Kubernetes Operators: Managing complex software with software

FOSDEM '17, Université Libre du Bruxelles, Brussels, Belgium: https://fosdem.org/2017/

Transcript

1. Kubernetes Operators: Managing Complex Software with Software Josh Wood DocOps at CoreOS @joshixisjosh9
2. Overview Scaling Stateless Apps
3. $ kubectl scale replicas=3 ... ReplicaSet
4. ReplicaSet
5. ReplicaSet
7. Overview What about apps that…store data
8. $ kubectl run db --image=quay.io/my/db Creating a Database is Easy
9. • Resize/Upgrade - coordination for availability • Reconfigure - tedious generation / templating • Backup - requires coordination on instances • Healing - restore backups, rejoin Managing a Distributed Database is Harder
10. If only k8s knew...: Extend Kubernetes
11. $ cat my-db-cluster.yaml spec: clusterSize: 3 readReplicas: 2 version: v4.0.1 The Goal
12. Introducing Operators
15. etcd Overview • Distributed key-value store • Primary datastore of Kubernetes • Auto-leader election for availability
16. Operator Construction • Operators build on Kubernetes concepts • Resources: who what where ; desired state • Controllers: Observe, Analyze, Act to reconcile resources
17. Third Party Resources • TPRs extend the Kubernetes API with new API object types • Akin to a database table’s schema - the data model • Designed with custom automation mechanisms in mind • https://kubernetes.io/docs/user-guide/thirdpartyresources/
18. $ kubectl create -f https://coreos.com/operators/etcd/latest/deployment.yaml etcd Operator
19. $ cat deployment.yaml spec: clusterSize: 3 version: v3.1.0 etcd Operator Resource
20. etcd Operator
21. etcd Operator Open-source github.com/coreos/etcd-operator
22. Kubernetes self-hosting etcd Easy HA Setups on Kubernetes Automated backup to object store Chaos Monkey Testing for 1.0 etcd Operator - Future Work
23. Prometheus Operator • Operates Prometheus on k8s • Handles common tasks: ◦ Create/Destroy ◦ Monitor Configuration ◦ Services Targets via Labels • Configured by resources
26. Prometheus Operator Open-source github.com/coreos/prometheus-operator
27. • Read more at coreos.com/blog • Test and Extend the open source Operators • Build and Discuss other Operators (redis, postgres, MySQL) Next Steps
28. https://coreos.com/blog/introducing-operators.html https://coreos.com/blog/introducing-the-etcd-operator.html https://github.com/coreos/etcd-operator https://coreos.com/blog/the-prometheus-operator.html https://github.com/coreos/prometheus-operator https://github.com/kubernetes/minikube URLs
29. CoreOS runs the world’s containers We’re hiring: careers@coreos.com sales@coreos.com 90+ Projects on GitHub, 1,000+ Contributors coreos.com Support plans, training and more OPEN SOURCE ENTERPRISE
30. coreos.com/fest @coreosfest May 31 - June 1, 2017 San Francisco
31. j@coreos.com @joshixisjosh9 joshix.com QUESTIONS? Thanks! We’re hiring: coreos.com/careers Let’s talk! CoreOS-User google group More events: coreos.com/community LONGER CHAT?