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Before introducing Nebula Operator, you should know what the Operator is.

An Operator aims to package, deploy, and manage Kubernetes applications. By extending the functionality of the Kubernetes API, it creates, configures, and manages complex application instances on behalf of a user. It is built based on the Custom Resource Definition (CRD) and its associated Controller, covering domain or application-specific knowledge to automate the entire life cycle of the software it manages.

Source: DZone