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Introduction to Microservices with Docker and Kubernetes
- 1. All Aboard the Buzzword Express (or - what are Docker and Kubernetes?) Dave Charles @cobecto
- 7. DDN
- 8. DDN DHS
- 9. DDN DHS DVCS
- 12. ?
- 15. Duh - This is just SOA?
- 16. Duh - This is just SOA?
- 17. Martin Fowler author, speaker, and loud-mouth on the design of enterprise software I've heard people say the nice thing about SOA is that it separates data from process, that it combines data and process, that it uses web standards, that it's independent of web standards, that it's asynchronous, that it's synchronous, that the synchronicity doesn't matter....
- 18. Adrian Cockcroft • A service-oriented architecture composed of loosely coupled elements that have bounded contexts
- 19. Eric Evans • Domain Driven Design. • A microservice with correctly bounded context is self-contained for the purposes of software development. • You can understand and update the microservice’s code without knowing anything about the internals of its peers
- 27. So what are the benefits
- 28. There must be down-sides?
- 29. Docker
- 30. Docker
- 34. • A HOST runs a DOCKER SERVER (agent running as a daemon) • Accessed using a DOCKER CLIENT • Tasks: • Builds IMAGES • Downloads IMAGES • Starts CONTAINERS • Stops CONTAINERS
- 35. Kubernetes K8s
- 36. API SERVER SCHEDULER CONTROLLER users control plane cluster NODE NODE NODE kubelet registry API CLIENT UI
- 37. API SERVER SCHEDULER CONTROLLER users control plane cluster NODE NODE NODE kubelet registry kubectl run nginx:v1
- 38. API SERVER SCHEDULER CONTROLLER users control plane cluster NODE NODE NODE kubelet registry kubectl run nginx:v1 status
- 39. API SERVER SCHEDULER CONTROLLER users control plane cluster NODE NODE NODE kubelet registry status status
- 40. API SERVER SCHEDULER CONTROLLER users control plane cluster NODE NODE NODE registry
- 41. • NAMESPACE • Provides multiple virtual clusters backed by the same physical cluster • “default” by, well, default Some Terminology
- 42. • POD • Encapsulate containers and volumes • Atomic unit of replication and placement • A logical host Some Terminology
- 43. • Volumes • Local scratch directories • Cloud block storage (GCE, AWS) • Cluster storage • Special – like Secrets, GIT repo Some Terminology
- 44. • Secrets • As per 12 factor App • Injected as a volume into a POD • Never touches disk Some Terminology
- 45. • Labels and Selectors • Labels are user defined key-value pairs than can be attached to any API object • These labels are query-able by SELECTORS Some Terminology
- 46. • Replication Controllers • Ensure n copies of a POD • Will drive current state towards desired state • If too few replicas, will create new ones • If too many, will destroy some • Used for scaling up, down and rolling updates Some Terminology
- 47. • Services • Targets group of pods with label selectors • Pods get their own IP, but they cannot be relied upon to be stable over time • Services provide a stable endpoint so that ephemeral pods can be found and accessed. Some Terminology
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