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Micro-datacenter chaos monkeys!
- 2. OVERVIEW ▸ Overview ▸ Background of Kubernetes ▸ k8s Concepts ▸ DEMO!!! (On a Pi cluster! —————————————————> ▸ Even More Demo ▸ More Demo ———————————————> ▸ Summary
- 4. KUBERNETES ▸ open-source platform for automating deployment, scaling, and operations of application containers ▸ Servers 2-N ▸ Open Sourced by Google 2014 ▸ github.com/kubernetes/kubernetes ▸ Written in Go ▸ #GIFEE (Google-like Infrastructure for Everyone Else)
- 5. GOOGLE EXPERIENCE ‣ Google has been using containers for over a decade ‣ 2 BILLON Per Week! (With a “B”) ‣ Everything at Google runs in a container
- 6. “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
- 9. APPLICATION CONTAINERS KUBERNETES CLUSTER OF MACHINES
- 10. HIGH LEVEL CONCEPTS ▸node ▸pod ▸scheduler ▸labels ▸deployments / replica set ▸services
- 11. ARCHITECTURE Master(s): Node(s): ETCD API SERVER CONTROLLER MANAGER KUBELET PROXYSCHEDULER CONTAINER ENGINE CADVISOR SOFTWARE DEFINED NETWORK ADDONS
- 12. NODE
- 13. NODE RESPONSIBILITIES 1.Runs containers ‣container engine (docker / rkt) ‣kubelet 2.Proxies service requests ‣kubeproxy
- 14. POD
- 15. REPRESENTS A LOGICAL APPLICATION CONTAINER CONTAINER ‣Shared ‣namespaces ‣volumes
- 17. SCHEDULER
- 18. SCHEDULES PODS TO RUN ON NODES ▸global ▸best fit chosen based on pod requirements ▸allows for over-commit ▸pluggable
- 19. LABELS
- 24. DESIRED STATE
- 26. CREATE PODS Desired: Actual: POD POD POD POD POD POD ACTION IS TO CREATE 3 PODS ——>
- 27. DELETE PODS Desired: Actual: POD POD POD POD ACTION IS TO DELETE 2 PODS ——>
- 28. HEALTH CHECK Desired: Actual: POD POD POD POD ACTION IS TO CREATE 2 PODS ——> POD POD
- 30. DEPLOYMENTS / REPLICA SETS
- 31. DEPLOYMENTS ▸Pod template ▸Docker image(s) ▸Labels ▸CPU / Memory ▸Replicas ▸Volume Mounts ▸Revisions ▸Strategy ▸Define in JSON || YAML
- 33. DEPLOYMENTS VOLUMES ▸ emptyDir ▸ hostPath ▸ gcePersistentDisk ▸ awsElasticBlockStore ▸ nfs ▸ persistentVolumeCla im ▸ flocker ▸ glusterfs ▸ rbd ▸ gitRepo ▸ secret ▸ iscsi
- 34. SERVICES
- 35. KUBERNETES SAMPLE NGINX NGINX LOAD BALANCER API API API API LOAD BALANCER NGINX DB LOAD BALANCER K8S SERVICE K8S SERVICE K8S SERVICE NGINX.NAMESPACE.SVC.K8S.LOCAL API.NAMESPACE.SVC.K8S.LOCAL DB.NAMESPACE.SVC.K8S.LOCAL
- 36. KUBERNETES PODS ARE MORTAL. THEY ARE BORN AND THEY DIE, AND THEY ARE NOT RESURRECTED.
- 37. SERVICE DISCOVERY FOR PODS ▸proxy runs on each node ▸virtual IP per service ▸dns address ▸[serviceName].[namespace].svc.k8s.local ▸dynamic “pods” based on label queries ▸pods are auto-injected with environment variables
- 40. SERVICE TYPES ▸ClusterIP: Internal to the cluster (SDN) ▸NodePort: Allocated port (range 30000-32767) ▸LoadBalancer: Provision loadbalancer on cloud provider
- 41. NAMESPACES
- 42. PARTITION RESOURCES ▸A mechanism to partition resources created by users into a logically named group ▸Allows for work to be done in isolation ▸Each namespace is given its own: 1.resources (pods, services, replication controllers, etc.) 2.policies (who can or cannot perform actions in their namespace) 3.constraints (this namespace is allowed this much quota, etc.)