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Kubernetes 101 for Developers
This document is an introductory presentation on Kubernetes, an open-source system designed for automating the deployment, scaling, and management of containerized applications. It outlines key concepts such as nodes, pods, deployments, and services, explaining their roles within a Kubernetes architecture. Additionally, it emphasizes the importance of container orchestration for managing application infrastructure effectively.
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Kubernetes 101 for Developers
- 1. D E CE M B E R 6 , 2 0 1 6 @RossKukulinski Kuberentes 101 for Developers Ross Kukulinski
- 2. © 2016 @RossKukulinski2 Welcome RossKukulinski Kubernetes/DevOps Consultant Node.js Evangelism WG / RethinkDB Community Introduction to CoreOS - O’Reilly Media @RossKukulinski on Twitter/GitHub
- 3. © 2016 @RossKukulinski Welcome 3 Today’sRoadmap • Introduction to Kubernetes • Ship to production Just kidding!
- 4. © 2016 @RossKukulinski ContainerOrchestration 4
- 5. © 2016 @RossKukulinski5 Ifyour architecture looks like this Manage your containers with Ansible, Docker Swarm, Amazon ECS, etc.
- 6. © 2016 @RossKukulinski6 Ifyour architecture looks like this You need orchestration help
- 7. © 2016 @RossKukulinski OrchestrationOverview 7 Container Orchestration • Schedule containers to physical/virtual machines • Restart containers if they stop • Provide private container network • Scale up and down • Service discovery
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- 9. © 2016 @RossKukulinski Kubernetes101 9 Kubernetes is an open source system for automating deployment, scaling, and management of containerized applications.
- 10. © 2016 @RossKukulinski Kubernetes101 10 Kubernetes Orchestration • Schedules containers to physical machines • Service discovery & load balancing • Horizontal application scaling • Automated rollouts & rollbacks • Secret and configuration management • Storage orchestration • … and a whole lot more!
- 11. © 2016 @RossKukulinski KubernetesTerminology 11
- 12. © 2016 @RossKukulinski Kubernetes101 12 Terminology - Node • Is a worker machine in Kubernetes that runs your containers • Node may be a VM or physical machine • Each Node has the services necessary to run Pods
- 13. © 2016 @RossKukulinski Kubernetes101 13 Terminology - Master • A special Node in Kubernetes that manages the cluster state • Usually does not run your containers • Runs necessary services to manage cluster , backed by etcd
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- 15. © 2016 @RossKukulinski Kubernetes101 15 Terminology - Namespaces • Provide a virtual cluster backed by the same physical cluster • Namespaces provide a scope for names. Names of resources need to be unique within a namespace, but not across namespaces. • Divide cluster resources between multiple uses • If not specified, you’re using the ‘default’ namespace
- 16. © 2016 @RossKukulinski Kubernetes101 16 Terminology - Pods • Smallest deployable unit of computing • Group of one or more containers • Containers within a Pod share a cluster-accessible IP address (and localhost) • Containers within a Pod of access to shared volumes
- 17. © 2016 @RossKukulinski Kubernetes101 17 Terminology - Replica Sets • Ensures that a specified number of Pod “replicas” are running at one time • If there are too many, it will kill some Pods • If there are too few, it will start more
- 18. © 2016 @RossKukulinski Kubernetes101 18 Terminology - Deployments • Provide declarative updates for Pods/Replica Sets • Manages one or more Replica Sets • Primary mechanism for interacting with Pods! • Automated rollouts and rollbacks :)
- 19. © 2016 @RossKukulinski Kubernetes101 19 Terminology - Services • An abstraction which defines a logical set of Pods • Provides a mechanism for accessing them • 3 types: ClusterIP, NodePort, LoadBalancer
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- 21. © 2016 @RossKukulinski21 DemoGods… we salute you!
- 22. © 2016 @RossKukulinski22 WorkshopResources github.com/rosskukulinski/ kubernetes-101-for-devs
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