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Containers, Clusters and Kubernetes - Brendan Burns - Defrag 2014
- 1. Containers, Clusters & Kubernetes Brendan Burns Staff Software Engineer
- 2. Motivations Make writing BigTable a CS 101 Exercise
- 3. What is acontainer? What is a container? ● Lightweight Linux environment ● Hermetically sealed, deployable application ● Introspectable, runnable artifact ● Recently popularized by Docker
- 4. What is acluster?
- 5. The transition tological compute VM Container Container Container Logical Compute Substrate Container Container Container Container Container Container Container Container Container Container Container Container Container Container Container VM VM VM VM VM VM VM VM VM
- 6. Modular Application Design VM Database Dependencies WebServer MiddleWare Database Container Dependency VM WebServer Container Dependency Middleware Container Dependency vs.
- 7. Modular Scaling VM Datab ase Depende ncies WebSer ver Middle Ware Database Container Dependency WebServer Container Dependency Middleware Container Dependency vs. VM Depende ncies WebSer ver Middle Ware Datab ase VM Depende ncies WebSer ver Middle Ware Datab ase Middleware Container Dependency WebServer Container Dependency VM VM WebServer Container Dependency
- 8. What is Kubernetes? ● Open source container cluster manager ● Inspired by the technology that drives Google ● Runs anywhere: ○ Public Cloud ○ Private Cloud ○ Bare Metal ● Strong ecosystem ○ Partners: Red Hat, VMWare, CoreOS, Microsoft, ... ○ Community: Client libs, integration, ...
- 9. The Cloud Dichotomy IaaS PaaS
- 10. A brief historyof programming languages Assembly Assembly PostScript
- 11. A brief historyof programming languages Assembly OAbsjseecmt Oblryiented Languages PostScript
- 12. The Cloud Dichotomy IaaS ICaaaaSS PaaS
- 13.
- 14. Components: Pods KubernetesPod Container-1 Container-2 Shared Volume(s)
- 15. Components: Sidecars KubernetesPod Serving Container Git Sync Container Shared Volume Git Repo Sidecars Extend and Enhance
- 16. Components: Adapters KubernetesPod Redis Service Redis Adapter Kubernetes Pod MongoDB Service MongoDB Adapter Kubernetes Pod MySQL Service MySQL Adapter Monitoring Service Adapters Normalize and Abstract
- 17. Components: Ambassadors KubernetesPod Frontend Container MySQL Ambassador Container Container Container Read Slaves Container Write Master localhost Ambassadors Proxy and Represent
- 18.
- 19. Abstractions, ftw! :Reliability {Container, Health Check} Kubernetes Container Web: http://<container>/some/path/to/health Shell: exec /some/path/health.sh TCP: open <container> <port>
- 20. Abstractions, ftw! :Replication {Template, Identifier, Num. Replicas} Replication Controller Container Container Container Container
- 21. Abstractions, ftw! :Services {IP:Port, Identifier, Name} Discoverable Service Container Container Container Container DNS Service IP Container
- 22.
- 23. Patterns and Interfaces:Master Election Lock Service Cluster Manager http://<container>/healthz Container Container Container Container
- 24. Patterns and Interfaces:Master Election Lock Service Cluster Manager http://.../master?master=container1 Container Container Container Container
- 25. Patterns: Sharded HTTPService http://foo.com/alpha http://foo.com/beta http://foo.com/gamma Kubernetes Service Container Container Container http://foo.com/alpha http://foo.com/beta http://foo.com/gamma
- 26. Patterns: Hot ShardedHTTP Service http://foo.com/alpha @ 20 qps http://foo.com/beta @ 5 qps http://foo.com/gamma @ 5 qps Kubernetes Service Container Container Container http://foo.com/alpha http://foo.com/beta http://foo.com/gamma http://foo.com/alpha
- 27. Patterns: Bigtable KubernetesService http://.../api/get?key=<key> http://.../api/set?key=<k>&val=<v> Container http://.../manage/shard/<shard>/split http://.../manage/shard/<shard>/merge http://.../manage/shard/<shard>/load http://.../manage/shard/<shard>/unload Data Interface Management Interface
- 28. We’re building anos for the datacenter. Join us! #google-containers on FreeNode https://github.com/GoogleCloudPlatform/kubernetes https://cloud.google.com/container-engine/
- 29.