“An operator is a way of building an application and driving an application on top of Kubernetes, behind Kubernetes APIs. The idea is that when you have an application, like a database like Postgres or Cassandra…any complex application needs a lot of domain-specific knowledge,” Sebastien Pahl, director of engineering, Red Hat OpenShift, explained in a Kubecon 2018 presentation. You can use Kubernetes tools to try and solve some of those problems, he notes.
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