Kubernetes 101 for Developers

1. D E C E M B E R 6 , 2 0 1 6 @RossKukulinski Kuberentes 101 for Developers Ross Kukulinski

7. © 2016 @RossKukulinski Orchestration Overview 7 Container Orchestration • Schedule containers to physical/virtual machines • Restart containers if they stop • Provide private container network • Scale up and down • Service discovery

10. © 2016 @RossKukulinski Kubernetes 101 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!

12. © 2016 @RossKukulinski Kubernetes 101 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 Kubernetes 101 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

15. © 2016 @RossKukulinski Kubernetes 101 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 Kubernetes 101 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 Kubernetes 101 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 Kubernetes 101 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 Kubernetes 101 19 Terminology - Services • An abstraction which defines a logical set of Pods • Provides a mechanism for accessing them • 3 types: ClusterIP, NodePort, LoadBalancer

27. Thank you. Ross Kukulinski ross@kukulinski.com @rosskukulinski