Kubernetes 101 Workshop

PyCon 2017 Neependra Khare, CloudYuga

Praveen Kumar, Red Hat

Container Orchestration Containers at Scale • Fault tolerance

• Scale on demand

• Use resources optimally

• Discover applications automatically, and have them communicate

• Securely acccess applications

• Update/rollback the applications without any downtime.

Container Orchestrators •

Docker Swarm

•

Kubernetes

•

Mesos Marathon

•

Amazon ECS

Container Orchestration General Concept - Container Runtime

Container Orchestration General Concept - Key/Value Store

Container Orchestration General Concept - Networking across the hosts

Container Orchestration General Concept - Scheduler

Container Orchestration General Concept - Service Discovery

Container Orchestration General Concept - Load Balancing

Container Orchestration General Concept - Access to external storage

Kubernetes Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications.

• Kubernetes features

• • • • • • • •

Automatic binpacking Self-healing Horizontal scaling Service discovery and load balancing Automated rollouts and rollbacks Secrets and configuration management Storage orchestration Batch execution

Kubernetes Architecture

http://blog.kubernetes.io

Kubernetes Installation •

Localhost

•

On-Premise

•

•

VMs

•

Bare-Metal

Cloud

•

Hosted

•

Turnkey

Setting up All-in-One Kubenetes - Minikube

•

Download Minikube

•

Start Minikube

Accessing the Cluster •

CLI

• •

GUI

• •

kubectl

Kubernetes Dashboard

APIs

Kubernetes Concept - Pod

C

C Volume

Kubernetes Concept - ReplicaSet ReplicaSet C

C

C

C

C

C

Current Pod Count == Desired Pod Count

Kubernetes Concept - ReplicaSet ReplicaSet C

C

C

C

C

C

Current Pod Count != Desired Pod Count

Kubernetes Concept - ReplicaSet ReplicaSet C

C

C

C

C

C

Current Pod Count == Desired Pod Count

C

C

Kubernetes Concept - Deployment

Deployment ReplicaSet C

C

Pod

C

C

Pod

C

C

Pod

Kubernetes Concept - Labels

CC

CC

app=fe env=dev

app=be env=dev

CC

CC

app=fe env=qa

app=be env=qa

Kubernetes Concept - Selectors env == dev CC

CC

app=fe env=dev

app=be env=dev

CC

CC

app=fe env=qa

app=be env=qa

app == fe

Kubernetes Concept - Services CC app=fe

CC

Service select (app==fe)

app=fe

CC app=fe

Kubernetes Concept - Services •

ServiceType

•

ClusterIP

•

NodePort

•

LoadBalancer

•

ExternalIP

Deploying a Standalone Application

Accessing the Application

•

Using NodePort ServiceType

•

Using LoadBalancer ServiceType

Deploying a multi-tier application Frontend

DB

Frontend

Frontend

DB

Frontend

Thanks