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Automating Stateful Applications with Kubernetes Operators Jan Kleinert jan.kleinert@redhat.com February 6, 2019

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@jankleinert 2 Jan Kleinert Developer Advocate, Red Hat twitter/github: @jankleinert Hello!

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@jankleinert 3 What is Kubernetes?

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@jankleinert 4 Why should you care about operators?

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@jankleinert 5 Scaling stateless apps: easy

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@jankleinert 6 $ kubectl scale deploy/staticweb --replicas=3

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@jankleinert 7 scale up count=1 desired=3 ReplicaSet

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@jankleinert 8 start count=3 desired=3 ReplicaSet

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@jankleinert 9 What about apps that store data?

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@jankleinert 10 Creating a database is easy

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@jankleinert 11 $ kubectl run db --image=quay.io/my/db

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@jankleinert 12 Running a database over time is harder

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@jankleinert 13 ⏣ Resize/Upgrade ⏣ Reconfigure ⏣ Backup ⏣ Healing

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@jankleinert 14 Every application on any platform must be installed, configured, managed, and upgraded over time Patching is critical to security

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@jankleinert 15 Anything not automated is slowing you down

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@jankleinert 16 If only Kubernetes knew...

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@jankleinert 17

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@jankleinert 18

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@jankleinert 19 Operators are automated software managers that deal with installation and lifecycle of Kubernetes applications

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@jankleinert 20 1. Application-specific custom controllers 2. Custom resource definitions (CRD) Extending the Kubernetes API

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@jankleinert 21 Application-Specific Controllers

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@jankleinert 22 Custom Resource Definition (CRD) kind: ProductionReadyDatabase apiVersion: database.example.com/v1alpha1 metadata: name: my-production-ready-database spec: clusterSize: 3 readReplicas: 2 version: v4.0.1 [...]

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@jankleinert 23 { }

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@jankleinert 24 What is etcd? Example: etcd Operator ● distributed key-value store ● primary datastore of Kubernetes ● stores and replicates all Kubernetes cluster state

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@jankleinert 25 Example: etcd Operator kind: EtcdCluster apiVersion: etcd.database.coreos.com/v1beta2 metadata: name: example-etcd-cluster spec: size: 3 version: "3.1.0"

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@jankleinert 26 Example: etcd Operator

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@jankleinert 27

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@jankleinert 28 https://learn.openshift.com/operatorframework/ (or come by the OpenShift booth #601) Try It! Hands-On Operator Tutorials

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@jankleinert 29 https://github.com/operator-framework/awesome-operators ● etcd ● Prometheus ● Elasticsearch ● MySQL ● “and many more!” Use Operators Today

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@jankleinert 30 https://github.com/operator-framework

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@jankleinert 34 Operator SDK

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@jankleinert 35 https://github.com/operator-framework https://coreos.com/operators/ https://github.com/operator-framework/awesome-operators https://coreos.com/blog/introducing-operator-framework https://learn.openshift.com/operatorframework/ Resources

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THANK YOU plus.google.com/+RedHat linkedin.com/company/red-hat youtube.com/user/RedHatVideos facebook.com/redhatinc twitter.com/RedHat

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