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DevOps & Automation · Advanced

Operator

A Kubernetes extension that uses custom resources and a controller to automate the lifecycle of complex applications.

Definition

Operators encode operational knowledge (install, upgrade, backup, failover) for software like databases. The Operator Framework, Operator SDK, and OperatorHub support building and distributing them; OpenShift is built heavily on operators.

Example

Applying a PostgresCluster custom resource makes an operator deploy a replicated database with backups.

Exam tip

Operator = CRD + custom controller implementing domain-specific operations.

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