Nugwc k8s session-16-march-2021
- 1. Introduction to Kubernetes For NUGWC - by Avanti Patil
- 2. Agenda Who am I? What is a container? What is docker? What is kubernetes? Self paced tutorial Questions Contact info
- 3. Who am I ? Avanti Patil Senior Software Engineer & Team Lead @Wayfair - Search Platform Founder and ex-president NUGWC Technologies I enjoy working with : Java, Kubernetes, Docker, Search engine (Solr , Elastic Search), Google GCP Contact details : Email : [email protected] Twitter : @ItsAvanti (I share technical content /memes) Linkedin : https://www.linkedin.com/in/avantipatil/
- 5. A container is a standard unit of software that packages up 1. code 2. all its dependencies Goal : 1. application runs quickly 2. reliably 3. Independent of computing environment e.g. (local, development,prod) What is Container?
- 6. Docker is a container management service. The keywords of Docker are develop, ship and run anywhere. - easily develop applications - ship them into containers - deployed anywhere. What is Docker?
- 7. Kubernetes Kubernetes is a Portable Extensible, Open-source platform for managing containerized workloads and services, facilitates both declarative configuration and automation. ● It has a large, rapidly growing ecosystem. ● Kubernetes services, support, and tools are widely available. ● The name Kubernetes originates from Greek, meaning helmsman or pilot. ● Kubernetes is also called as k8s.
- 8. ● Allows automated rollouts to create new containers. ● Allows automated rollbacks and adopt all their resources to the new containers. ● Self-healing : where k8s restarts containers that fail and wait till they become healthy to server new traffic. ● Service discovery and load balancing : based on your CPU and memory (RAM) limits for container k8s will can fit containers onto your nodes to make the best use of your resources. Why use Kubernetes? Or k8s? ● Secret management: Kubernetes lets you store and manage sensitive information, such as passwords, OAuth tokens, and SSH keys. ● Configuration management: You can deploy and update secrets and application configuration without rebuilding your container images, and without exposing secrets in your stack configuration. ● Storage orchestration: Kubernetes allows you to automatically mount a storage system of your choice eg. local or cloud provider.
- 10. Master node acts as a primary control pane for kubernetes. ● Kube Scheduler - runs a control loop/ state management for pod scheduling ● Kube API server - a component of the Kubernetes control plane that exposes the Kubernetes API. ● Controller manager - component that runs controller processes. Like node controller, job controller etc. ● etcd - Consistent and highly-available key value store used as Kubernetes' backing store for all cluster data. Kubernetes Architecture - Master node
- 11. Worker nodes are tasked with running workloads (pods) designated by Master node. ● kubelet - An agent that runs on each node in the cluster. It makes sure that containers are running in a Pod. ● kube proxy - kube-proxy is a network proxy that runs on each node in your cluster, implementing part of the Kubernetes Service concept. ● Container runtime - the software that is responsible for running containers. Kubernetes Architecture - Worker node
- 12. What is a pod? Pods are the smallest deployable units of computing that you can create and manage in Kubernetes. In terms of Docker concepts, a Pod is similar to a group of Docker containers with shared namespaces and shared file system volumes. Imp k8s command: Kubectl get pods A ReplicaSet is one of the Kubernetes controllers that makes sure we have a specified number of pod replicas running all the time. (Remember, a controller in Kubernetes is what takes care of tasks to make sure the desired state of the cluster matches the observed state.) However, a Deployment is a higher-level concept that manages ReplicaSets and provides declarative updates to Pods along with a lot of other useful features. Therefore, k8s recommends using Deployments instead of directly using ReplicaSets. What is a ReplicaSet & deployment?
- 13. Local k8s development options ● minikube: minikube quickly sets up a local Kubernetes cluster on macOS, Linux, and Windows. https://minikube.sigs.k8s.io/docs/ ● Docker with kubernetes: Setup a fully functional Kubernetes environment on your desktop with a single click and start developing and testing modern applications in minutes. https://www.docker.com/blog/docker-windows-desktop-now-kubernetes/
- 15. Kubernetes Questions ● How kubernetes works and automates deployment link ● Why is kubernetes useful - slide#8 ● What are the recent security issues with kubernetes - link ● I want to learn about Kubernetes - link ● Just a general outlook of its purpose in projects and extensibility. link ● What web hosting problems does it solve? ● How does search systems work using K8s? link ● How does Kubernetes support auto scaling? link
- 16. Questions for Avanti ● What a person needs to know apart industry prospective apart from the content in this workshop ● What are the basics of kubernetes which a security student needs to know link ● How do we start learning Kubernetes? Link. ● Is there any place to try hands on for kubernetes (demo)? use katakoda ● Full time opportunities at Wayfair - mostly senior roles link ● What is the future if cloud and Kubernotes technology professional? ● what other places are K8s used in Wayfair? ● What advice would you give to women who aspire to be in a leadership role? ● What KPIs do you use to measure your impact on the team and it’s strategy?
- 17. thank you Avanti Patil Contact details : Email : [email protected] Twitter : @ItsAvanti (I share technical content/memes) Linkedin : https://www.linkedin.com/in/avantipatil/