Overview
Kubernetes (sometimes spelled k8s or "kube") is an open source container orchestration platform that automates many of the tedious tasks associated with deploying, managing, and growing containerized applications.
What can we do with Kubernetes?
The fundamental benefit of adopting Kubernetes in our environment, particularly if we are optimizing app development for the cloud, is that it provides a framework for scheduling and running containers on clusters of real or virtual machines (VMs).
More broadly, it enables us to fully adopt and rely on a container-based architecture in production scenarios. And, because Kubernetes is all about automating operational activities, we can perform many of the same things that other application platforms or management systems allow us to accomplish—but for our containers.
Developers may also use Kubernetes patterns to construct cloud-native apps with Kubernetes as a runtime platform. A Kubernetes developer needs patterns to design container-based apps and services.
We can do the following with Kubernetes:
- Containers may be orchestrated over several hosts.
- Improve your hardware usage to get the most out of the resources needed to run your business programs..
- Control and automate the deployment and updating of applications.
- Mount and add storage to run stateful applications.
- On-the-fly scaling of containerized apps and their resources.
- DMS, which ensures that deployed programs always execute as planned..
- With autoplacement, autorestart, autoreplication, and autoscaling, you can self-diagnose and repair your apps.
Kubernetes, on the other hand, is dependent on other projects to properly deliver these coordinated services.. With the addition of other opensource projects, we can fully realize the power of Kubernetes. These necessary pieces include (among others):
- Registry, through projects like Docker Registry.
- Security is provided through projects such as LDAP, SELinux, RBAC, and OAUTH with multilatency levels.
- Automation, with Ansible playbooks included for installation and cluster life cycle management.
- Services are provided through a large portfolio of common app templates.
Some frequent phrases:
The control plane is a group of programs that manage Kubernetes nodes. This is the source of all task assignments.
Nodes: These devices carry out the tasks given to them by the control plane.
Pod :A pod is a collection of one or more containers that are deployed to a single node. A pod's containers share an IP address, IPC, hostname, and other resources. Pods encapsulate network and storage from the underlying container. This allows you to transfer containers across the cluster more simply.
Replication controller: This defines how many identical copies of a pod should be running on the cluster.This determines how many identical copies of a pod should be operating on the cluster.
Service: This decouples job definitions from pods. Kubernetes service proxies route service requests to the correct pod, regardless of where it is in the cluster or if it has been replaced.
Kubelet: This service runs on nodes and reads container manifests to ensure that the specified containers are deployed and operational.
kubectl: The Kubernetes command line configuration tool.