Table of contents
- Day 30 Task: Kubernetes Architecture
- Kubernetes Overview
- Tasks
- 1. What is Kubernetes? Write in your own words and why do we call it k8s?
- 2. What are the benefits of using k8s?
- 3. Explain the architecture of Kubernetes
- The master node consists of:
- The worker node consists of:
- 4. What is Control Plane?
- 5. Write the difference between kubectl and kubelet.
- 6. Explain the role of the API server.
- Day 30 task is completed!
Day 30 Task: Kubernetes Architecture
Kubernetes Overview
With the widespread adoption of containers among organizations, Kubernetes, the container-centric management software, has become a standard to deploy and operate containerized applications and is one of the most important parts of DevOps.
Originally developed at Google and released as open-source in 2014. Kubernetes builds on 15 years of running Google's containerized workloads and the valuable contributions from the open-source community.
Tasks
1. What is Kubernetes? Write in your own words and why do we call it k8s?
Kubernetes is an open-source container orchestration platform for automating the deployment, scaling, and managing our containerized applications. It provides many features for managing our deployments amongst the remote servers that run containerized applications. Using it we can have a robust deployment structure over multiple envirinments.
We call it k8s because "Kubernetes" is a long name and it has 8 letters between "K" and "s". Therefore, we use "k8s" to refer to it more easily.
2. What are the benefits of using k8s?
Using Kubernetes you can build a robust sytem for your application/service deployments
Gives highavalability to our deployments as it supports multi-node deplyments.
Auto-healing and scaling of pods makes it robust system for deployment
It is open source, free and supports multi-cloud options.
It is flexible and portable as it supports different Container runtimes.
We can scale apps horizontally and vertically also we can upgrade resources
3. Explain the architecture of Kubernetes
- It has a unique architecture that consists of a master node and multiple worker nodes. The collection of two or more nodes forms a Kubernetes cluster.
- Master Node: The master node is also called as control plane which manages Kubernetes cluster.
The master node consists of:
API Server: The API server is the major component that communicates with all other components & provides an option to control cluster via Kubectl tool.
Scheduler: The scheduler allocates containers on worker nodes based on resource availability and other things.
Controller Manager: Watches over Kubernetes objects and other controllers and ensures that the desired state of the system is achieved and maintained.
etcd: It is key-value store that stores the configuration data and state of the Kubernetes cluster.
The worker node consists of:
Worker Nodes: The worker nodes are the nodes in the Kubernetes cluster that run the containerized applications.
Kube Proxy: It contans network rules on your nodes and enables network connections to pods.
Container Runtime: It helps to run and manage the containers on the worker node.
Kubelet: It manages and ensures that the containers are running, healthy, and have the necessary resources.
4. What is Control Plane?
The master node is also called as a Control Plane. It is the set of components for managing the state of the Kubernetes cluster.
The Control Plane makes global decisions about scheduling, scaling, and maintaining the desired state of the system.
It gives us the Kubernetes API, which is used to interact with the cluster and manage containerized applications.
5. Write the difference between kubectl and kubelet.
kubectl is a command-line tool that is used to interact with the Kubernetes API. It is used to create, update, delete, and view resources in the cluster.
kubelet is a component that runs on each node in the cluster and is responsible for managing the state of containers on that node. It communicates with the Control Plane to receive instructions about which containers to run and how to manage their state.
6. Explain the role of the API server.
The API Server is a component of the Kubernetes Control Plane that exposes the Kubernetes API.
It acts as the central control point for the Kubernetes cluster, receiving requests from us via kubectl and apply those requests on cluster.
The API Server is responsible for the authentication, authorization, and validation of all requests to the cluster.
It maintains the cluster's state in etcd and provides a view of that state to us.
Happy Learning :)
Day 30 task is completed!
90DaysOfDevOps Tasks👇