1. Kubernetes Container Orchestration
Mukta Aphale
Founder & CEO (Crevise Technology)
Pravin Magdum
VP - Delivery (Crevise Technology)

2. Who am I? VP-Delivery @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. Automated rollouts and rollbacks
Kubernetes progressively rolls out changes to your application or its configuration, while monitoring application health to ensure it doesn't kill all your instances at the same time. If something goes wrong, Kubernetes will rollback the change for you. Take advantage of a growing ecosystem of deployment solutions.

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. Self-healing Restarts containers that fail,
Replaces and reschedules containers when nodes die,
kills containers that don't respond to your user-defined health check

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.
Responsible for maintaining the desired state for your cluster.
Master 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
Presents 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. Services Kubernetes Pods are mortal.
A Kubernetes Service is an abstraction which defines a logical set of Pods
The 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. https://github.com/PravinMagdum/k8s-guestbook
DEMO

22. Reachable at – Pravin@crevise.com
Thank You! 
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