them to the knots. The implementation of pods and services in the nodes occurs due to the planner.
- Controller manager: Executes all controllers that handle routine tasks in the cluster.
- Worker nodes: Agent of the primary node, also called us miners. The pods are executed here. The worker nodes contain all the services necessary to manage the network between the containers, communicate with the main node and allocate resources to the plan containers.
- Docker: It runs on each node of the worker and downloads images and initiates containers.
- Kubernetes: It monitors the status of a pod and ensures that the containers are in operation. It also communicates with data storage, obtaining information about services and writing details about newly created ones.
- Kube-proxy: A network proxy and a load balancer for a service in a single work node. It is responsible for traffic routing.
- Kubectl: A CLI tool for users to communicate with the Kubernetes API server.
Kubernetes need and what can it do?
Containers are a good way to group and execute your applications. In a production environment, you must manage the containers running the applications and make sure there is no downtime. For example, if a container is inactive, the container must be restarted. Would not it be easier if that behavior were treated by a system? So Kubernetes comes to the rescue! Kubernetes provides a structure to execute distributed systems in a resilient way. It takes care of your scale requirements, failover, deployment patterns and much more. For example, Kubernetes can easily manage a Canarian implementation for your system.
Kubernetes provides you with:
Service discovery and load balancing
Kubernetes can expose a container using the DNS name or using its own IP address. If the traffic to a container is high, Kubernetes can balance the load and distribute the network traffic so that the implementation is stable.
Kubernetes allows you to automatically mount a storage system of your choice, such as local warehouses, public cloud providers and much more.
Automated rollouts and rollbacks
It can describe the desired state for containers implanted by Kubernetes and can change the actual state to the desired state at a controlled rate. For example, you can automate Kubernetes to create new containers for its implementation, remove existing containers and adopt all its resources for the new container.
Automatic bin packing
Kubernetes can make better decisions to manage resources for containers.
The Kubernetes reboots containers that fail, replaces containers, kills containers that do not respond to their health check defined by the user and does not advertise them to customers until they are ready for publication.
Secret and configuration management
Kubernetes allows you to store and manage confidential information, such as passwords, OAuth tokens and ssh keys. You can deploy and update secrets and application configurations without re-creating your container images and without exposing secrets in your stack configuration.
What can you do with Kubernetes?
The main advantage of using Kubernetes in your environment, especially if you are optimizing the development of applications for the cloud, is that it offers the platform to program and execute containers in clusters of physical or virtual machines. More broadly, it helps you implement and have a container-based infrastructure in production environments. And as Kubernetes has everything to do with the automation of operational tasks, you can do many of the same things that other application platforms or management systems allow, but for your containers.
- Use the hardware better to maximize the resources needed to run your corporate applications
- Control and automate implementations and application updates
- Mount and add storage to run applications with status
- Scale applications in a container
- Manage Declared services, which guarantees that the implemented applications always run as you have implemented.
- With the addition of other open source projects, you can fully sense the power of the Kubernetes. In the event that there is a change in the quality of the information, it must be taken into account that,
- Security, through projects such as LDAP, SELinux, RBAC and OAuth with multi-tension layers
- Automation, with the addition of playbooks Ansible for installation and cluster life cycle management
- Services, through a rich catalog of pre-created content from popular application patterns.