Kubernetes Intro

简单介绍了Kubernetes的基本构架和概念,比如Pod,work nodes,master nodes等,当然也大概描述了Kubernetes可以自动帮我们横向扩展,服务发现,失败服务重启等等。可以作为快速概念了解读一遍本PPT
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1.Kubernetes Container Orchestration Mukta Aphale Founder & CEO (Crevise Technology) Pravin Magdum VP - Delivery ( Crevise Technology)

2.Who am I? VP-Deliver y @ Crevise 10 + years of development and solution architecture exp in various technology . Developer turned into Devops evangelist Transited from Windows -> Linux Container lover . Love debugging issues aka issue resolver.

3.K8s? What is this ? Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications. It groups containers that make up an application into logical units for easy management and discovery. In easy terms, It is Container Orchestration tool Supports multiple public cloud provider and bare metal environment

4.Kubernetes Features

5.Automatic binpacking Automatically places containers based on their resource requirements and other constraints, while not sacrificing availability. Mix critical and best-effort workloads in order to drive up utilization and save even more resources.

6.Horizontal scaling Scale your application up and down with a simple command, with a UI, or automatically based on CPU usage.

7.Horizontal scaling Scale your application up and down with a simple command, with a UI, or automatically based on CPU usage.

8.Storage orchestration Automatically mount the storage system of your choice, whether from local storage, a public cloud provider such as GCP or AWS , or a network storage system such as NFS, iSCSI, Gluster , Ceph , Cinder, or Flocker .

9.Storage orchestration Automatically mount the storage system of your choice, whether from local storage, a public cloud provider such as GCP or AWS , or a network storage system such as NFS, iSCSI, Gluster , Ceph , Cinder, or Flocker .

10.Service discovery and load balancing No need to modify your application to use an unfamiliar service discovery mechanism. Kubernetes gives containers their own IP addresses and a single DNS name for a set of containers, and can load-balance across them.

11.Secret and Configuration management Deploy and update secrets and application configuration without rebuilding your image and without exposing secrets in your stack configuration.

12.Architecture and Key Concepts

13.Architecture

14.Master Node The Kubernetes Master is a collection of three processes that run on a single node in your cluster, which is designated as the master node . R esponsible for maintaining the desired state for your cluster. M aster can also be replicated for availability and redundancy. Kube Api Server ETCD Kube Controller manager Kube scheduler

15.Worker Node The nodes in a cluster are the machines (VMs, physical servers etc ) that run your applications and cloud workflows. Kubelet Kube -proxy Container runtime engine - docker

16.Pods Basic building block of Kubernetes–the smallest and simplest unit in the Kubernetes object model that you create or deploy P resents a running process on your cluster. Group of containers would share storage, Linux namespaces, IP addresses. Co-located, hence share resources and are always scheduled together. Created, destroyed and re-created on demand, based on the state of the server and the service itself. “one-container-per-Pod” model is the most common Kubernetes use case

17.Deployments Level of abstraction above pods Define the desired scale and state of a group of pods To rollout a replicas Rollback to earlier version Scaling your pods /application Pause deployment

18.Deployment Example

19.Service s Kubernetes Pods are mortal. A Kubernetes Service is an abstraction which defines a logical set of Pods T he set of Pods targeted by a Service is determined by a Label Selector Define a DNS entry that can be used to refer to a group of pods Provide a consistent endpoint for the group of pods Similar in functionality to load balancers

20.Ingresses Define how traffic outside the cluster is routed to inside the cluster Used to expose Kubernetes services to the world Route traffic to internal services based on factors such as host and path

21.DEMO https:// github.com / PravinMagdum /k8s-guestbook

22.Thank You!  Reachable at – Pravin@crevise.com +91-9890312678