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JOSH WOOD OpenShift Developer Advocate Red Hat Kubernetes Operators

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Any application on any platform must be installed, configured, managed, and upgraded over time. Patching is critical to security Anything that isn’t automated is slowing you down. Operators are automated software managers for Kubernetes clusters: Install and Lifecycle. Why you care about Operators

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You find a killer new database, perfect match for your project’s requirements You don’t want to become an expert killernewDB DBA Operators make it easier to run foundation services You can use Operators today

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With the Operator Framework SDK https://github.com/operator-framework/operator-sdk You can build Operators today

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Scaling stateless apps: Easy

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ReplicaSet $ kubectl scale depl/staticweb --replicas=3

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ReplicaSet

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ReplicaSet

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What about apps that… store data?

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Creating a database is easy $ kubectl run db --image=quay.io/my/killernewdb

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Running a database is harder •Resize/Upgrade - coordination for availability •Reconfigure - tedious generation / templating •Backup - requires coordination among instances •Healing - restore backups, rejoin db cluster

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How? Extend Kubernetes If only Kubernetes knew…

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The goal $ cat database-cluster.yaml spec: clusterSize: 3 readReplicas: 2 version: v4.0.1 [...]

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Application-specific controllers that extend the Kubernetes API to create, configure, and manage instances of complex stateful applications on behalf of a Kubernetes user
 1. Extend the Kubernetes API through the Custom Resources (CR(D)) mechanism
 2. Custom controller to watch CRs, act in response What are Operators?

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Example: etcd Operator $ cat deployment.yaml spec: clusterSize: 3 version: v3.3.9 [...]

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etcd Operator

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Databases
 File, block, and object storage
 Applications with their own notion of “cluster”
 Apps for distribution on Kubernetes What are Operators good for?

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Use Operators today https://github.com/operator-framework/awesome-operators •Elastisearch •etcd •Prometheus •MySQL •Postgres (crunchy) •“and many more!”

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https://github.com/operator-framework/operator-sdk An Operator is a custom Kubernetes controller for your app. The SDK makes it easier to build Operators: • High level APIs and abstractions to write operational logic • Scaffolding and code generation to bootstrap new projects • Extensions to cover common Operator use cases Build your Operator

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Make your app a Kubernetes Native What are Operators good for?

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Resources • https://coreos.com/operators
 • Operator Framework and SDK on Github
 https://github.com/operator-framework/
 • Awesome Operators!
 https://github.com/operator-framework/awesome-operators
 • Introducing the Operator Framework
 https://coreos.com/blog/introducing-operator-framework
 • Make a Kubernetes Operator in 15 mins with Helm
 https://blog.openshift.com/make-a-kubernetes-operator-in-15-minutes-with-helm/
 • Kubernetes Custom Resources Grow up in v1.10.0
 https://blog.openshift.com/kubernetes-custom-resources-grow-up-in-v1-10/


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Questions? Comments? [email protected] @joshixisjosh9 Thank you!