Application Orchestration with Kubernetes

Transcript

1. Application Orchestration with Kubernetes
2. About Me Software Engineer / Architect
3. Kubernetes ◦ open-source platform for automating deployment, scaling, and operations of application containers ◦ Servers 2-N
4. “helmsman of a ship” • lean: lightweight, simple, accessible • extensible: modular, pluggable, hookable, composable, toolable • portable: public, private, hybrid, multi cloud • self-healing: auto-placement, auto-restart, auto- replication
5. DB01 WEB02 DWIGHT PAM
6. Application Containers Cluster of Machines Kubernetes
7. High level concepts ◦ node ◦ pod ◦ scheduler ◦ labels ◦ replication controller ◦ service
8. Node
9. 1. Runs containers 2. Proxies service requests ◦ container engine (docker / rkt) ◦ kubelet ◦ proxy
10. POD
11. Container B Container A Represents a logical application • Shared ◦ namespaces ◦ volumes
12. Pod Example: REST API (Container) Logger (Container) Logs
13. Scheduler
14. Schedules pods to run on nodes ◦ global scheduler ◦ best fit chosen based on pod requirements ◦ pluggable
15. Labels
16. Labels Example: frontend production backend production frontend staging steve staging
17. type=frontend frontend production backend production frontend staging steve staging
18. env=production frontend production backend production frontend staging steve staging
19. type=steve frontend production backend production frontend staging steve staging
20. Desired State / Controller
21. Create Pods Desired: Actual: POD POD POD POD POD POD
22. Delete Pods Desired: Actual: POD POD POD POD
23. Health Check Desired: Actual: POD POD POD POD POD POD
24. Replication Controller
25. Replication Controller ◦ Pod Template ◦ Docker image(s) ◦ Labels ◦ CPU / Memory ◦ Replicas
26. Services
27. Service discovery for pods ◦ proxy runs on each node ◦ virtual IP per service / dns address ◦ dynamic “pods” based on label queries
29. backend-service (4.5.6.7) selector=backend db-service (7.8.9.10) selector=db frontend-service (1.2.3.4) selector=frontend frontend frontend frontend backend backend backend db
31. Brendan Burns (Google) @brendandburns Kelsey Hightower (CoreOS) @kelseyhightower
32. @stevesloka steve@stevesloka.com Thank you!