Kubernetes

Scrum 03/02/2015

1. Kubernetes: 
 Managing Containers the Google way
2. Why Containers*? 1. Packaging
 2. Efficiency and Speed
 3. Security (?) (*) Container = Docker flavor container
3. Static application environment No stress deployment and update Repeatable portable artifact Develop here, run there Pick your cloud solely on its merits Loosely coupled = easier to build and manage Easier to build and manage Compose applications from micro-services Packaging
4. Everything at Google runs in a container. • Resource isolation
 • Predictability
 • Quality of service
 • Efficient overcommit
 • Resource accounting Google starts over 2 billion containers per week. Images by Connie Zhou Efficiency
5. Docker " 15000+ GitHub stars " 600+ contributors " 100's of projects built on top of Docker ◦ UIs, mini-PaaS, … ◦ github.com/google/cadvisor ◦ github.com/GoogleCloudPlatform/heapster " Very popular GitHub project ◦ Most popular Go project of all time ◦ $  docker  run  -­‐i  -­‐t  ubuntu  /bin/bash  -­‐p  80:80
6. Kubernetes κυβερνήτης: Greek for “pilot” or “helmsman of a ship” the open source cluster manager from Google
7. Kubernetes • Employs and promotes Docker • Simple, portable, extensible modular framework for container-based service app management • Patterned after internal systems in Google that manage internet-scale workloads • Written in Go github.com/GoogleCloudPlatform/kubernetes
8. Node Container Manager Scheduled Containers Managed Base OS Managed Base OS Node Container Manager Scheduled Containers Cluster Scheduler Simplified Cluster Management Stack Scheduled Containers
9. Managed Base OS kubelet Scheduled Containers Managed Base OS kubelet + Docker Kubernetes Master
 etcd Kubernetes Container Stack Scheduled Containers Scheduled Containers
10. Kubernetes glossary - Master: the managing machine, which oversees one or more minions. - Minion: a slave that runs tasks as delegated by the user and Kubernetes master. - Pod: an application that runs on a minion. - Replication controller: Verifies everything that should be running is running. - Label: an arbitrary key/value pair that the Replication Controller uses for service discovery - kubecfg: the config tool - Service: an amalgamation of similar pods
11. Kubernetes Master/Scheduler Kubernetes Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent MINIONS
12. Log Roller Web Server Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Kubernetes Master/Scheduler Pods
13. FE FE FE FE FE FE BE BE BE BE BE BE BE BE BE Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Kubernetes - Master/Scheduler Too Many Pods
14. labels: role: frontend FE FE FE FE FE FE BE BE BE BE BE BE BE BE BE Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Kubernetes - Master/Scheduler Labels
15. labels: role: frontend stage: production Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Kubernetes - Master/Scheduler FE FE FE FE FE FE BE BE BE BE BE BE BE BE BE Labels
16. FE FE FE FE replicas: 4 template: ... labels: role: frontend stage: production Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Kubernetes - Master/Scheduler Replication Controller
17. FE replicas: 1 template: ... labels: role: frontend stage: production Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Kubernetes - Master/Scheduler Replication Controller
18. FE FE FE replicas: 3 template: ... labels: role: frontend stage: production Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Machine Host Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Container Agent Kubernetes - Master/Scheduler Replication Controller
19. Clone Kubernetes at: github.com/GoogleCloudPlatform/kubernetes IRC: #google-containers on Freenode 
 Google group: google-containers Kubernetes on GCE (new!): https://cloud.google.com/ compute/docs/containers