Kubernetes 101 @tony0x01 #friyay 

The road so far... 

The Docker Ecosystem ● Docker Engine ● Docker CLI ● Kitematic ● Registry ● Docker Hub ● Docker Compose 

Orchestration Docker Swarm Kubernetes 

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What is K8s? “(It) is an open-source system for automating deployment, scaling, and management of containerized applications.” (https://kubernetes.io/) “Kubernetes is a powerful open-source system, initially developed by Google, for managing containerized applications in a clustered environment. It aims to provide better ways of managing related, distributed components and services across varied infrastructure.” (An Introduction to Kubernetes, by Digital Ocean) 

Kubernetes Objects 

Kubernetes Objects 1/3 It is a “record of intent”. Thru them, you defined the desired state of your cluster: ● which services are running and on which nodes ● resources available to the applications running ● policies of the behavior of these applications (restarts, upgrades, fault-tolerance) Once you create the Object, K8s will make sure what you desired to run is always running. source 

Kubernetes Objects 2/3 You create, modify or change Objects thru the K8s API. We use the kubectl CLI, which will talk to the API server for us. We describe an Object using Yaml. source 

Kubernetes Objects 3/3 An example Object. It’s a Deployment (we will see more about it soon). 

PODs 

POD 

POD POD ip: 170.1.10.101 nginx php-fpm 

Multiple PODs POD ip: 170.1.10.101 nginx php-fpm POD ip: 170.1.10.102 nginx php-fpm Internet 

Service source 

Services POD ip: 170.1.10.101 nginx php-fpm POD ip: 170.1.10.102 nginx php-fpm Internet 

Services POD ip: 170.1.10.101 nginx php-fpm POD ip: 170.1.10.102 nginx php-fpm Internet Service ip: 170.1.10.103 

Services POD ip: 170.1.10.101 label: name=webapp nginx php-fpm POD ip: 170.1.10.102 label: name=webapp nginx php-fpm Internet Service ip: 170.1.10.103 selector: name=webapp 

Services POD ip: 170.1.10.101 label: name=webapp nginx php-fpm Internet Service ip: 170.1.10.103 selector: name=webapp POD ip: 170.1.10.102 label: name=webapp nginx php-fpm POD ip: 170.1.10.104 label: name=webapp nginx php-fpm 

Services 

Services POD ip: 170.1.10.101 label: name=webapp nginx php-fpm Internet Service ip: 170.1.10.103 selector: name=webapp POD ip: 170.1.10.102 label: name=webapp nginx php-fpm POD ip: 170.1.10.104 label: name=webapp nginx php-fpm 

Services POD ip: 170.1.10.101 label: name=webapp nginx php-fpm Internet Service ip: 170.1.10.103 selector: name=webapp POD ip: 170.1.10.102 label: name=webapp nginx php-fpm POD ip: 170.1.10.104 label: name=webapp nginx php-fpm 

Services POD ip: 170.1.10.101 label: name=webapp nginx php-fpm Internet Service ip: 170.1.10.103 selector: name=webapp POD ip: 170.1.10.102 label: name=webapp nginx php-fpm POD ip: 170.1.10.104 label: name=webapp nginx php-fpm 

ReplicationControllers 

ReplicationControllers 

ReplicationControllers 

Deployments 

Deployments 

StatefulSet, Volumes and Claims 

Volumes and Claims 

StatefulSet, Volumes and Claims 

Demo time !!1!eleven! 

That’s it!